EWAN_Practice_Final_Exam CCNA4-模拟期末考试-试题及答案
计算机四级模考试题(含参考答案)
计算机四级模考试题（含参考答案）一、单选题（共63题，每题1分，共63分）1.高级数据链路协议HDLC采用的帧同步方法是（）。
A、字符填充的首尾定界符法B、违法编码法C、比特填充的首尾标志法D、字节计数法正确答案：C2.按照网络的交换方式划分的网络类型中不包括（）。
A、虚拟交换网B、电路交换网C、报文交换网D、分组交换网正确答案：A3.可解决VPN安全性的技术不包括（）。
A、认证技术B、加密技术C、隧道技术D、防火墙技术正确答案：D4.下列关于星形拓扑特点的描述中错误的是（）。
A、中央节点负担较重，形成瓶颈B、通常采用分布式通信控制策略C、故障诊断和隔离容易D、控制简单且方便服务正确答案：B5.防火墙中网络地址转换（MAT）的主要作用是（）。
A、提供代理服务B、隐藏内部网络地址C、进行入侵检测D、防止病毒入侵正确答案：B6.不仅能发现差错而且能自动纠错的差错控制方式是（）。
A、ARQB、FECC、DESD、CRC正确答案：B7.采用虚电路分组交换方式时，可以省去的阶段是（）。
A、建立物理连接B、建立逻辑连接C、结束本次连接D、传输数据正确答案：D8.IPv6把IP地址长度增加到了（）。
A、256比特B、64比特C、128比特D、32比特正确答案：C9.IEEE802.1l规定的无线局域网操作的波段是（）。
A、4.8GHZB、2.4GHZC、5.0GHZD、1.2GHZ正确答案：B10.停火区(DemilitArizeDZone，简称DMZ)，也称非军事化区，是一个位于可信的内部网络和不可信的外部网络(如互联网)之间的计算机或者小的子网。
采用DMZ的防火墙部署方式是目前一个比较流行和正确的做法。
防火墙环境下各种应用服务器的放置不必遵守以下哪种原则（）。
A、通过边界路由过滤设备保护外部网络可访问的服务器，或者将它们放置在外部DM中B、绝不可将外部网络可访问的服务器放置在内部保护网络中C、根据外部服务器的敏感程度和访问方式，将它们放置在内部防火墙之后D、尽量隔离各种服务器，防止一个服务器被攻破后危及其他服务器的安全正确答案：C11.你想发现到达目标网络需要经过哪些路由器，你应该使用什么命令（）？A、pingB、nslookupC、trACertD、ipConfig正确答案：C12.SMTP是（）协议。
CCNA四考试答案
第1章考试1一家拥有10 名员工的小型公司使用单个LAN 在计算机之间共享信息。
哪种类型的连接适合此公司？由当地电话服务提供商提供的拨号连接能够使公司方便且安全地连接员工的虚拟专用网络通过当地服务提供商建立的私有专用线路通过当地服务提供商提供的宽带服务（如DSL）答案：4解析：对于这种小型办公室，比较适合通过被称为数字用户线路(DSL) 的常见宽带服务实现Internet 连接，这种服务由当地的电话服务提供商提供。
由于员工人数很少，带宽的问题并不突出。
如果公司较大，在远程站点有分支机构，则专用线路会更加适合。
如果公司员工需要通过Internet 与公司联系，则采用虚拟专用网。
2哪种网络情况需要使用WAN？员工工作站需要获取动态分配的IP 地址。
员工在出差时需要通过VPN 连接到公司电子邮件服务器。
分支机构的员工需要与同一园区网络上的另一座建筑物内的公司总部共享文件。
员工需要访问托管在其建筑物内DMZ 中的公司Web 服务器上的网页。
答案：2解析：当出差的员工需要通过WAN 连接到公司电子邮件服务器时，VPN 将通过WAN 连接在员工笔记本电脑与公司网络之间创建一个安全隧道。
通过DHCP 获取动态IP 地址是LAN 通信的功能。
在企业园区的不同建筑物之间共享文件可通过LAN 基础设施来实现。
DMZ 是企业LAN 基础设施内一个受保护的网络。
3以下哪项描述了WAN 的特征？WAN 和LAN 在同一地理范围内运行，但有串行链路。
WAN 网络归运营商所有。
所有串行链路均被视为WAN 连接。
WAN 可提供到园区主干网的终端用户网络连接。
答案：2解析：WAN 可用于将企业LAN 互连到远程分支机构站点LAN 和远程工作人员站点。
WAN 归运营商所有。
虽然WAN 连接一般通过串行接口实现，但并不是所有串行链路均连接至WAN。
LAN（而非WAN）可在组织中提供终端用户网络连接。
4电路交换WAN 技术的两个常见类型是什么？（请选择两项。
计算机四级网络工程师模拟试题+答案
计算机四级网络工程师模拟试题+答案一、单选题（共82题，每题1分，共82分）1.关于XMPP的描述中，正确的是( )。
A、采用局部寻址方案B、采用FTP思想设计C、比SIMPLE的扩展性强D、核心为UML协议正确答案：C2.操作系统中，把逻辑地址转换成绝对地址的工作称为( )。
A、编译B、运行C、重定位D、链接正确答案：C3.关于Maze认证机制的描述中，正确的是( )。
A、采用集中式认证B、参考Kerberos机制C、需要CA服务器D、访问心跳服务器时需传输用户密码正确答案：B4.关于网络协议的描述中，错误的是( )。
A、语法是对事件的实现顺序的说明B、组织方式经常采用层次结构模型C、为网络数据交换制订的规则与标准D、由语法、语义与时序三个要素组成正确答案：A5.系统调用与一般过程调用是不同的，下列对调用程序与被调用程序的描述中，哪一个是正确的( )。
A、过程调用和系统调用的调用程序与被调用程序均位于核心态B、过程调用和系统调用的调用程序与被调用程序均位于用户态C、过程调用时通过改变状态字，从用户态的调用程序转到核心态的被调用程序D、系统调用时需要通过陷入机制，从用户态的调用程序转到核心态的被调用程序正确答案：D6.关于IEEE802参考模型的描述中，正确的是( )。
A、对应TCP/IP参考模型的传输层B、对应OSI参考模型的表示层C、主要关注局域网的标准化D、应用层是其中的重要层次正确答案：C7.关于IEEE802.11帧的描述中，正确的是( )。
A、与传统Ethernet帧的结构相同B、帧类型分为数据帧与管理帧两种C、地址字段使用的都是MAC地址D、数据字段的最大长度为1500字节正确答案：C8.关于万兆以太网的描述中，正确的是( )。
A、仅支持双绞线作为传输介质B、协议标准是IEEE802.3aeC、最大传输速率是100GbpsD、支持全双工与半双工方式正确答案：B9.进程并发执行时，若两个并发进程包含同一共享变量，则它们存在下列哪一种关系( )。
南昌商学院《CCNA四》课程期末考试试卷.doc
南昌商学院-《CCNA四》课程期末考试试卷(A卷)适用专业计科02级考试所需时间120试卷总分100考试日期11月21日开卷/闭卷闭卷成绩一、选择题(共40题，每题2分)1> Which of the following devices can an administrator use to segment their LAN? (Choose all that apply)A. HubsB. Repeaters C・ Switches D. BridgesE. RoutersF. Media ConvertersG. All of the above2> Within the TestKing office, The Sales and Production networks are separated by a router as shown in the diagram below:Sales Productionof the following statements most accurately describes the characteristics of the above networks broadcast and collision domains? (Select the two best answer choices)A. There are two broadcast domains in the network・B. There are four broadcast domains in the network.C. There are six broadcast domains in the network.D. There are four collision domains in the network.E. There are five collision domains in the network.F. There are seven collision domains in the network.3> Which of the following are benefits of segmenting a network with a router? (Select all that apply)A. Broadcasts are not forwarded across the router.B. All broadcasts are completely eliminmted.C. Adding a router to the network decreases latency.D. Filtering can occur based on Layer 3 information.E. Routers are more efficient than switches and will process the data more quickly.F. None of the above.4> If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs?A. 172.16.45.0B. 172.16.45.4C. 172.16.45.8D. 172.16.45.12E. 172.16.45.18 5> The subnet mask on the serial interface of a router is expressed in binary as 11111000 for the last octet> How do you express the binary number 11111000 in decimal?A. 210B. 224C.240D. 248E. 2526N Y OU have a Class C network, and you need ten subnets* You wish to have as many addresses available for hosts as possible* Which one of the following subnet masks should you use?A. 255.255.255.192B. 255.255.255.224C. 255.255.255.240D. 255.255.255.248E. None of the above7> Which of the following is an example of a valid unicast host IP address?A. 172.31.128.255./18B. 255.255.255.255C. 192.168.24.59/30D. FFFF.FFFF.FFFFE. 224.1.5.2F. All of the above8> The TestKing network was assigned the Class C network 199J66J3L0 from the ISP. If theadministrator at TestKing were to subnet this class C network using the 255.255.255.224 subnet mask, how may hosts will they be able to support on each subnet?A. 14B. 16C. 30D. 329> The 213.115.77.0 network wassubnetted using a /28 subnet mask*How many usable subnets and host addresses per subnet were created as a result of this? A. 2 networks with 62 hostsC. 16 networks and 16 hostsE. 14 networks and 14 hosts10> The Testking network is shown in the diagram below:E. 62F. 64B. 6 networks with 30 hostsD. 62 networks and 2 hostsF. None of the abovethis diagram, OSPF is used as the routing protocol between the corporate office and the offices on the left side of the diagram. An ISDN link provides connectivity from the central corporate router to the remote salesoffice on the right side of the diagram* Which type of route should the corporate office use to reach the router on the right side of the diagram if the overhead on the ISDN link is to be kept to a minimum?A. A RIP routeC. A static routeE. A dynamic route 11> You are a network administrator and you need to implement a routing protocol on your network that provides:* Scalability* VLSM support* Minimal overhead* Support for connecting networks using routers of multiple vendors Which of the following routing protocol would best serve your needs?A. VTPB. RIP version 1C. EIGRPD. OSPFE. IGRPF. CDP12> You need to configure a single router into load balancing traffic across 4 unequal cost paths. Which routing protocols can satisfy this requirement? (Select two)A. RIP v1B. RIP v2C. IGRPB. An OSPF route D. A default routeF. None of the aboveISPD. EIGRPE. OSPFF. ISIS13、Which of the following routing protocols do NOT support VLSM (variable length subnet masking)? (Choose all that apply).A. RIPvlB. IGRPC. EIGRPD. OSPFE. ISISF. RIPv214、You work as a network engineer at ・ You are required to allow establishment of a Telnet session with a router TestKingC・Which set command must be configured?A. TestKingC(c on fig)# line con sole 0TestKingC(configline)#enable password testkingB. TestKingC(c on fig)# line console 0TestKingC(configline)#enable secret testkingTestKingC(configline)#loginC. TestKi ngC(c on fig)# line console 0T estKingC(configline)#password testkingTestKingC(configli ne)#loginD. TestKingC(config)# line vty 0TestKingC(configline)#enable password testkingE. TestKingC(config)# line vty 0TestKingC(configline)#enable secret testkingTestKi ngCjconfigli nej#logi nF. TestKingC(config)# line vty 0TestKingC(configline)#password testkingTestKingC(c on figline)#login15、The Testking University network is shown below:BBQ gQStudent Networki j | 172.16.62.0/24 Libraryserver172.16.63.252/24 the above network, an access list was created in order to prevent students and outsiders on the internet from changing student files in the Records Server, while still allowing other departments in the enterprise access. The access control list was applied to the eO interface of the TestKing 3 router going outbound* Which two of the following conditions below were contained in the access control list? (Select two answer choices)A. permit 172.16.64.254 0.0.0.0 172.16.0.0 0.0.255.255B. permit 172.16.0.0 0.0.255.255 172.16.64.254 0.0.0.0C. deny 172.16.64.254 0.0.0.0 172.16.62.0 0.0.0.255D. deny 172.16.62.0 0.0.0.255 172.16.64.254 0.0.0.0E. deny 172.16.64.254 0.0.0.0 anyF. permit any any16N Which one of the access control list statements below will deny all telnet connections to subnet 10.10.L0/24?A. accesslist 15 deny telnet any 10.10.1.0 0.0.0.255 eq 23B. accesslist 115 deny udp any 10.10.1.0 eq telnetC. accesslist 15 deny tcp 10.10.1.0 255.255.255.0 eq telnetD. accesslist 115 deny tcp any 10.10.1.0 0.0.0.255 eq 23E. accesslist 15 deny udp any 10.10.1.0 255.255.255.0 eq 2317> The Testking Corporation consists of the head office in New York with its regional offices in: Chicago, Detroit, Philadelphia, Toronto, and Atlanta. These offices need to be connected in a WAN, and Testking wishes to do this via a hub and spoke arrangement that will utilize packetswitched technology.Which one of the WAN technologies below would be the best choice for Testking?s berver 172.16.64.254/24A. ISDNB. WirelessC. Frame Relay18.The Testking network is implementing dialup services for their remote employeeSe Testking uses several different Layer 3 protocols on the network. Authentication of the users connecting to the network is required for security. Additionally, some employees will be dialing long distance and will need callback suppor仁Which protocol is the best choice for these remote access services?A. 802.1B. Frame relayC. HDLCD. PPPE. SLIPF. PAP19. A Cisco router has been configured with the following command:IP nat pool nattest 192.168.6.10 192.168.6.20 netmask 255.255.255.0 This is an example of what type of NAT?A. Static NATB. Dynamic NATC. Dynamic NAT with overloadD. Port Address TranslationE. None of the above20> Which of the following technologies can be used in distance vector routing protocols to prevent routing loops? (Select all valid answer choices) A. Spanning Tree Protocol B. Shortest path first treeC. Linkstate advertisements (LSA)D. Holddown timersE. Split horizonF. VRRP21* What is the reason for configuring a passive interface on a router? (Select only one answer)A. Allows in terfaces to share comm on IP addresses.B. Allows an interface to remain up without the aid of keepalives・C. Allows a router to send routing and not receive updates via that in terface.D. Allows a routing protocol to forward updates that is missing its IP address.E. Allows a router to receive routi ng updates on an in terface but not send updates via that interface.22. You are configing the serial interface of your cisco router,which of the following are valid encapsulation types you can use? (Select all that apply)A. Token RingB. EthernetC. HDLCD. PPPE. Frame RelayF. CHAP23> The TestKing network is displayed below: wants to use NAT in network displayed in the exhibit.Which commands will apply the NAT configuration to the proper interfaces? Select two.A. TestKing1(c on fig)# in terface serialO/1TestKi ng1(c on figif)# ip nat in sideB. TestKingl (config)# in terface serialO/1TestKingl(configif)# ip nat outsideC. TestKingl (con fig)# in terface fastethernetO/OTestKingl (configif)# ip nat in sideD. TestKingl (config)# in terface fastethernetO/OTestKing1(configif)# ip nat outsideE. TestKingl (c on fig)# in terface serialO/1TestKingl (configif)# ip nat outside source pool 200.2.2.18 255.255.255.252 F. TestKingl (config)# interface serialO/1TestKingl (configif)#ip nat inside source 10.10.0.0 255.255.255.024、Which of the following steps are necessary in order to add a new VLAN to a switched network? (Select all that apply.)A. Create the VLAN.B. Name the VLAN.C. Configure an IP address for the VLAN.D. Add the desired ports to the new VLAN.E. Add the VLAN to the VTP domain.ANFaOX) 10.10.0J/24Testfem^i10,10.0.074m LAN 200.Z2.18/300/TestKi25 > are bringing up a new Cisco Catalyst switch, and wish to connect it via a trunk to another switch from a different vendor, which uses the IEEE standard for the trunking method. When setting the encapsulation type on the trunk, what should you configure on the Cisco switch?A. Switch(c on fig)# switchport trunk encapsulati on islB. Switch(config)# switchport trunk encapsulation ietfC. Switch(configif)#switchport trunk encapsulation islD. Switch(configif)#switchport trunk encapsulation ietfE. Switch(configif)#switchport trunk encapsulation dotlq26> Which VTP mode should a Cisco switch be set to if this switch is to add or delete VLANs to a management domain?A. TransparentB. ServerC. AutoD. ClientE. User27 > In EIGRP, what kind of route information is stored in RAM and maintained by way of hello packets and update packets? (Select two answer choices)A. Neighbor TableB. SRF TableC. RTP TableD. Topology TableE. Query TableF. Dual Table28.Observe the following access list configuration:An access list was written with the four statements shown in the graphic. Which single access list statement will combine all four of these statements into a single statements that will have exactly the same effect?access-listIO permit 172.29^16.0WDX).255 access-list10 permit 172.29.17.0 0.0.0.255 access-list 10 permit 仃2.29.18.0 0.0.0.255 access-list 10 permit 172.29.19.00.0.0.255A. accesslist 10 permit 172.29.16.0 0.0.0.255B. accesslist 10 permit 172.29.16.0 0.0.1.255C. accesslist 10 permit 172.29.16.0 0.0.3.255D. accesslist 10 permit 172.29.16.0 0.0.15.255E. accesslist 10 permit 172.29.0.0 0.0.255.25529、Which of the following are benefits provided with access control lists (ACLs)? (Select all that apply)A. ACLs monitor the number of bytes and packets.B. Virus detection.C. ACLs dentify interesting traffic for DDR.D. ACLs provide IP route filteri ng.E. ACLs provide high network availability.F. ACLs classify and organize network traffic.30、You are a senior network administrator at TestKing and your trusty junior administrator tells you that he failed his task of adding VLAN 50 to a Catalyst switch in the network・ You enter in the 'show vtp status1 command and get this output:TK2# show vtp statusVTP Version :2Configuration Revision :7Maximum VLANs supported local :68Number of existing VLANs :8VTP Operating Mode :ClientVTP Domain Name :corpVTP Pruning Mode :DisabledVTP V2 Mode :DisabledVTP Traps Generation :DisabledMD5 digest :0x22 0xF3 OxlAConfiguration last modifled by 172.18.22.15 at 52803 lt:53:20 What commands must be issued on this switch to add VLAN 50 to the database? (Choose two.)A. TK2(configif)# switchport access vlan 50B. TK2(vlan)# vtp serverC. TK2(config)# configrevision 20D. TK2(config)# vlan 50 name TechE. TK2(vlan)# vlan 50F. TK2(vlan)# switchport trunk vlan 5031、Which of the following IOS commands could you use to troubleshoot a router connectivity problem on an IP network? (Select all valid answers)A. show ip routeB. ipconfigC. tracertD. show in terfacesE. tracerouteF. pingG. All of the above32、After connecting a PC to an available port on a switch, you find that the PC can not access any of the resources on the LAN・ No other PC*s connected to the switch appear to be having any issues. What is the most likely cause for this problem?A. The router lacks a routing table entry for the new hostB. The host switch port is assigned to the incorrect VLANC. The host MAC address is in correctly con figuredD. A STP instanee for the new host has not been initializedE. The switch does not have the MAC address hard coded in the CAM table.33、A simple TestKing network is displayed in the diagram below:PC1PCI sends an ARP requests for the MAC address of PCI, network performance slowsdramatically, and the switches detect an unusually high number of broadcast frames. What is the most likely cause of this?A. The portfast feature is not enabled on all switch ports.B. The PCs are in two different VLANS.C. Spanning Tree Protocol is not running on the switches ・D. PC2 is down and is not able to respond to the request.E. The VTP version running on the two switches do not match.34* Which of the following routing protocols are less likely prone to problems in non contiguous networks? (Select all valid responses)A. IGRPB. ICMPC. OSPFD. RIP v1E. RIP v2F. EIGRP35. What is the purpose of assigning an IP address to a switch?A. Provides local hosts with a default gateway addressB. Allows remote management of the switch. PC2C. Allows the switch to respond to ARP requests between two hostsD. Ensures that hosts on the same LAN can communicate with each other.36> You are securing a network for TestKing and want to apply an ACL (access control list) to an interface of a router. Which one of the following commands would you use?A. permit accesslist 101 outB. ip accessgroup 101 outC. apply accesslist 101 outD. accessclass 101 outE. ip accesslist eO out37> On the serial interface of a router, an inbound access list is configured to deny all traffic from UDP and TCP ports 21，23, and 25. All other traffic is permitted・ Based on this information, which types of traffic will be allowed through this interface? (Choose threee)A. SMTPB. DNSC. FTPD. TelnetE. HTTPF. POP338> You are about to configure PPP n the interface of a Cisco router. Which authentication methods could you use? (Select two answer choices) A. SSL B. SLIP C. PAP D. LAPB E・ CHAP F. VNP39* You have just obtained a modular Cisco router with 2 serial connections and a BRI/U interface. What other physical piece of hardware is required in order to establish an ISDN connection?A. Nothing. The router is already suitable.B. A BRI WAN interface in the router.C. An external NT1 to terminate the local loop.D. A TA/NT1 device on the router.40> In a lab, two routers are connected directly together using serial interfaces in a Backtoback configuration. No external DCE devices are being used. What additional command is needed to bring this link up?A. serial upB. clockrateC. clock rateD. dee rateE. dte rate二、实验题(20分)假设你是某公司的一名网络管理员，该公司有一个下属分公司，总公司与下属分公司全, 配置［了CHAP身份验证。
CCNA 4 Practice Final Exam Answer V3.1
1. Which of the following LCP options can be configured for PPP? (Choose three.)CHAPStackerIPCPCDPCPMultilink2. ITU-T Q.921 specifies the use of which protocol for sending control and signaling messages between the router and the ISDN switch?HDLCIPCPLAPBLAPDNCPSS73. Which of the following describe functions of the Point-to-Point protocol with regards to the OSI model? (Choose three.)PPP uses Layer 3 of the OSI model to establish and maintain a session between devices.PPP operates at all layers of the OSI model.PPP uses the data link layer to configure such options as error detection and compression.PPP provides a mechanism to multiplex several network layer protocols.PPP uses Network Control Protocols (NCP) to test and maintain connectivity between devices.PPP can be configured on both synchronous and asynchronous serial interfaces.4. Which of the following statements regarding point-to-point subinterfaces are true? (Choose two.)A point-to-point subinterface on one router must be connected to a similar subinterface on a remote router.Each point-to-point subinterface connection is configured with its own subnet.The DLCIs configured on the remote and local routers must be the same for the PVC.LMI frames are not transmitted through a subinterface.Routing updates in point-to-point networks are not subject to thesplit-horizon rule.5.How will data be transmitted from the router to the ISP if the router has the two links shown in the graphic?Both links will transmit data at the same rate.1544 bits can be transmitted simultaneously from the router over the T1 line.Both links will transmit bits one by one.The 56K link will transmit a maximum of 53 bits at the same time.6. A network administrator is asked to design a system to allow simultaneous access to the Internet for 250 users. The ISP for this network can only supply five public IPs. What can be used to accomplish this task?routable translationdynamic translationstatic translationport address translation7. Which of the following statements are true about Frame Relay? (Choose three.)Frame Relay operation is defined by a series of ISO standards.Frame Relay is a packet switched, connection-oriented, wide area network service.Frame Relay only supports point-to-point connections.A router can be considered as data terminal equipment (DTE) in a frame relay system.Frame Relay is a cell switched, connection-oriented, wide area network service.Frame Relay networks use a subset of the HDLC protocol to carry information.8. Why would data frames be discarded in a Frame Relay network? (Choose two.)The frame contains an incorrect IP address.An error has been detected in computing the frame check sequence.There is not enough bandwidth dedicated for the data contained in the frame.Data is transmitted at a rate greater than the access speed.The frame contains an incorrect DLCI.9.Which of the following can be concluded from the router output displayed in the graphic? (Choose two.)The local DLCI number of this PVC is 100.The interface has been configured for subinterfaces and this map is for subinterface 0.Inverse ARP has determined the remote ip address as 10.140.1.1.The LMI type is ANSI (0×64).There is currently no congestion on the link.10. When planning simple WAN connections for a small company, which feature of the three layer hierarchical model makes it a good choice for the WAN topology.It provides for redundancy.It allows for easy WAN expansion in case of company growth.It is less expensive.It provides faster connection time.It provides less latency and jitter.11.The command output shown in the graphic was taken from a Cisco 806 broadband router. Which kind of address translation is in effect on this router?staticdynamicoverloadprivatepublic12. A network administrator has been asked to provide the network in the United States with an ISDN WAN link. The router available to provide the WAN connection is a non-modular Cisco router with two serial connections. What must be done to adapt one of the serial interfaces of this router for the ISDN connection?Nothing. The router is already suitable.Purchase a BRI WAN interface card to install in the router.Purchase a U interface to install in the router.Purchase a TA/NT1 device to install on the router.13. How does Frame Relay technology process frames that contain errors? (Choose two.)Frame Relay services depend on the upper layer protocols to handle error recovery.It requires the receiving device to request that the sender retransmit erroneous frames.FECN, BECN, and DE bits are set in the frames to minimize errors.The receiving device drops any frames that contain errors without notifying the sender.The frame relay switch notifies the sender that errors were detected.14. Which statements about DHCP are true? (Choose three.)DHCP uses TCP.DHCP uses UDP.DHCP sends messages to the server on port 67.DHCP sends messages to the server on port 68.DHCP sends messages to the client on port 67.DHCP sends messages to the client on port 68.15. Which command configures the SPID on the first B channel of an ISDN interface?Router(config)# isdn spid0 spid-number [ldn]Router(config)# isdn spid1 spid-number [ldn]Router(config-if)# isdn spid0 spid-number [ldn]Router(config-if)# isdn spid1 spid-number [ldn]16.Which command would produce the output shown in the graphic?show ip dhcp server statisticsshow ip dhcp bindingdebug ip dhcp server eventsdebug ip dhcp binding17. Which commands can be used to identify which DLCIs are active? (Choose two.)show frame-relay mapshow frame-relay lmishow frame-relay pvcshow frame-relay interfaceshow interfacesshow ip route18. When PPP authentication is enabled, which of the following may be checked before establishing a PPP link between two devices? (Choose two.)the enable password on the remote devicethe ip host configuration on the remote devicethe security server database for the username and password of the remote devicethe hostname and enable password on the local devicethe local database for the username and password of the remote device19. Which of the following are supported by a BRI interface on a router? (Choose two.)Two independent channels that can carry analog data with a bandwidth of 64 KHz.A single 128 Kbps digital bearer channel.Two multiplexed channels carrying digital data.A single 64 Kbps signaling channel.A multiplexed data channel that can only handle SS7 information.A 16 Kbps delta channel used for signaling purposes.20.An administrator consoled into the Jelly router needs to telnet to the Butter router. What DLCI will the Jelly router place in the frame to perform this operation?11011522022521.What is placed in the address field of a frame that will travel from the DC office of ABC company to the Orlando office?MAC address of the Orlando routerMAC address of the DC router192.168.1.25192.168.1.26DLCI 100DLCI 20022. The WAN connection for a nationwide company with 250 offices must support constant connections to core layer services for file sharing, and occasional Internet access. Which combination of WAN technologies will meet these needs with minimum expense?Frame Relay PVC for Internet access and ATM for file server accessFrame Relay PVC for Internet access and ISDN for file server accessISDN for Internet access and X.25 for file server accessISDN for Internet access and Frame Relay PVC for file server access23. What does a DLCI of 0 indicate about a frame? (Choose two.)This is the first data frame sent by the router.This is a management frame.The encapsulation type is Cisco.The encapsulation type is IETF.The LMI type is Ansi or q933a.The LMI type is Cisco.24. A company needs a WAN connection that is capable of transferring voice, video, and data at a minimum data rate of 155 Mbps. Which WAN connection is the best choice?X.25DSLATMISDN BRIISDN PRI25. What are three features of the CHAP protocol? (Choose three.)exchanges a random challenge number during the session to verify identitysends authentication password to verify identityprevents transmission of login information in plain textdisconnects the PPP session if authentication failsinitiates a two-way handshake26. Which of the following devices is used to establish the communications link between the customer equipment and the local loop for digital lines?terminal adaptermodemCSU/DSUPBX switchISDN switchFrame Relay Switch27. Which command would be used to exclude the IP address 192.168.24.5 from the DHCP address pool on a router?Router(dhcp-config)# ip dhcp excluded-address 192.168.24.5Router# ip dhcp excluded-address 192.168.24.5Router(config-excluded)# ip dhcp excluded-address 192.168.24.5Router(config)# ip dhcp excluded-address 192.168.24.5Router(config)# excluded-address 192.168.24.5Router(dhcp-config)# excluded-address 192.168.24.528. A router needs to forward a message received from a host. How does the router identify the correct VC to forward the message? (Choose two.)The router forwards the frame to all ports in the network and learns the address from the reply frame.The destination host IP address is embedded in the DLCI.The router searches Inverse ARP tables for maps of DLCIs to IP addresses.A table of static mappings can be searched.The router broadcasts a request for the required IP address.29. Which of the following switching types will allow the communication devices in the provider’s network to be shared and only allocated to an individual subscriber during data transfer?circuit-switchedpacket-switchedframe-switcheddedicated-switched lineslease-switched30. Which of the following IP addresses are defined by RFC 1918 as private addresses? (Choose three.)192.168.146.0/22172.10.25.0/16172.31.0.0/1620.0.0.0/810.172.92.8/2931. Which of the following describes the PAP protocol? (Choose two.)sends unencrypted authentication passwordsperforms a three-way handshakeallows repeated login attemptsuses the remote router hostname to verify identitysends a random challenge throughout the session32. Which of the following protocols can be used to encapsulate data traffic sent from a router BRI interface? (Choose two.)Link Access Protocol – DataHigh-Level Data Link ControlLogical Link ControlSerial Data Link ControlPoint to Point protocolBinary Synchronous Control protocol33. Which statement explains why basic DSL is an unpopular WAN connectivity choice for enterprise computer departments that support home users?DSL offers insufficient bandwidth to home users.DSL requires the installation of new cables, which is not always possible for home users.DSL dialup connection time is too slow for business use.DSL has limited geographical availability.34. Which of the following are functions of the Local Management Interface used in Frame Relay networks? (Choose three.)exchange information about the status of virtual circuitsmap DLCIs to network addressesprovide flow controlprovide error notificationprovide congestion notificationsend keepalive packets to verify operation of the PVC35.An ISDN router is configured for DDR as shown in the graphic to provide Internet connectivity for the company. Immediately after a user in the company attempts opens a web browser to connect to the Internet, anotheruser in the company tries to download a file using FTP. What will happen? (Choose two.)The user that opened the browser will connect to the Internet because the DDR link will consider this traffic interesting.The Internet user will be disconnected because the FTP data will cause the DDR link to shut down.The DDR link will allow the FTP traffic because it is interesting.The DDR link will not allow the FTP traffic because it is not interesting.The FTP connection will fail because the DDR link is already in use for the Internet connection.The FTP connection will succeed because the web user already opened the DDR link.36. Which command will provide for CHAP authentication if the hostname on a challenging router is tampa with a password of florida?username tampa password floridausername tampa floridahostname tampa password floridahostname tampa florida37. Which of the following is a function of a DCE device?determines the next-hop address for a packetmultiplexes signals from several sourcesadapts information for use on a service provider’s networkused to directly connect two DTEs to simulate a WAN network38. Which operating systems support multiuser capability? (Choose three.) LinuxWindows 98Windows MEWindows XPWindows 200039. Why was NAT created? (Choose two.)to create firewalls on routersto conserve IP addressesto translate domain names into IP addressesto map network addresses to the corresponding data link addressto hide internal addresses from external devices40. Which of the following terms describes a device that will put data on the local loop?DLCICODCEDTEPRIBRI41. How many separate B channel circuits can be provisioned on a PRI interface that uses a T1 line for connectivity?21623243012842.The LAN attached to the Ethernet interface of the Raleigh router shown in the graphic is addressed with private IP addresses. If one public IP is assigned to the company, which commands could be used in a configuration that allows all devices with private IPs in this network to access the Internet? (Choose two.)ip nat inside source list 1 interface serial0 overloadip nat outside source list 1 interface serial0 overloadip nat inside serial0ip nat inside source list 1 pool Raleigh overloadip nat inside Raleigh overloadip inside nat source list 1 interface serial0 Raleigh43.Which of the following describes the WAN devices and cabling shown in the graphic? (Choose two.)A null-modem cable is used between RouterD and DeviceC for connectivity.A DB-25 or DB-9 serial cable is connected to interface S0/0 of RouterA.DeviceB and DeviceC are DCE devices.The same encoding scheme must be used by DeviceB and DeviceC.A synchronous serial connection exists between DeviceB and DeviceC.44. Which of the following are commonly used as Data Communications Equipment? (Choose two.)modemrouterCSU/DSUISDN SwitchFrame Relay Switch45. What does the command debug isdn q921 display?exchange of call setup and teardown messagesPAP and CHAP authentication trafficLayer 2 messages on the D channelprotocol errors and statisticsLayer 2 messages on the B channel46. A technician is testing the functionality of a recently installed router. The technician is unable to ping the serial interface of a remote router. The technician executes the show interface serial0/0command on the local router and sees the following line in the output:Serial0/0 is up, line protocol is downWhat are possible causes for this command output? (Choose three.) remote CSU/DSU failureserial cable missinginterface shutdownkeepalives not being sentclocking signal missing。
EWAN Practice Final Exam(Part B)
EWAN Practice Final Exam(Part B) Observable Description Max Value Earned Value1 correctness of response2 points for Option 30 points for any other option 2Refer to the exhibit. Router1 and Router2 each support separate areas of a data center, and are connected via a crossover cable. Resources attached to Router1 are unable to connect to resources attached to Router2. What is the likely cause?The crossover cable is faulty.The IP addressing is incorrect.There is a Layer 2 problem with the router connection.The upper layers are experiencing an unspecified problem.One or both of the Ethernet interfaces are not working correctly.Observable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2Refer to the exhibit. A host that is connected to Fa0/0 is unable to acquire an IP address dynamically from the DHCP server. The output of the debug ip dhcp server command shows "DHCPD: there is no address pool for 172.16.1.1". What is the problem?The default router for the 172Network pool is incorrect.The 172.16.1.1 address is already configured on Fa0/0.The pool of addresses for the 172Network pool is incorrect.The ip helper-address command should be implemented on the Fa0/0 interface.Observable Description Max Value Earned Value1 correctness of response2 points for Option 30 points for any other option 2A network administrator has moved the company intranet web server from a switch port to a dedicated router interface. How can the administrator determine how thischange has affected performance and availability on the company intranet?Conduct a performance test and compare with the baseline that was established previously.Determine performance on the intranet by monitoring load times of company web pages from remote sites.Interview departmental administrative assistants and determine if they think load time for web pages has improved.Compare the hit counts on the company web server for the current week to the values that were recorded in previous weeks.Observable Description Max Value Earned Value1 correctness of response2 points for Option 10 points for any other option 2A network administrator is analyzing the data from a network performance baseline. Which condition will not be indicated in the baseline data?the IP addressing scheme of the networkthe most heavily used parts of the networkcongested areas of the networkerror rates in different parts of the networkObservable Description Max Value Earned Value1 correctness of response2 points for Option 10 points for any other option 2At what physical location does the responsibility for a WAN connection change from the service provider to the user?DMZlocal loopCSU/DSUdemarcation pointObservable Description Max Value Earned Value1 correctness of response2 points for Option 40 points for any other option 2Refer to the exhibit. Router1 is not able to communicate with its peer that is connected to this interface. Based on the output as shown, what is the most likely cause?interface resetunplugged cableimproper LMI typePPP negotiation failureObservable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2What will be the result of adding the command ip dhcp excluded-address192.168.24.1 192.168.24.5 to the configuration of a local router that has been configured as a DHCP server?Traffic that is destined for 192.168.24.1 and 192.168.24.5 will be dropped by the router.Traffic will not be routed from clients with addresses between 192.168.24.1 and 192.168.24.5.The DHCP server will not issue the addresses ranging from 192.168.24.1 to 192.168.24.5.The router will ignore all traffic that comes from the DHCP servers with addresses 192.168.24.1 and 192.168.24.5.Observable Description Max Value Earned Value1 correctness of response2 points for Option 30 points for any other option 2Refer to the exhibit. All devices are configured as shown in the exhibit. PC1 is unable to ping the default gateway. What is the cause of the problem?The default gateway is in the wrong subnet.STP has blocked the port that PC1 is connected to.Port Fa0/2 on S2 is assigned to the wrong VLAN.S2 has the wrong IP address assigned to the VLAN30 interface.Observable Description Max Value Earned Value1 correctness of response2 points for Option 30 points for any other option 2Refer to the exhibit. Routers R1 and R2 have been configured with EIGRP in the same autonomous system. Computers PC1 and PC2 are not able to ping each other. Further investigation has revealed that the route to 192.168.10.0 is missing from the routing table on R2. What is the cause of the problem?The networks are not correctly summarized.The FastEthernet interfaces on R1 are configured as passive.The network statements on R2 are incorrectly configured.EIGRP on R1 does not recognize the 192.168.10.0 network.Observable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2Refer to the exhibit. An administrator is trying to connect Router1, a Cisco router, to a non-Cisco router using a serial connection. Why is the connection failing?A loopback is not set.The interface has been shut down.The wrong encapsulation is being used.Queuing cannot be used when connecting to non-Cisco devices.Observable Description Max Value Earned Value1 correctness of response2 points for Option 30 points for any other option 2Which important piece of troubleshooting information can be discovered about a serial interface using the show controllers command?queuing strategyserial cable typeinterface IP addressencapsulation methodObservable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2Which two statements are true about IPv6 link local addresses? (Choose two.) They begin with the 2000::/3 prefix.They begin with the FE80::/10 prefix.They are assigned by IANA to an organization.They must be manually configured by the administrator.They are assigned to a host by a stateless autoconfiguration process.Observable Description Max Value Earned Value1 correctness of response Option2 and Option 5 are correct.1 point for each correct option.0 points if more options are selected than required. 2Refer to the exhibit. An administrator has added the exhibited commands to routers A and B, but no routing updates are exchanged between the two routers. Based on the information that is given, what is the likely cause of the problem?Router A is advertising the wrong network.The authentication key strings do not match.The serial interfaces of routers A and B are not on the same network.The authentication key numbers do not match the EIGRP process number for both routers.Observable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2Which type of ACL will permit traffic inbound into a private network only if an outbound session has already been established between the source and destination?extendedreflexivestandardtime-basedObservable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2Refer to the exhibit. What would be the result of entering the exhibited configuration on a Frame Relay router?The local interface DLCI will be set to 102.All traffic that is destined to 172.16.16.8 will be sent as broadcast.Only broadcast traffic will be recieved on the Frame Relay interface.Routing protocol multicast updates can be forwarded across the Frame Relay PVC.Observable Description Max Value Earned Value1 correctness of response2 points for Option 40 points for any other option 2An administrator learns of an e-mail that has been received by a number of users in the company. This e-mail appears to come from the office of the administrator. The e-mail asks the users to confirm their account and password information. Which type of security threat does this e-mail represent?crackingphishingphreakingspammingObservable Description Max Value Earned Value1 correctness of response2 points for Option 20 points for any other option 2Refer to the exhibit. In the partial router configuration that is shown, what is the purpose of access list BLOCK_XYZ?to prevent source IP address spoofing by hosts on the Fa0/0 LANto block access by Fa0/0 LAN hosts to all network services beyond the routerto prevent users on the Fa0/0 LAN from opening Telnet sessions on the router to secure Fa0/0 hosts by allowing only locally sourced traffic into the Fa0/0 LAN。
CCNA-第二学期期末考试-Final-Exam
CCNA-第二学期期末考试-Final-Exam7请拜见图示。
网络连结有三台路由器：R1 、R2 和 R3 。
图中显示了全部三台路由器的路由。
从该输出能够获得什么结论？R1和R3经过S0/0/0接口相连。
R1 S0/0/0接口的IP 地点为10.1.1.2 。
R2 S0/0/1接口的IP 地点为10.3.3.2 。
R2连结到R3 的 S0/0/1接口。
√D8请拜见图示。
要达成路由器R1与WAN之间的连结，可使用以下哪两种设施？（选择两项。
）CSU/DSU设施调制解调器以太网互换机集线器网桥9请拜见图示。
依据如下图的输出，以下哪两项陈说是正确的？（选择两项。
）全部路由都处于稳固状态。
每条路由都有一个可行后继。
两台路由器之间的串行接口封闭。
EIGRP的管理距离已设置为50 。
R1 上已运转了show ip eigrp topology命令。
10一台使用RIP路由协议的路由器在路由表中存有到某个网络的路由条目。
以后，路由器收到另一条到同一目的网络的路由条目的更新，且与前者比，该路由此更新，路由器会采纳什么操作？路由器会将更新信息附带到路由表中。
路由器会将路由表中到该网络的路由条目标志为无效。
路由器会用新信息替代现有的路由表条目。
路由器会忽视新的更新。
11请拜见图示。
网络管理员将此命令增添到路由器R1 ： ip route 192.168.2.0 255.255.255.0 S0/0/0。
增添此命令会产生什么结果？此路由会在网络中自动流传。
发往网络的流量被转发到网络192.168.2.0 。
成立一条静态路由。
全部 C 类网络的流量都被转发到172.16.1.2 。
12请拜见图示。
从突出显示的输出能够获得什么信息？R1 生成路由。
自动总结被禁用。
选 B网络到R1 有一跳的距离。
网络使用的是有类路由协议。
13请拜见图示。
网络管理员从R3 上成功ping通了R1 。
接下来，管理员在R3上运转了show cdp neighbors命令。
CCNA 4 - Final Exam (B)
CCNA 4 - Final Exam (B)Posted by beotron at 9:23 PM1. Identify the factors that contribute to congestion on an Ethernet LAN. (Choose three.)• improper placement of enterprise level servers• addition of hosts to a physical segment• replacement of hubs with workgroup switches• increasing use of bandwidth intensive network applications• migration to full-duplex Ethernet within the LAN2. Which of the following are examples of TCP/IP application layer protocols? (Choose three.)• a terminal emulation protocol that supports remote console connections with various network devices • a protocol created by IBM that makes it easier for mainframes to connect t o remote offices• a protocol responsible for transporting electronic mail on TCP/IP networks and the Internet• a protocol that controls the rate at which data is sent to another computer• a protocol that exchanges network management information between a network device and a management console3. Which of the following eliminates switching loops?• hold-down timers• poison reverse• spanning tree protocol• time to live• split horizon protocol4. The show cdp neighbors command is a very useful network troubleshooting tool. Using the output in the graphic, select the statements that are true. (Choose two.)• CDP operates at the network layer of the OSI model.• The output of this command displays information about directly connected Cisco devices only.• The switch is attached to the SanJose1 FastEthernet0/21 interface.• SanJose1 is running CDP version 12.0.• SanJose1 has two fully operational, cdp-enabled Cisco switches directly connected to it.• SanJose2 is a 2600 series router running several routed protocols5. A network administrator can ping the Denver router, but gets a ‘Password Required but None Set’ message when trying to connect remotely via Telnet. Which command sequence must be applied to the Denver router to allow remote access?• Router(c onfig)# line console 0Router(config-line)# loginRouter(config-line)# password cisco• Router(config)# line vty 0 4Router(config-line)# loginRouter(config-line)# password cisco• Router(config)# line virtual terminalRouter(config-line)# enable loginRouter(config-line)# password cisco• Router(config)# line vty 0 4Router(config-line)# enable secretRouter(config-line)# password ciscoRouter(config)# enable secret ciscoRouter(config)# enable cisco6. Which of the following is associated with link-state routing protocols?• low processor overhead• poison reverse• routing loops• split horizon• shortest-path first calculations7. A router does not load its configuration after a power failure. After running the showstartup-configuration command, the adminstrator finds that the original configuration is intact. What is the cause of this problem?• The configuration register is set for 0×2100.• The configuration register is set for 0×2101.• The configuration register is set for 0×2102.• The configurati on register is set for 0×2142.• Boot system commands are not configured.• Flash memory is empty causing the router to bypass the configuration in NVRAM• Nederst på formularen8. Which commands are used to verify the content and placement of access control lists? (Choose three.) • show ip interface• show ip route• show processes• show running-config• show cdp neighbor• show access-lists9. Which of the following are required when creating a standard access control list? (Choose two.)• destination ad dress and wildcard mask• source address and wildcard mask• subnet mask and wildcard mask• access list number between 100 and 199 or 2000 and 2699• access list number between 1 and 99 or 1300 to 199910. Which of the following are keywords that can be used in an access control list to replace a dotted decimal wildcard mask? (Choose two.)• most• host• all• any• some• sum11. Refer to the diagram. All ports on Switch A are in the Sales VLAN and all ports on Switch B are in the Accounting VLAN. How many broadcast domains and how many collision domains are shown? (Choose two).• 3 collision domains• 3 broadcast domains• 5 broadcast domains• 9 collision domains• 10 collision domains• 13 collision domains12. Refer to the graphic. Using the most efficient IP addressing scheme and VLSM, which address can be configured on one of the serial interfaces?• 192.168.16.63/27• 192.168.16.158/27• 192.168.16.192/27• 192.168.16.113/30• 192.168.16.145/30• 192.168.16.193/3013. What is the purpose of the Spanning Tree Protocol (STP)?• prevents Layer 2 loops• prevents routing loops on a router• creates smaller collision domains• creates smaller broadcast domains• allows Cisco devices to exchange routing table updates14. What is the purpose of a loopback address when using the OSPF routing protocol?• activates the OSPF neighboring process• ensures a persistent router ID for the OSPF process• provides a backdoor for connectivity during the convergence process• streamlines and speeds up the convergence pr ocess15. Which statement is true regarding states of the IEEE 802.1d Spanning Tree Protocol?• Ports are manually configured to be in the forwarding state.• Ports listen and learn before going into the forwarding state.• Ports must be blocked before the y can be placed in the disabled state.• It takes 15 seconds for a port to go from blocking to forwarding16. Which sequence of commands is used to configure a loopback address on a router?• Router1(config)# interface loopback 1Router1(config-if)# ip address 192.168.1.1Router1(config)# interface serial 0/0• Router1(config-if)# loopback 1Router1(config-if)# ip address 192.168.1.1Router1(config)# interface serial 0/0• Router1(config-if)# loopback 1Router1(config-if)# ip address 192.168.1.1 255.255.255.0• Router1(config)# interface loopback 1Router1(config-if)# ip address 192.168.1.1 255.255.255.25517. Which routing protocols are classful and do not support VLSM? (Choose two.)• EIGRP• OSPF• RIP v1• RIP v2• IGRP18. Refer to the graphic. Two switches are connected together through a trunk port. SW2 displays the message shown. Which of the following will solve the duplex mismatch?• SW1(config)# interface fastethernet 0/1SW1(config-if)# duplex full• SW1(config)# interface fastethernet 0/1SW1(config-if)# full-duplex• SW2(config)# interface fastethernet 0/1SW2(config-if)# duplex full• SW2(config)# interface fastethernet 0/1SW2(config-if)# full-duplex19. Refer to the graphic. Two routers have been configured to use EIGRP. Packets are not being forwarded between the two routers. What could be the problem?• EIGRP does not support VLSM.• The routers were not configured to monitor neighbor adjacency changes.• The default bandwidth was used on the routers.• An incorrect IP address was configured on a router interface.20. According to the the provided router output, which of the following statements is true regarding PPP operation?• Only the link-establishment phase completed successfully.• Only the network-layer phase completed successfully.• Neither the link-establishment phase nor the the network-layer phase completed successfully.• Both the link-establishment and network-layer phase completed successfully21. Frame Relay is configured over a point-to-point connection between two routers. The output of the show frame-relay pvc command indicates that the status of this PVC is inactive. Which of the following devices could be the source of the problem? (Choose two.)• local router• local Frame Relay switch• remote router• remote Frame Relay switch• R3 has the following configuration:• R3# show running-config• –some output text omitted–• interface serial0/0• bandwidth 128• ip address 192.168.11.2 255.255.255.0• encapsulation frame-relay• frame-relay map ip 192.168.11.2 30 broadcast22. After the command R3# debug frame-relay packet is executed, a ping is issued from R3 to R1 but is unsuccessful. Based on the output of the debug command shown in the graphic and the router configuration, what might be problem?• No clock rate assigned.• There is an incorrect DLCI number in the map statement.• An incorrect IP address exists in the map statement.• The encapsulation command is missing the broadcast keywor d23. Which statements are true regarding the Frame Relay LMI? (Choose three.)• The LMI provides a virtual circuit (VC) status mechanism.• The LMI type must always be manually configured.• The available LMI types are NI1, DMS100 and 5ESS.• The LMI types supported by Cisco routers are CISCO and IETF.• The LMI type configured on the router must match the one used on the Frame Relay switch.• The LMI uses reserved DLCIs to exchange messages between the DTE and DCE24. Which statement describes the process that occurs in Network Address Translation (NAT) overloading?• Multiple private IP addresses are mapped to one public IP address.• The number of usable addresses assigned to a company is divided into smaller manageable groups.• A pool of IP addres ses are mapped to one or more MAC addresses.• The router acts as a DHCP server and assigns multiple public IP addresses for each private IP address configured25. Which two statements are true about the committed information rate on a Frame Relay link? (Choose two.)• The sum of the CIRs for all PVCs must be less than the port speed.• The sum of the CIRs for all PVCs must equal the port speed.• The sum of the CIRs for all PVCs can be greater than the port speed.• The DE bit will be set on frames that ar e transmitted in excess of the CIR.• Frames that are transmitted at greater than the CIR will be discarded at the source.• It is impossible to transmit frames at a rate in excess of the CIR26. Which of the following commands would be used to troubleshoot the processing of call control functions such as call setup, signaling, and termination?• show interface bri0/0• show isdn active• debug isdn q921• debug isdn q931• debug ppp negotiation• debug ppp authentication27. Which of the following statements are true regarding PPP? (Choose three.)• PPP can use synchronous and asynchronous physical media.• PPP can only be used between two Cisco devices.• PPP carries packets from several network layer protocols in LCPs.• PPP uses LCPs to establish, config ure, and test the data link connection.• PPP uses LCPs to agree on format options such as authentication, compression, and error detection28. A network administrator is evaluating authentication protocols for a PPP link. Which of the following reasons might lead to the selection of CHAP over PAP as the authentication protocol? (Choose three.) • establishes identities with a two-way handshake• uses a three-way authentication periodically during the session to reconfirm identities• control by the remote h ost of the frequency and timing of login events• transmits login information in encrypted format• uses an unpredictable variable challenge value to prevent playback attacks• makes authorized network administrator intervention a requirement to establish each session29. Why are static routes often used with ISDN DDR?• They are more stable than dynamic routing protocols.• They are more accurate than dynamic routing protocols because they are put in by a network administrator.• They are easier to modify when a faster technology is installed.• They prevent the unnecessary activation of the link30. Assuming that four bits have been borrowed to make subnets, identify the subnet network addresses. (Choose three.)• 192.168.14.8• 192.168.14.16• 192.168.14.24• 192.168.14.32• 192.168.14.148• 192.168.14.20831. A switch can be configured for three different forwarding modes based on how much of a frame is received before the forwarding process begins. Each of the numbered arrows in the accompanying graphic signifies the point in a frame where a particular forwarding mode will begin. Which one of the following groups reflects the sequence of forwarding modes signified by the numbered arrows?• 1) fast forward• 2) fragment free• 3) store-and-forward• 1) sto re-and-forward2) fragment free3) fast forward• 1) fragment free2) fast forward3) store-and-forward• 1) fast forward2) store-and-forward3) fragment free32. Which of the following commands will display a communication message on a router before the router prompt is shown?• banner motd * Property of TLC. UNAUTHORIZED USERS WILL BE PROSECUTED TO THE FULL EXTENT OF THE LAW. *• message Property of TLC. UNAUTHORIZED USERS WILL BE PROSECUTED TO THE FULL EXTENT OF THE LAW.• banner * Property of TLC. UNAU THORIZED USERS WILL BE PROSECUTED TO THE FULL EXTENT OF THE LAW. *• hostname (Property of TLC. UNAUTHORIZED USERS WILL BE PROSECUTED TO THE FULL EXTENT OF THE LAW.)• Øverst på formularen33. A router needs to be added to OSPF area 0. Which commands should be used to enable OSPF on the router? (Choose two.)• RouterA(config)# router ospf• RouterA(config)# router ospf 1• RouterA(config-router)# network 192.168.2.0 0.0.0.255 0• RouterA(config-router)# network 192.168.2.0 0.0.0.255 area 0• RouterA(config-router)# network 192.168.2.0 255.255.255.0 034. Refer to the graphic. Which of the following commands will configure router A for OSPF?• router ospf 1network 192.168.10.0• router ospf 1network 192.168.10.64 0.0.0.63 area 0network 192.168.10.192 0.0.0.3 area 0• router ospf 1network 192.168.10.64 255.255.255.192network 192.168.10.192 255.255.255.252• router ospf 1network 192.168.10.0 area 035. Which of the following protocols would exchange information between routers to share network addresses and their metrics?• TCP• RIP• CSMA/CD• Ethernet36. Which ISDN device can be directly connected to a two-wire local loop in a North American city?• a router with a serial interface• a router with an S/T interface• a router with a U interface• an ISDN terminal adapter37. The output of the show ip interfaces brief command indicates that Serial0 is up but the line protocol is down. Which of the following are possible causes for the line protocol being in the down state? (Choose two.)• The clock rate is not set on the DTE.• An incorrect default gateway is set on the router.• A network is missing from the routing protocol configuration.• The encapsulation on the Serial0 interface is incorrect.• Keepalives are not being sent by the remote device38. Which of the following is a characteristics of TCP? (Choose two.)• data transport reliability• best path determination• establishing, maintaining, and terminating virtual circuits• encapsulation of packets in a data frame with source and destination MAC addresses• best-effort datagram delivery39. Which statement is true regarding the command ip route 192.168.7.24 255.255.255.248 192.168.7.9? (Choose two.)• A packet destined for host 192.168.7.30 will be forwarded to address 192.168.7.9.• 192.168.7.9 i s the destination network for this route.• 192.168.7.24 is the next-hop router in this command.• This command is issued from the interface configuration mode.• This command is used to define a static route40. Which of the following application layer protocols use TCP? (Choose three.)• SMTP• FTP• SNMP• HTTP• TFTP• DHCP41. Which terms refer to Frame Relay congestion management mechanisms? (Choose three.)• BECN• DLCI• DE• FECN• LMI• Inverse ARP42. Which of the following router commands will verify that a path exists to a destination network?• Router# show ip interfaces brief• Router# show ip route• Router# show cdp neighbors• Router# show running-config• Router# show protocols43. When EIGRP is configured on a router, which table of DUAL information is used to calculate the best route to each destination router?• router table• topology table• DUAL table• CAM table• ARP table44. Refer to the graphic. Routers A and B have EIGRP configured and automatic summarization has been disabled on both routers. Which of the following commands is used on router A to summarize the attached routes, and to which interface is this command applied? (Choose two)• ip summary-address eigrp 1 192.168.10.64 255.255.255.192• ip area-range eigrp 1 192.168.10.80 255.255.255.224• summary-address 192.168.10.80 0.0.0.31• ip summary-address eigrp 1 192.168.10.64 0.0.0.63• serial interface on router A• serial interface on router B45. A router with two LAN interfaces, two WAN interfaces, and two loopback interfaces configured is operating with OSPF as its routing protocol. What is used by the OSPF process to assign the router ID? • the IP address of the interface configured with priority 0• the OSPF area ID configured on the interface with the highest IP addres s• the loopback with the highest IP address configured• the highest IP address on the LAN interfaces• the highest IP address configured on the WAN interfaces46. Given the IP address and subnet mask of 172.16.134.56 255.255.255.224, on which subnetwork does this address reside?• 172.0.0.0• 172.16.134.0• 172.16.134.32• 172.16.134.48• 172.16.134.47• 172.16.134.6347. Which commands show when the last IGRP routing update was received? (Choose two.)• Router# show ip protocols• Router# show version• Router# show interfaces• Router# show ip updates• Router# show ip route48. When using access control lists to filter traffic, which of the following is used to track multiple sessions occurring between hosts?• IP addresses• subnet masks• port numbers• routed protocols• routing protocols• interfaces49. Given the IP address and subnet mask of 172.16.134.64 255.255.255.224, which of the following would describe this address?• This is a useable host address.• This is a broadcast address.• This is a network address.• This is not a valid address50. The company network shown in the drawing has to be subnetted. The company has leased the ClassC IP address of 200.1.2.0. Which of the following network addresses and masks would be appropriate for one of the subnetworks?• 200.1.2.96 255.255.255.192• 200.1.2.160 255.255.255.224• 200.1.2.80 255.255.255.224• 200.1.2.32 255.255.255.240。
CCNA第四学期期末考试答案
1、如果将命令ip dhcp excluded-address 10.10.4.1 10.10.4.5添加到配置为DHCP 服务器的本地路由器配置中，结果是什么？该路由器将丢弃发往10.10.4.1 和10.10.4.5 的流量。
不会路由地址处于10.10.4.1 到10.10.4.5 之间的客户端所发出的流量。
DHCP 服务器不会分配10.10.4.1 到10.10.4.5 之间的地址。
该路由器将忽略来自地址处于10.10.4.1 到10.10.4.5 之间的DHCP 服务器的流量。
2、请参见图示。
连接到Fa0/0 的主机无法从此DHCP 服务器获取IP 地址。
debug ip dhcp server命令"DHCPD: there is no address pool for 192.168.1.1"。
问题出在哪里？DHCP 地址池中排除了地址192.168.1.1。
192Network 的地址池不正确。
网络地址池的默认路由器不正确。
地址192.168.1.1 已经用在接口Fa0/0 上。
3、请参见图示。
R1 针对内部网络10.1.1.0/24 执行NAT 过载。
主机A 向web 服务器发送了一个数据包。
务器返回的数据包的目的IP 地址是什么？10.1.1.2:1234172.30.20.1:1234172.30.20.1:3333192.168.1.2:804、请参见图示。
网络管理员对Router1 和Router2 上发出图示中的命令。
但其后在检查路由表时发现，两个路由器均不能获知相邻路由器的LAN 网络。
RIPng 配置最可能发生什么问题？串行接口处于不同的子网上。
接口上未启用RIPng 进程。
未配置RIPng 网络命令。
Router1 和Router2 的RIPng 进程不匹配。
5、请参见图示。
使用default-router和dns-server命令指定的TCP/IP 配置信息是如何获得的？TCP/IP 信息先转发至10.0.1.3，再提供给DHCP 客户端。
计算机四级模拟试题(附参考答案)
计算机四级模拟试题（附参考答案）一、单选题（共63题，每题1分，共63分）1.下面哪一个程序或者命令可以用来探测源节点到目标之间数据报文所经过的路径（）？A、routeB、netstAtC、trACertD、senD正确答案：C2.奈奎斯特公式表征的是通信信道的（）。
A、误码率B、信噪比C、数据传输频率D、数据传输能力正确答案：D3.STP的主要目的是（）。
A、减少环路B、消除网络的环路C、保持多个环路D、保持单一环路正确答案：B4.表征一个信道传输数据能力的指标是（）。
A、信道容量B、信噪比C、传输速率D、误码率正确答案：A5.第三层交换机采用（）来维护路由表，因而能实现线速的路由。
A、ASIC硬件B、ASCII硬件C、ASSC硬件D、ACSI硬件正确答案：A6.OSI参考模型中起到将通信子网的技术、设计和欠缺与上层相隔离作用的是（）。
A、表示层B、网络层C、物理层D、传输层正确答案：D7.ADSL服务采用的多路复用技术属于（）。
A、频分多路复用B、同步时分多路复用C、波分多路复用D、异步时分多路复用正确答案：A8.查看网络状态的CMD命令是（）。
A、netstAtB、netstAtC、netuseD、netuse正确答案：B9.华为S3700交换机是____层交换机，端口速率为____百兆（）。
A、二、百B、三、千C、二、千D、三、百正确答案：D10.若在1200波特的通信线路上采用QAM．16调制方案，则可达到的传输率为（）。
A、1200BpsB、2400BpsC、4800BpsD、9600Bps正确答案：C11.TCP/IP参考模型的核心层是（）。
A、应用层B、网络互联层C、传输层D、网络接口层正确答案：B12.光纤分布式数据接口FDDI采用的拓扑结构是（）。
A、星形B、环形C、总线形D、树形正确答案：B13.你想发现到达目标网络需要经过哪些路由器，你应该使用什么命令（）？A、pingB、nslookupC、trACertD、ipConfig正确答案：C14.下列关于基于主机的入侵检测理解不正确的是（）。
计算机四级网络工程师模拟试题+答案
计算机四级网络工程师模拟试题+答案一、单选题（共82题，每题1分，共82分）1.网络拓扑中，属于无规则拓扑的是( )。
A、网状拓扑B、总线型拓扑C、环型拓扑D、星型拓扑正确答案：A2.在FTP中，客户发送PASV命令的目的是( )。
A、请求使用被动模式建立数据连接B、向服务器发送用户的口令C、说明要上传的文件类型D、检索远程服务器存储的文件正确答案：A3.用户需要动态请求和释放系统资源，在用户程序中所使用的方法是( )。
A、调用中断服务程序B、通过系统调用C、利用命令输入D、以管理员身份运行正确答案：B4.关于Napster的描述中，正确的是( )。
A、P2P文件共享的起源B、P2P文件共享的起源C、主要进行视频分享D、由迅雷公司设计正确答案：B5.关于SMB的描述中，正确的是( )。
A、Google是制定者之一B、工作于网络层C、使用NetBIOS的应用程序接口D、主要用于Linux正确答案：C6.计算机系统中拥有各种软硬件资源，内存是属于( )。
A、可重用资源B、临界资源C、不可重用资源D、共享资源正确答案：A7.关于X.800的描述中，正确的是( )。
A、将安全服务分为三类B、由IETF制定C、规定了安全等级D、目的是利用安全机制阻止安全攻击正确答案：D8.关于SIP中的用户代理，错误的是( )。
A、UAC负责发起呼叫B、UAC位于用户终端中C、UAS位于远程的代理服务器中D、UAS负责接受呼叫并进行响应正确答案：C9.关于XMPP的描述中，正确的( )。
A、工作于传输层B、采用纯P2P结构C、基于XMLD、由ITU制定正确答案：C10.关于网络故障管理的描述中，错误的是( )。
A、可以识别网络元素B、可与计费管理互通C、可以进行业务恢复D、可以隔离所有故障正确答案：D11.为了保证临界资源的正确使用，进程在结束对临界资源的访问后必须通过下列哪一区才能离开( )。
A、退出区B、进入区C、临界区D、剩余区正确答案：A12.关于虚电路交换方式的描述中，正确的是( )。
思科CCNA第三学期期末考试完整版
参加考试 - ES ｗit ｃｈi ｎg Ｆｉｎal Ex ａｍ － CC ＮA Ex ｐlo ｒation: LAN 交换和无线 (版本 4。
0）1 以下哪项参数用于唯一标识一个无线网络,使其与其它网络区分开来？S ＳIDOFDMWEPDSSS2 分层网络模型具有哪三项优点?(选择三项。
）带宽争用现象减少物理布局范围减小网络的容错能力提高无需配线间无需第三层功能管理和故障排除工作简化3 在将 Cataly ｓt 交换机迁移到其它 VTP管理域之前，应该进行哪三项任务？选择正确的 V ＴＰ 模式和版本.使用新管理域的名称配置交换机．从新域中的 ＶTP 服务器上下载 VTP 数据库。
配置新域内的 ＶTP 服务器，使其识别该交换机的 ＢID 。
重置 ＶＴP 计数器,使交换机可与新域内的其它交换机同步。
检验交换机的配置修订版号是否比新域内的其它交换机的低。
4下列哪两种说法正确地描述了生成树协议？(选择两项.)它只在第２层使用。
它在交换机上配置。
它消除了网络拓扑中的第２层环路.它限制了端口上所允许的有效ＭＡＣ地址的数量。
它使VLＡN 信息得以传播到网络中的其它交换机.5下列哪种方法可建立用于配置Linkｓys WRT3０0N 无线接入点的管理连接?与接入点关联，然后与接入点建立超级终端会话.以物理方式连接到接入点，然后重新启动计算机以启动配置软件。
在接入点所在的IＰ子网内的计算机上的wｅb 浏览器中输入接入点的默认IP 地址。
修改与接入点连接的计算机的ＴCP/ＩＰ属性,使其与接入点处于同一个网络中,然后重新机以建立连接。
6ﻫﻫ请参见图示。
源地址并非0019.d2e4．d９f７的帧进入接口Ｆa0/24 时会发生什么情况?Fa0/24 会变为error—disaｂled（错误—禁用)状态。
传入帧会被丢弃。
Fa０/24 端口LED 会关闭。
安全违规计数会增加。
7可采用哪两种方法删除交换机的MAC 地址表中的条目? （选择两项。
计算机四级模考试题与参考答案
计算机四级模考试题与参考答案一、单选题（共63题，每题1分，共63分）1.DHCP协议的功能是（）。
A、远程终端自动登陆B、为客户机自动分配IP地址C、使用DNS名字自动登录D、为客户自动进行注册正确答案：B2.按照国际标准化组织制定的开放系统互连参考模型，实现端用户之间可靠通信的协议层是：（）。
A、传输层B、应用层C、网络层D、会话层正确答案：A3.数据传输中产生差错的主要原因是（）。
A、设备质量B、线路拥塞C、热噪声D、冲击噪声正确答案：D4.广域网WAN一般采用（）。
A、“广播”传输方式B、“无线”传输方式C、“光纤”传输方式D、“存储－转发”传输方式正确答案：D5.在OSI参考模型中，数据链路层的协议数据单元(PDU)称为（）。
A、包B、报文C、帧D、位流正确答案：C6.TCP/IP参考模型中提供无连接数据报服务的传输协议是（）。
A、HTTPB、UDPC、SMTPD、TCP正确答案：B7.DES加密采用的密钥长度是（）。
A、56BitB、64BitC、128BitD、168Bit正确答案：A8.数据解封装的过程是（）。
A、流—帧—包—段—数据B、数据—段—包—帧—流C、段—包—帧—流—数据D、数据—包—段—帧—流正确答案：A9.IEEE802．1lA在传输层的速率可达到（）。
A、25MBpsB、54MBpsC、100MBpsD、125MBps正确答案：A10.OSPF计算Cost主要是依据哪些参数( )。
A、mtuB、跳数C、带宽D、延时正确答案：C11.当网络中需要有大量的IP电话机和WLAN的AP接入时，我们一般会考虑哪种功能的交换机（）。
A、具有STP边缘端口功能的交换机B、具有POE功能的交换机C、具有SACG功能的交换机D、具有QOS功能的交换机正确答案：B12.关于交换技术的说明中错误的是（）。
A、报文交换的电路利用率高B、电路交换适用于猝发式通信C、报文交换不能满足实时通信D、分组交换适用于交互式通信正确答案：B13.当物理信道的可用带宽超过单个原始信号所需带宽时可采用的复用技术是（）。
EWAN Practice Final Exam满分答案
EWAN Practice Final Exam满分答案参加考试 - EWAN Practice Final Exam - CCNA Exploration: 接入 WAN (版本 4.0)1 下列哪两项是 DSL 技术的特征？（选择两项。
）上传的传输速率通常高于下载速率。
服务提供商在电话网络的本地环路上部署 DSL。
DSL 下载速度会因高 POTS 语音流量而下降。
过滤器和分线器可以使 POTS 和 DSL 流量共享介质。
DSL 是共享介质，允许众多用户共享 DSLAM 的可用带宽。
下列哪三种说法正确描述了 WAN 中设备的角色？（选择三项。
） 2CSU/DSU 用于端接本地数字环路。
调制解调器用于端接本地数字环路。
CSU/DSU 用于端接本地模拟环路。
调制解调器用于端接本地模拟环路。
路由器通常被视为 DTE 设备。
路由器通常被视为 DCE 设备。
3请参见图示。
R1 会响应哪些 DHCP 请求？R1 收到的所有 DHCP 请求广播到 10.0.1.255 的请求目的地址为 10.0.1.3 的 DNS 请求FastEthernet 0/0 接口上收到的请求来自未列入排除列表的任何网络的请求4请参见图示。
为什么这两台路由器无法建立 PPP 会话？用户名配置错误。
IP 地址位于不同的子网上。
时钟频率配置在链路上错误的一端。
两台路由器上的 CHAP 口令必须不同。
Router1 上的 serial 0/0/0 接口必须连接到 Router2 的 serial 0/0/1 接口。
5帧中继网络中的路由器将主机发来的消息转发出去。
路由器使用哪两种方法来确定要将消息转发到的正确虚电路？（选择路由器会将该帧转发给网络中的所有端口，然后从应答帧中获悉地址。
目的主机 IP 地址内嵌在 DLCI 中。
路由器会在逆向 ARP 表中搜索 DLCI 与 IP 地址的映射情况。
搜索静态映射表。
路由器会以广播方式请求所需的 IP 地址。
计算机四级网络工程师模拟试题含参考答案
计算机四级网络工程师模拟试题含参考答案一、单选题（共82题，每题1分，共82分）1.关于VoIP系统的描述中，错误的是( )。
A、网守是关键设备B、可实现Phone-to-Phone通信C、可支持多方通话D、最早由Skype公司制定统一标准正确答案：D2.在可变分区存储管理方案中，在对一个分区进行回收时，若该分区的起始地址加长度等于空闲区表中某个登记项所表示空闲区的起始地址，则表示( )。
A、该回收分区的下邻分区是空闲的B、该回收分区的上邻分区是空闲的C、该回收分区的上、下邻分区都不是空闲的D、该回收分区的上、下邻分区都是空闲的正确答案：A3.关于RIP和OSPF协议的描述中，正确的是( )。
A、RIP和OSPF都使用向量-距离算法B、RIP使用链路-状态算法，OSPF使用向量-距离算法C、RIP使用向量-距离算法，OSPF使用链路-状态算法D、RIP和OSPF都使用链路-状态算法正确答案：C4.下列程序中，哪一个不属于操作系统内核程序( )。
A、设备驱动程序B、用户应用程序C、中断服务程序D、进程调度程序正确答案：B5.关于IEEE802.11标准的描述中，错误的是( )。
A、采用的是层次结构模型B、采用的是层次结构模型C、MAC层实现介质访问控制功能D、仅支持争用服务的访问方式正确答案：D6.关于IEEE802参考模型的描述中，正确的是( )。
A、对应TCP/IP参考模型的传输层B、对应OSI参考模型的表示层C、主要关注局域网的标准化D、应用层是其中的重要层次正确答案：C7.在网络协议的要素中，定义控制信息结构与格式的是( )。
A、时序B、语法C、服务D、接口正确答案：B8.当使用进程撤销原语撤销进程时，下列哪一个选项描述的顺序是正确的( )。
A、找到对应进程的B、撤销其下的子孙进程，释放该进程资源，撤销该C、找到对应进程的D、清空该E、释放该进程资源，撤销其下的子孙进程F、找到对应进程的G、清空该H、撤销其下的子孙进程，跳转到调度程序正确答案：A9.UNIX 操作系统中，对文件系统中空闲区的管理通常采用( )。
CCNA 4 Final Exam V4.0 Answers
1. What functionality do access control lists provide in the implementation of dynamic NAT on a Cisco router?define which addresses can be translateddefine which addresses are assigned to a NAT pooldefine which addresses are allowed out the routerdefine which addresses can be accessed from the inside network2. Which three guidelines would help contribute to creating a strong password policy? (Choose three.)Once a good password is created, do not change it.Deliberately misspell words when creating passwords.Create passwords that are at least 8 characters in length.Use combinations of upper case, lower case, and special characters.3.Refer to the exhibit. Every time the administrator reboots this router, the boot process ends in setup mode. What is a possible problem?There is insufficient RAM for the IOS to load on this router.A password recovery process should be done on this router.The bootstrap version and the version of the IOS are different.The IOS image is damaged and must be reloaded using tftpdnld.The configuration register is set to ignore the startup configuration.4. Which option correctly defines the capacity through the local loop guaranteed to a customer by the service provider?BEDECIRCBIR5.Refer to the exhibit. A host connected to Fa0/0 is unable to acquire an IP address from the DHCP server. The output of the debug ip dhcp server command shows "DHCPD: there is no address pool for 10.1.1.1". What is the problem?The 10.1.1.1 address is already configured on Fa0/0.The default router for the 10Network pool is incorrect.The ip helper-address must be added to Fa0/0 interface.The pool of addresses for the 10Network pool is incorrect.6. Which data link layer encapsulation protocol is used by default for serial connections between two Cisco routers?ATMFrame RelayHDLCPPPSDLCRefer to the exhibit. Which statement correctly describes how Router1 processes an FTP request that enters interface s0/0/0 and is destined for an FTP server at IP address 192.168.1.5?The router matches the incoming packet to the statement that was created by the access-list 201 deny icmp 192.168.1.0 0.0.0.255 any command, continues comparing the packet to the remaining statements in ACL 201 to ensure that no subsequent statements allow FTP, and then the router drops the packet.The router reaches the end of ACL 101 without matching a condition and drops the packet because there is no statement that was created by the access-list 101 permit ip any any command.The router matches the incoming packet to the statement that was created by the access-list 101 permit ip any 192.168.1.0 0.0.0.255 command and allows the packet into the router.It matches the incoming packet to the statement that was created by the access-list 201 permit ip any any command and allows the packet into the router.8. Compared with IDS systems, what can IPS systems do to provide further protection of computer systems?detect potential attacksstop the detected attack from executingupdate OS patches for computer systemsscan computer systems for viruses and spyware9. Which IEEE 802.16 broadband wireless technology allows users to connect to the ISP at speeds comparable to DSL and cable?Wi-FisatelliteWiMAXMetro Ethernet10. A network administrator has changed the VLAN configurations on his network switches over the past weekend. How can the administrator determine if the additions and changes improved performance and availability on the company intranet?Conduct a performance test and compare with the baseline that was established previously.Interview departmental secretaries and determine if they think load time for web pages has improved.Determine performance on the intranet by monitoring load times of company web pages from remote sites.Compare the hit counts on the company web server for the current week to the values that were recorded in previous weeks.11.Refer to the exhibit. What is the meaning of the term dynamic in the output of the command?The bandwidth capability of the interface increases and decreases automatically based on BECNs.The Serial0/0/1 interface acquired 172.16.3.1 from a DHCP server.The mapping between DLCI 100 and 172.16.3.1 was learned through Inverse ARP.DLCI 100 will automatically adapt to changes in the Frame Relay cloud.12. Which type of ACL will permit traffic inbound into a private network only if an outbound session has already been established between the source and destination?extendedreflexivestandardtime-based13. Which two statements are true about IPv6 link local addresses? (Choose two.)They begin with the 2000::/3 prefix.They begin with the FE80::/10 prefix.They are assigned by IANA to an organization.They must be manually configured by the administrator.They are assigned to a host by a stateless autoconfiguration process.14. A company is looking for a WAN solution to connect its headquarters site to four remote sites. What are two advantages that dedicated leased lines provide compared to a shared Frame Relay solution? (Choose two.)reduced jitterreduced costsreduced latencythe ability to burst above guaranteed bandwidththe ability to borrow unused bandwidth from the leased lines of other customers15.Refer to the exhibit. A network administrator is trying to connect R1 remotely to make configuration changes. Based on the exhibited command output, what will be the result when attempting to connect to R1?failure to connect due to Telnet not being enabledfailure to connect due to incomplete configuration for Telneta successful connection and ability to make configuration changesa successful connection but inability to make configuration changes because of the absence of an enable secret password16. What are two effective measures for securing routers? (Choose two.)Protect all active router interfaces by configuring them as passive interfaces.Configure remote administration through VTY lines for Telnet access. Use quotes or phrases to create pass phrases.Disable the HTTP server service.Enable SNMP traps.17. An issue of response time has recently arisen on an application server. The new release of a software package has also been installed on the server. The configuration of the network has changed recently. To identify the problem, individuals from both teams responsible for the recent changes begin to investigate the source of the problem. Which statement applies to this situation?Scheduling will be easy if the network and software teams work independently.It will be difficult to isolate the problem if two teams are implementing changes independently.Results from changes will be easier to reconcile and document if each team works in isolation.Only results from the software package should be tested as the network is designed to accommodate the proposed software platform.Refer to the exhibit. From the output of the show interfaces and ping commands, at which layer of the OSI model is a fault indicated?applicationtransportnetworkdata linkphysical19. Which technology is used to dynamically map next hop, network layer addresses to virtual circuits in a Frame Relay network?Inverse ARPLMIDLCI20. An administrator learns of an e-mail that has been received by a number of users in the company. This e-mail appears to come from the office of the administrator. The e-mail asks the users to confirm their account and password information. Which type of security threat does this e-mail represent?crackingphishingphreakingspamming21.Refer to the exhibit. Which data transmission technology is being represented?TDMPPPHDLCSLIP22.Refer to the exhibit. Results of the show vlan and show vtp status commands for switches S1 and S2 are displayed in the exhibit. VLAN 11 was created on S1. Why is VLAN 11 missing from S2?There is a Layer 2 loop.The VTP domain names do not match.Only one switch can be in server mode.S2 has a higher spanning-tree priority for VLAN 11 than S1 does.23. What is the result of adding the global command servicepassword-encryption to the configuration of a router?Line passwords are encrypted with type 7 encryption.Enable passwords are encrypted with type 5 encryption.All services must provide an encrypted password to function.Only encrypted messages are allowed for router communication.24. While troubleshooting a problem with an e-mail server, an administrator observes that the switch port used by the server shows "up, line protocol up". The administrator cannot ping the server. At which layer of the OSI model is the problem most likely to be found?application layernetwork layerdata link layerphysical layer25. Where does a service provider assume responsibility from a customer for a WAN connection?local loopDTE cable on routerdemarcation pointdemilitarized zone26. What will be the result of adding the command ip dhcp excluded-address 192.168.24.1 192.168.24.5to the configuration of a local router that has been configured as a DHCP server?Traffic that is destined for 192.168.24.1 and 192.168.24.5 will be dropped by the router.Traffic will not be routed from clients with addresses between192.168.24.1 and 192.168.24.5.The DHCP server will not issue the addresses ranging from 192.168.24.1 to 192.168.24.5.The router will ignore all traffic that comes from the DHCP servers with addresses 192.168.24.1 and 192.168.24.5.27.Refer to the exhibit. Partial results of the show access-lists and show ip interface FastEthernet 0/1 commands for router Router1 are shown. There are no other ACLs in effect. Host A is unable to telnet to host B. Which action will correct the problem but still restrict other traffic between the two networks?Apply the ACL in the inbound direction.Apply the ACL on the FastEthernet 0/0 interface.Reverse the order of the TCP protocol statements in the ACL.Modify the second entry in the list to permit tcp host 172.16.10.10 any eq telnet .28.Refer to the exhibit. The corporate network that is shown has been assigned network 172.16.128.0/19 for use at branch office LANs. If VLSM is used, what mask should be used for addressing hosts at Branch4 with minimal waste from unused addresses?/19/20/21/22/23/2429.Refer to the exhibit. RIPv2 has been configured on all routers in the network. Routers R1 and R3 have not received any RIP routing updates. What will fix the issue?Enable RIP authentication on R2.Issue the ip directed-broadcast command on R2.Change the subnet masks to 10.11.12.0/8 and 172.16.40.0/16 on R2.Enable CDP on R2 so that the other routers will receive routing updates.30.Refer to the exhibit. This serial interface is not functioning correctly. Based on the output shown, what is the most likely cause?improper LMI typeinterface resetPPP negotiation failureunplugged cable31. Which statement is true about PAP in the authentication of a PPP session?PAP uses a two-way handshake.The password is unique and random.PAP conducts periodic password challenges.PAP uses MD5 hashing to keep the password secure.32. An administrator is configuring a dual stack router with IPv6 and IPv4 using RIPng. The administrator receives an error message when trying to enter the IPv4 routes into RIPng. What is the cause of the problem?When IPv4 and IPv6 are configured on the same interface, all IPv4 addresses are over-written in favor of the newer technology.Incorrect IPv4 addresses are entered on the router interfaces.RIPng is incompatible with dual-stack technology.IPv4 is incompatible with RIPng.33. What is tunneling?using digital certificates to ensure that data endpoints are authentic creating a hash to ensure the integrity of data as it traverses a networkusing alternate paths to avoid access control lists and bypass security measuresencapsulating an entire packet within another packet for transmission over a network34. Which statement is true about NCP?Link termination is the responsibility of NCP.Each network protocol has a corresponding NCP.NCP establishes the initial link between PPP devices.NCP tests the link to ensure that the link quality is sufficient. 35.Refer to the exhibit. A network administrator is creating a prototype to verify the new WAN design. However, the communication between the two routers cannot be established. Based on the output of the commands, what can be done to solve the problem?Replace the serial cable .Replace the WIC on RA.Configure RA with a clock rate command.Issue a no shutdown interface command on RB.36.Refer to the exhibit. Based on the output as shown, which two statements correctly define how the router will treat Telnet traffic that comes into interface FastEthernet 0/1? (Choose two).Telnet to 172.16.10.0/24 is denied.Telnet to 172.16.20.0/24 is denied.Telnet to 172.16.0.0/24 is permitted.Telnet to 172.16.10.0/24 is permitted.Telnet to 172.16.20.0/24 is permitted.37. Which Frame Relay flow control mechanism is used to signal routers that they should reduce the flow rate of frames?DEBECIRFECNCBIR38.Refer to the exhibit. A network administrator configures a standard access control list on Router1 to prohibit traffic from the 192.168.0.0/24 network from reaching the Internet. The access control list also permits traffic from the 192.168.0.0/24 network to reach the 192.168.1.0/24 network. On which interface and in which direction should the access control list be applied?interface Fa0/0, inboundinterface Fa0/0, outboundinterface S0/0/0, inboundinterface S0/0/0, outbound39. Which configuration on the vty lines provides the best security measure for network administrators to remotely access the core routers at headquarters?Answer: 3nd option 40.Refer to the exhibit. What can be concluded from the exhibited output of the debug ip nat command?The 10.1.1.225 host is exchanging packets with the 192.168.0.10 host.The native 10.1.200.254 address is being translated to 192.168.0.10.The 192.168.0.0/24 network is the inside network.Port address translation is in effect.41. A network administrator is instructing a technician on best practices for applying ACLs. Which suggestion should the administrator provide?Named ACLs are less efficient than numbered ACLs.Standard ACLs should be applied closest to the core layer.ACLs applied to outbound interfaces are the most efficient.Extended ACLs should be applied closest to the source that is specified by the ACL.42.Refer to the exhibit. Headquarters is connected through the Internet to branch office A and branch office B. Which WAN technology would be best suited to provide secure connectivity between headquarters and both branch offices?ATMVPNISDNFrame Relaybroadband DSL43. Which three physical network problems should be checked when a bottom-up troubleshooting approach has been chosen to troubleshoot network performance? (Choose three.)cable connectivityhigh collision countsSTP failures and loopsaddress mapping errorshigh CPU utilization ratesexcess packets that are filtered by the firewall44.Refer to the exhibit. A network administrator is attempting to configure a Frame Relay network. The administrator enters the commands as shown in the exhibit on R2, but the Frame Relay PVCs are inactive. What is the problem?The incorrect DLCI numbers are being configured on R2.The S0/0/0 interface on R2 needs to be point-to-point.The frame-relay map commands are missing the cisco keyword at the end.A single router interface cannot connect to more than one Frame Relay peer at a time.45. Which IP address and wildcard mask would be used in an ACL to block traffic from all hosts on the same subnet as host 192.168.16.43/28?access-list 10 deny 192.168.16.0 0.0.0.31access-list 10 deny 192.168.16.16 0.0.0.31access-list 10 deny 192.168.16.32 0.0.0.16access-list 10 deny 192.168.16.32 0.0.0.15access-list 10 deny 192.168.16.43 0.0.0.1646. Which combination of Layer 2 protocol and authentication should be used to establish a link without sending authentication information in plain text between a Cisco and a non-Cisco router?PPP with PAPPPP with CHAPHDLC with PAPHDLC with CHAP47. When would the multipoint keyword be used in Frame Relay PVCs configuration?when global DLCIs are in usewhen using physical interfaceswhen multicasts must be supportedwhen participating routers are in the same subnet48. A network technician analyzes the network and notices late collisions. The collisions occur accompanied by jabber that originates from the server. What is the likely cause of the problem?faulty switch portweb server CPU overloadfaulty NIC in the web servermisconfiguration of web server services49.Refer to the exhibit. R1 is performing NAT overload for the 10.1.1.0/24 inside network. Host A has sent a packet to the web server. What is the destination IP address of the return packet from the web server?10.1.1.2:1234172.30.20.1:1234172.30.20.1:3333192.168.1.2:8050.Refer to the exhibit. All devices are configured as shown in the exhibit. PC1 is unable to ping the default gateway. What is the cause of the problem?The default gateway is in the wrong subnet.STP has blocked the port that PC1 is connected to.Port Fa0/2 on S2 is assigned to the wrong VLAN.S2 has the wrong IP address assigned to the VLAN30 interface.51. When Frame Relay encapsulation is used, what feature provides flow control and exchanges information about the status of virtual circuits?LCPLMIDLCIInverse ARP52. A network administrator is tasked with maintaining two remote locations in the same city. Both locations use the same service provider and have the same service plan for DSL service. When comparing download rates, it is noticed that the location on the East side of town has a faster download rate than the location on the West side of town. How can this be explained?The West side has a high volume of POTS traffic.The West side of town is downloading larger packets.The service provider is closer to the location on the East side.More clients share a connection to the DSLAM on the West side.。
(完整版)CCNA四考试答案
窗体顶端
一家新的公司需要满足特定需要的数据网络。网络必须为分布在广阔地域中的销售人员提供低成本连接。哪两种WAN基础设施可以满足要求？（请选择两项。）
公共基础设施
私有基础设施
Internet
专用
卫星
窗体底端
答案：1和3
解析：Internet上的VPN为远程用户提供低成本的安全连接。VPN部署在Internet公共基础设施上。
3
窗体顶端
以下哪项描述了WAN的特征？
WAN和LAN在同一地理范围内运行，但有串行链路。
WAN网络归运营商所有。
所有串行链路均被视为WAN连接。
WAN可提供到园区主干网的终端用户网络连接。
窗体底端
答案：2
解析：WAN可用于将企业LAN互连到远程分支机构站点LAN和远程工作人员站点。WAN归运营商所有。虽然WAN连接一般通过串行接口实现，但并不是所有串行链路均连接至WAN。LAN（而非WAN）可在组织中提供终端用户网络连接。
12
窗体顶端
哪两种技术使用PSTN网络来提供Internet连接？（请选择两项。）
ATM
ISDN
MPLS
拨号
帧中继
窗体底端
答案：2和4
解析：拨号和ISDN使用PSTN网络来提供WAN连接。ATM、MPLS和帧中继需要服务提供商构建特定网云来支持每种技术。
13
窗体顶端
公司需要互连城市区域中的多个分支机构。网络工程师正在寻找可提供高速融合流量（包括同一网络基础设施中的语音、视频和数据）的解决方案。公司还希望能够轻松集成到其办公地点的现有LAN基础设施中。应该推荐哪种技术？
解析：Link-establishment帧负责建立和配置链路。Link-maintenance帧负责管理和调试链路。Link-termination帧负责终止链路。
EWAN Practice Final Exam
考试浏览器 - EWAN Practice Final Exam - CCNA Exploration: 接入 WAN (版本 4.0.0.0)下面是考试的考试试题以及与题目关联的评分规则。
思科网络技术学院的内容是受到版权保护的,禁止一切未经授权的张贴,分发或共享本考试的内容. 1如果将命令 ip dhcp excluded-address 172.16.4.1 172.16.4.5 添加到配置为 DHCP 服务器的本地路由器配置中么？该路由器将丢弃发往 172.16.4.1 和 172.16.4.5 的流量。
不会路由地址处于 172.16.4.1 到 172.16.4.5 之间的客户端所发出的流量。
该路由器的 DHCP 服务器功能不会分配 172.16.4.1 到 172.16.4.5 之间的地址。
该路由器将忽略来自地址处于 172.16.4.1 到 172.16.4.5 之间的 DHCP 服务器的流量。
此试题参考以下领域的内容： CCNA Exploration: 接入 WAN7.1.4 配置 DHCP 服务器2管理员正在为一台双协议栈路由器配置使用 RIPng 的 IPv6 和 IPv4。
当管理员尝试将 IPv4 路由输入 RIPng 时错误消息。
此问题的原因是什么？RIPng 与双协议栈技术不兼容。
所有接口均配置了不正确的 IPv4 地址。
除 RIPng 以外，还需要配置 RIPv1 或 RIPv2 才能成功使用 IPv4。
在同一接口同时配置 IPv4 和 IPv6 时，所有 IPv4 地址均被禁用，以支持新的技术。
此试题参考以下领域的内容： CCNA Exploration: 接入 WAN7.3.6 IPv6 的路由考虑因素 3请参见图示。
R1 会响应哪些 DHCP 请求？R1 收到的所有 DHCP 请求广播到 10.0.1.255 的请求目的地址为 10.0.1.3 的 DNS 请求FastEthernet 0/0 接口上收到的请求来自未列入排除列表的任何网络的请求此试题参考以下领域的内容：CCNA Exploration: 接入WAN∙7.1.4 配置DHCP 服务器4请参见图示。
CCNA 4 - Final Exam (C)
CCNA 4 - Final Exam (C)Posted by beotron at 9:23 PM1. Which of the following describes the roles of devices in a WAN? (Choose three.)• A CSU/DSU terminates a digital local loop.• A modem terminates a digital local loop.• A CSU/DSU terminates an analog local loop.• A modem terminates an analog local loop.• A router is commonly considered a DTE device.• A router is commonly considered a DCE device.2. What value in the address field of a Frame Relay header identifies the destination of the frame? • CIR• DE• DLCI• ISDN• FRAD• PVC3. The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue explains why the link is unable to establish a PPP session?• The IP addresses must be on different subnets.• The usernames are misconfigured.• The passwords must be different for the CHAP authentication.• The clock rate must be 56000.• The clock rate is configured on the wrong end of the link.• Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.4. The output of the show interfaces serial 0/0 command for a frame-relay connection indicates that the serial line is up but the line protocol is down. What are possible causes for this? (Choose two.)• There is an LMI-type mismatch between the Frame Relay switch and the router.• There is no clock present on the serial interface.• The interface is shut down.• RARP is not functioning on the router.• The cable is disconnected.5. Which statements are correct about the point in the network where the responsibility of the service provider ends? (Choose three.)• The International point is on the customer side of the network terminating unit(NTU).• The United States point is at the interface of the customer-provided equipment and the local loop.• The responsibility for this point is controlled by IANA.• The point is called the demarcation point.• The point is typically located at the service provider’s central office.• The point is located between the customer’s local area networks.6. While prototyping an internetwork in the corporate lab, a network administrator is testing a serial link between serial 0/0 interfaces on two routers. The labels on the serial cable ends have been damaged and are unreadable. What command can be issued to determine which router is connected to the DCE cable end?• show interfaces serial 0/0• show version• show controllers serial 0/0• show protocols serial 0/0• show status serial 0/07. A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?• The DHCP server service is not enabled.• The inside interface for DCHP is not defined.• The DHCP pool is not bound to the interface.• The pool does not have a default router defined for the clients.• All the host addresses have been excluded from the DHCP pool.8. A technician enters the interface serial 0/0.1 multipoint command when configuring a router. What effect will the multipoint keyword have in this configuration? (Choose two.)• Split-horizon issues will need to be resolved for this network if RIP is the routing protocol.• A subinterface will be defined for each PVC.• All the participating interfaces of remote routers will be configured in the same subnet.• A single DLCI will be used to define all the PVCs to the remote routers.• An IP address will need to be configured on the main interface.9. When configuring a Frame Relay connection, when should a static Frame Relay map be used? (Choose two.)• when the remote router is a non-Cisco router• whe n the remote router does not support Inverse ARP• when the local router is using IOS Release 11.1 or earlier• when broadcast traffic and multicast traffic over the PVC must be controlled• when globally significant rather than locally significant DLCIs a re being used10. Which router command would be used to associate a Layer 2 address with the corresponding Layer 3 address in the internetwork in the diagram?• RouterA(config-if)#frame-relay pvc 100 192.168.15.2• RouterA(config-if)#dialer-map ip 192.168.15.1 100 broadcast• RouterA(config-if)#frame-relay map ip 192.168.15.2 100 broadcast• RouterA (config-if)#dialer-map 192.168.15.1 101 serial 0 broadcast• RouterA (config-if)#frame-relay dlci 101 192.168.15.1 broadcast• RouterA (config-if)#dialer-map 192.168.15.1 inverse-arp broadcast11. Which of the following ISDN protocols is responsible for call setup and call teardown?• ITU-T Q.921• ITU-T Q.931• ITU-T I.430• ITU-T I.43112. What are two ways to resolve split-horizon issues in a Frame Relay network? (Choose two.)• create a full-mesh topology• disable Inverse ARP• use point-to-point subinterfaces• use multipoint subinterfaces• remove the broadcast keyword from the frame-relay map command13. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco 806 broadband router?• defines which addresses are allowed out of the router• defines which addresses are allowed into the router• defines which addresses can be translated• defines which address es are assigned to a NAT pool14. A system administrator is unable to ping the Serial0/0 interface of RouterB from RouterA. During the troubleshooting process, the following facts are established:- IP addressing and subnet masks are correct.- RouterA is a Cisco router and RouterB is a router from another vendor.- RouterA is configured with the default encapsulation.- The serial interfaces on both routers are up.- The protocol is down on the serial interfaces of both routers.What should the administrator do to solve the problem?• Add a clock rate on RouterA.• Enable the serial interface on RouterB.• Change the encapsulation on both routers to PPP.• Connect the serial cable to the correct interface on RouterB.• Use the correct serial cable to attach the CSU/DSU to RouterB.15. An ISDN circuit from a branch office is remaining connected to the regional office. A network administrator determines a user has initiated a continuous ping from a desktop computer to the regional office. Which configuration change would allow the ISDN circuit to disconnect during any attempts to ping, while otherwise functioning properly?• change DDR from legacy to dialer profiles• remove the dialer list statement from the configuration• change the dialer list to exclude IC MP as interesting• disable inverse ARP16. Below is a list of DDR steps. Which of the following identifies the proper order of DDR?1 - dial number is looked up2 - interesting traffic triggers DDR3 - route to destination is determined4 - call is made• 1,2,3,4• 1,3,2,4• 2,3,1,4• 2,1,3,4• 3,2,1,4• 3,1,2,417. Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through authentication?• NAT with DHCP• Frame Relay• HDLC with encryption• H DLC with CHAP• PPP with PAP• PPP with CHAP18. Which of the following are valid steps for a basic ISDN BRI configuration? (Choose two.)• create subinterfaces• define the LMI type• set the SPIDs if required by the ISDN switch• set the interface DLCI• set the switch type• specify the encapsulation as either Cisco or IETF19. A branch office reports excessive connect time charges for an ISDN circuit used to connect to the regional office. Upon investigation of this issue, it is discovered that when an ISDN connection is initiated to the regional office it remains connected for an excessive amount of time. Which of the following configuration changes could be made to DDR on the router to reduce these connect time charges?• use PPP multilink• lower idle timer setting• use CHAP authentication• change DDR from legacy to dialer profiles20. A network administrator is having difficulty in establishing a serial link between a Cisco router and a router from another vendor. Both routers are configured for HDLC encapsulation. Which statements are true regarding this configuration? (Choose two.)• The Cisco HDLC frame uses a proprietary “Type” field that may not be compatible with equipment of other vendors.• HDLC requires a clock rate to be configured on the r outers at both ends of the serial link.• PPP encapsulation is recommended for serial links between equipment from multiple vendors.• Usernames must be configured at both ends of the HDLC serial link.• The HDLC vendor type must be enabled on the Cisco ro uter.• There is a mismatch in the HDLC authentication password configurations.21. Given the partial router configuration in the graphic, why does the workstation with the IP address 192.168.1.153/28 fail to access the Internet? (Choose two.)• The NAT in side interfaces are not configured properly.• The NAT outside interface is not configured properly.• The router is not properly configured to use the access control list for NAT.• The NAT pool is not properly configured to use routable outside addresses.• The access control list does not include the IP address 192.168.1.153/28 to access the Internet.22. The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue will prevent IP traffic from crossing this link?• The passwords must be different for the CHAP authentication.• The usernames are misconfigured.• The clock rate must be 56000.• The clock rate is configured on the wrong end of the link.• The IP addresses must be on the same subnet.• Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.23. What causes a DDR call to be placed?• dial string• DLCI• idle time out• interesting traffic• PVC24. Which two layers of the OSI model are described by WAN standards?• Application Layer, Physical Layer• Data Link Layer, Physical Layer• Data Link Layer, Transport Layer• Physical Layer, Network Layer25. A technician is testing RouterA in the graphic. What is the condition of the circuit?• The routers are configured fo r different encapsulations.• The clock rate is not properly configured on the routers.• The circuit from WAN provider has failed.• Authentication is not properly configured on the routers.• The circuit is functioning properly.26. A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix. The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson occasionally needs to connect to the Central office for e-mail access. How should the networkadministrator connect the remote sites to the Central office? (Choose two.)• Connect to the Atlanta and Orlando remote offices with Frame Relay connections.• Connect to the Atlanta and Orlando remote offices with ISDN connections.• Connect to the Atlanta and Orlando re mote offices with POTS dial-up connections.• Connect to the Phoenix remote office with a Frame Relay connection.• Connect to the Phoenix remote office with a POTS dial-up connection.27. When a Frame Relay switch detects an excessive buildup of frames in its queue, which of the following may occur? (Choose two.)• Frames with the DE bit set are dropped from the switch queue.• Frames with the FECN and BECN bits set are dropped from the switch queue.• Frames in excess of the CIR are not accepted by the sw itch.• The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested link.• The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit o n all frames it places on the congested link.28. A system administrator is troubleshooting a connectivity issue between two routers in a new installation. The administrator enters the debug ppp authentication command on the WHSE router. The graphic shows a part of the output received. From this output, what is the most likely cause of this connectivity issue?• There is not a route to the remote router.• The ISDN circuit on the remote router has failed.• The username/password was not properly configured on the WHSE router.• The remote router has a different authentication protocol configured.29. What does the output of the show frame-relay map command shown below represent? (Choose two.) • Serial 0 (up): ip 172.30.151.4 dlci 122, dynamic, broadcast, sta tus defined, active• 172.30.151.4 represents the IP address of the remote router.• 172.30.151.4 represents the IP address of the local serial interface.• DLCI 122 represents the interface of the remote router.• broadcast indicates that a dynamic routin g protocol such as RIP v1 can send packets across this PVC. • dynamic indicates that a dynamic routing protocol is enabled for this connection.• active indicates that the ARP process is working.30. What does the status inactive indicate in the output of the show frame-relay pvc command?• The DLCI is programmed in the switch but is not usable.• The DLCI was formerly programmed in the switch but is no longer there.• The DLCI is usable but has little activity.• The DLCI has been renamed for that PVC.31. Which of the following IP addresses are defined by RFC 1918 as private addresses? (Choose three.) • 192.168.146.0/22• 172.10.25.0/16• 172.31.0.0/16• 20.0.0.0/8• 10.172.92.8/2932. After configuring a dialup ISDN circuit, a network associate begins testing the dialup connection. When attempting to ping a host on the remote network, the local router does not attempt to dial the remote access server. Which of the following are possible errors in this configuration? (Choose three.) • PPP authentication is not properly configured.• No dialer map is configured.• The ISDN circuit connected to the remote access server is busy.• No interesting traffic is defined.• No route is determined to the remote network.• A wrong number is configured in the dial string.33. Two routers are connected through a Frame Relay, point-to-point PVC. The remote router is from a vendor other than Cisco. Which interface command is required to configure the link between the Cisco router and the other router?• frame-relay pvc multipoint• frame-relay pvc point-to-point• encapsulation frame-relay cisco• encapsulation frame-relay ietf• frame-relay lmi-type ansi34. Which circuit-switched WAN technology is often used to provide a backup for a leased line and additional capacity during peak usage times?• X.25• DSL• ISDN• cable modem35. After the ISDN BRI interface is configured, which command can be used to verify that the router is communicating correctly with the ISDN switch?• show dialer• show isdn status• show interfaces b ri0/0:1• show interfaces serial0/0.136. A system administrator needs to configure the regional office with ISDN for DDR connections to three remote sites. Each remote site requires different IP subnets, different encapsulations, and different authentication methods. The sites will not be connected at the same time. The company would like to accomplish this in the most cost effective manner. What method can the system administrator use to accomplish this task using the fewest B channels?• Install and conf igure a PRI.• Install and configure a BRI interface with separate SPIDs for each remote site.• Install and configure a BRI with multiple switch types in global configuration.• Install and configure a BRI using dialer profiles.• Install and configure a separate BRI for each remote site.37. A system administrator must provide Internet connectivity for ten hosts in a small remote office. The ISP has assigned two public IP addresses to this remote office. How can the system administrator configure the router to provide Internet access to all ten users at the same time?• Configure static NAT for all ten users.• Configure dynamic NAT for ten users.• Configure dynamic NAT with PAT.• Configure DHCP and static NAT.• What the administrator wants to do cannot be done.38. Which of the following are characteristics of Frame Relay? (Choose two.)• circuit-switched• connection oriented• OSI Layer 3• packet-switched• reliable39. Which of the following is the order for the three phases of establishing a PPP serial link with authentication?• authentication, link-establishment, network layer protocols• authentication, network layer protocols, link-establishment• network layer protocols, link-establishment, authentication• network layer protocols, authenticati on, link-establishment• link-establishment, authentication, network layer protocols• link-establishment, network layer protocols, authentication。
EWAN Final Exam 思科第四学期期末答案(满分)
考试结束后的分数截图：以下为考试内容1下列哪种类型的网络攻击是利用被入侵的系统中的漏洞在网络中自我传播？病毒蠕虫特洛伊木马中间人2请参见图示。
有一个 FTP 请求数据包需要发往 IP 地址为 172.16.1.5 的 FTP 服务器。
Router1 的 S0/0/0 接口收到该请求数据包后，会以何种方式处理？路由器认定传入数据包与access-list 201 permit ip any any 命令创建的语句匹配，从而允许数据包进入路由器。
因为access-list 101 permit ip any any命令没有创建任何语句，所以路由器会达到 ACL 101 的尾部而找不到匹配的条件，从而丢弃该数据包。
路由器认定传入数据包与access-list 101 permit ip any 172.16.1.0 0.0.0.255命令创建的语句匹配，从而忽略 ACL 101 的其余的语句，允许数据包进入路由器。
路由器会认定传入数据包与命令access-list 201 deny icmp 172.16.1.0 0.0.0.255 any 创建的语句匹配，然后继续将该数据包与 ACL 201 中剩余的语句比对，以确保后续语句均未禁止 FTP，然后路由器将丢弃该数据包。
3管理员正在使用 RIPng 和双协议栈技术为一路由器配置 IPv6 和 IPv4，他在输入 IPv4 路由时收到一条错误消息。
可能是什么原因导致出现错误消息？IPv4 与 RIPng 不兼容RIPng 与双协议栈技术不兼容。
路由器接口的地址配置错误。
在同一接口同时配置 IPv4 和 IPv6 时，所有 IPv4 地址均被禁用，以支持新的技术。
4帧中继网络中所用的本地管理接口 (LMI) 提供哪两项功能？（选择两项。
）流量控制错误通知拥塞通知映射 DLCI 至网络地址发送 keepalive 数据包以检验 PVC 的工作情况5如果不以纯文本格式发送身份验证信息，在 Cisco 和非 Cisco 路由器之间建立链路连接时，应使用以下哪种第 2 层协议和身份验证的组合？HDLC 与 PAPHDLC 与 CHAPPPP 与 PAPPPP 与 CHAP6服务提供商自何处开始对客户的 WAN 连接负责？本地环路路由器上的 DTE 电缆分界点非军事区7请参见图示。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
CCNA4模拟考试-试题及答案EWAN Practice Final Exam - CCNA Exploration: 接入WAN (版本4.0)1下列哪两项是DSL 技术的特征？（选择两项。
）上传的传输速率通常高于下载速率。
服务提供商在电话网络的本地环路上部署DSL。
DSL 下载速度会因高POTS 语音流量而下降。
过滤器和分线器可以使POTS 和DSL 流量共享介质。
DSL 是共享介质，允许众多用户共享DSLAM 的可用带宽。
2下列哪三种说法正确描述 WAN 中设备的角色？（选择三项。
）CSU/DSU 用于端接本地数字环路。
调制解调器用于端接本地数字环路。
CSU/DSU 用于端接本地模拟环路。
调制解调器用于端接本地模拟环路路由器通常被视为DTE 设备。
路由器通常被视为DCE 设备。
3请参见图示。
R1 会响应哪些DHCP 请求？R1 收到的所有DHCP 请求广播到10.0.1.255 的请求目的地址为10.0.1.3 的DNS 请求FastEthernet 0/0 接口上收到的请求来自未列入排除列表的任何网络的请求4请参见图示。
为什么这两台路由器无法建立PPP 会话？用户名配置错误。
IP 地址位于不同的子网上。
时钟频率配置在链路上错误的一端。
两台路由器上的CHAP 口令必须不同。
Router1 上的serial 0/0/0 接口必须连接到Router2 的serial 0/0/1 接口。
5帧中继网络中的路由器将主机发来的消息转发出去。
路由器使用哪两种方法来确定要将消息转发到的正确虚电路？（选择路由器会将该帧转发给网络中的所有端口，然后从应答帧中获悉地址。
目的主机IP 地址内嵌在DLCI 中。
路由器会在逆向ARP 表中搜索DLCI 与IP 地址的映射情况。
搜索静态映射表。
路由器会以广播方式请求所需的IP 地址。
6管理员无法接收电子邮件。
在排查故障时，管理员能够从远程网络成功ping 通本地邮件服务器IP 地址，且可使用nsloo 件服务器名称成功解析为IP 地址。
问题最可能发生在OSI 模型的哪一层？应用层传输层网络层数据链路层7一名技术人员正在与竞争对手公司的一名同行聊天，比较两家公司的DSL 传输速率。
两家公司都处于同一个城市，使用同商的服务，且拥有相同的速率/服务计划。
为什么 A 公司报告的下载速度比 B 公司高？公司 B 的POTS 语音流量比A 公司的高。
与 A 公司相比，B 公司与更多客户共享通向DSLAM 的连接。
A 公司在分支点仅使用微型过滤器。
A 公司离服务提供商较近。
8请参见图示。
网络管理员正在将R1 添加到现有网络。
作为企业IT 流程的一部分，管理员尝试备份路由器R1 的Cisco I 收到了图中所示的输出。
然后，网络管理员尝试从控制台会话ping TFTP 服务器，但没有成功。
下一步应该采取什么措施才的原因？从R2 检验接口Fa0/0 是否工作正常。
从TFTP 服务器检验TFTP 服务器上的软件是否运行正常。
从TFTP 服务器确认TFTP 服务器是否有足够空间来容纳Cisco IOS 软件。
从控制台会话确定R1 是否有通往TFTP 服务器所在网络的路由。
9下列有关通配符掩码的说法中哪项正确？将子网掩码取反码必定能得到通配符掩码。
通配符掩码中以"1" 标识网络或子网位。
通配符掩码和子网掩码执行相同的功能。
在通配符掩码中碰到"0" 时，必须检查IP 地址位。
10请参见图示。
有一个FTP 请求需要发往IP 地址为192.168.1.5 的FTP 服务器。
Router1 的S0/0/0 接口收到该请求方式处理？（选择两项。
）认定该数据包与访问列表的条件不符。
路由器认定传入数据包与access-list 201 permit ip any any命令创建的语句匹配。
路由器认定传入数据包与access-list 101 permit ip any 192.168.1.0 0.0.0.255命令创建的语句匹配。
路由器认定传入数据包与access-list 201 deny icmp 192.168.1.0 0.0.0.255 any命令创建的语句匹配。
允许该数据包进入Router1。
11将Router1(config-ext-nacl)# permit tcp 172.16.4.0 0.0.0.255 any eq www命令应用到f0/0 接口的入站方向上会有什么会允许所有TCP 流量，但拒绝其它所有流 。
路由器会拒绝该命令，因为该命令不完整。
会允许来自172.16.4.0/24 的所有流量发往任意端口。
会允许从172.16.4.0/24 始发的流量发往所有TCP 端口80 目的地。
12请参见图示。
下列关于WAN 交换设备的说法中哪项正确？它使用多端口网间设备交换WAN 中的帧中继、ATM 或X.25 等流量。
它提供网际互连和用于连接服务提供商网络的WAN 接入接口端口。
它为数字信号提供端接并通过纠错和线路监控技术确保连接的完整性。
它将计算机产生的数字信号转换为可以在公共电话网络的模拟线路上传输的语音频率。
13在排查电子邮件服务器故障时，管理员发现服务器使用的交换机端口显示"up, line protocol up"。
管理员无法ping 通该服可能发生在OSI 模型的哪一层？应用层网络层数据链路层物理层14请参见图示。
Router1 无法与连接到此接口的对等设备通信。
根据图中所示的输出，最可能的原因是什么？接口重置LMI 类型不正确封装失败本地电缆没有插好15请参见图示。
网络管理员正尝试将路由器配置为使用SDM，但这名网络管理员无法访问路由器的SDM 接口。
此问题的原VTY 线路配置错误。
HTTP 超时策略配置错误。
身份验证方法配置错误。
用户名和口令配置错误。
16请参见图示。
当帧从ABC 公司的DC 办公室发往Orlando 办公室时，帧头地址字段中包含什么内容？路由器Orlando 的MAC 地址路由器DC 的MAC 地址192.168.1.25192.168.1.26DLCI 100DLCI 20017请参见图示。
连接到Fa0/0 的主机无法从此DHCP 服务器获取IP 地址。
debug ip dhcp server命令的输出为："DHC address pool for 10.1.1.1"。
问题出在哪里？地址10.1.1.1 已用于接口Fa0/0。
10Network 池的默认路由器不正确。
必须向Fa0/0 接口添加ip helper-address命令。
10Network 池的地址池不正确。
18请参见图示。
网络管理员在Router1 上创建一个标准访问控制列表，以禁止从网络172.16.1.0/24 访问网络172.16.2.0/2网络访问Internet。
应该在哪个路由器接口和方向上应用该列表？Fa0/0 接口，入站Fa0/0 接口，出站Fa0/1 接口，入站Fa0/1 接口，出站19如果路由器的s0/0/0 接口连接到了一台正在产生时钟信号的运行中CSU/DSU，但该点对点链路上的远端路由器未被激什么状况？show controllers命令会显示电缆类型为DCE V.35。
show interfaces s0/0/0命令会显示串行接 关闭，线路协议show controllers命令会显示电缆类型为DCE V.35。
show interfaces s0/0/0命令会显示串行接口打开，线路协show controllers命令会显示电缆类型为DTE V.35。
show interfaces s0/0/0命令会显示串行接口打开，线路协show controllers命令会显示电缆类型为DTE V.35。
show interfaces s0/0/0命令会显示串行接口关闭，线路协20网络管理员正在分析网络性能基线的数据。
下列哪一项是基线数据无法体现出来的？网络的IP 编址方案网络中利用率最高的部分网络中拥塞的区域网络不同部分的错误率21请参见图示。
假如您是网络管理员，需要使用帧中继拓扑连接两个远程站点。
要完成拓扑，应如何配置HQ 的点对点子接HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1HQ(config-subif)#frame-relay interface-dlci 203 on Serial 0/0/0.2HQ(config-subif)#frame-relay interface-dlci 301 on Serial 0/0/0.1HQ(config-subif)#frame-relay interface-dlci 302 on Serial 0/0/0.2HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on Serial 0/0/0.1 HQ(config-subif)#frame-relay map ip 172.16.2.2 203 broadcast on Serial 0/0/0.2HQ(config-subif)#frame-relay map ip 172.16.1.1 301 broadcast on Serial 0/0/0.1 HQ(config-subif)#frame-relay map ip 172.16.2.2 302 broadcast on Serial 0/0/0.222请参见图示。
正在从主机 A 将一个数据包通过R1 和R3 之间的VPN 隧道发送到主机B。
当该数据包到达R3 时，其址分别是什么？源192.168.1.2 - 目的192.168.4.2源192.168.3.1 - 目的192.168.3.2源192.168.2.1 - 目的192.168.3.2源192.168.3.1 - 目的192.168.4.223从什么物理位置起，WAN 连接从由服务提供商负责变为由用户负责？DMZ本地环路CSU/DSU分界点24请参见图示。
Router1 和Router2 分别支持数据中心不同的区域，并通过交叉电缆连接。
连接到Router1 的资源无法与连的资源相连接。
原因可能是什么？交叉电缆发生故障。
IP 地址不正确。
路 器连接存在第 2 层故障。
上层发生没有指定的问题。
有一个以太网接口不能正常工作，或两个以太网接口均不能正常工作。
25请参见图示。
分支 A 有一台Cisco 路由器，分支 B 有一台使用IETF 封装的非Cisco 路由器。
输入图中所示的命令后，法建立PVC。