思科CCNA第一学期期末考试答案Final复习课程

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CCNA第一学期各章习题及答案.doc

诶了我累了目录第二章网络通信P2-8第三章应用层功能及协议P9-14 第四章 OSI 传输层 P15-20第五章 OSI 网络层 P21-27第六章网络编址-IPv4 P28-34第七章数据链路层P35-40第八章 OSI 物理层 P41-45第九章以太网P46-51第十章网络规划和布线P52-61 第十一章配置和测试网络P62-70 第一学期末考试P71-91文档末尾返回目录第二章网络通信001 TCP/IP 网络接入层有何作用路径确定和数据包交换数据表示、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包2下列哪些陈述正确指出了中间设备在网络中的作用（选择三项）确定数据传输路径发起数据通信重新定时和重新传输数据信号发送数据流管理数据流数据流最后的终止点003 下列哪三项陈述是对局域网(LAN) 最准确的描述（选择三项）LAN 通常位于一个地域内。

此类网络由由一个组织管理。

LAN 中的不同网段之间一般通过租用连接的方式连接。

此类网络的安全和访问控制由服务提供商控制。

LAN 为同一个组织内的用户提供网络服务和应用程序访问。

此类网络的每个终端通常都连接到电信服务提供商(TSP)。

004 什么是PDU传输期间的帧损坏在目的设备上重组的数据因通信丢失而重新传输的数据包特定层的封装005 OSI 模型哪两层的功能与TCP/IP 模型的网络接入层相同（选择两项）网络层传输层物理层数据链路层会话层6请参见图示。

所示网络属于哪一类型WANMANLANWLAN7以下哪种特征正确代表了网络中的终端设备管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径008 第 4 层端口指定的主要作用是什么标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识通过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务9请参见图示。

思科期末考试答案

关闭窗口考试系统考试浏览器 - ENetwork Final Exam - CCNA Exploration: Network Fundamentals (版本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下列哪一个 OSI 层负责管理数据段？应用层表示层会话层传输层2请参见图示。

图中所示为客户端之间发送电子邮件的过程。

以下哪一列表正确地标识了图中各编号阶段使用的组件或协议？3第 4 层报头包含帮助数据传输的哪一类信息？服务端口号主机逻辑地址设备物理地址虚拟连接标识符4哪个 OSI 层提供面向连接的可靠数据通信服务？应用层表示层会话层传输层网络层5当 OSI 模型下层执行无连接协议时，通常使用什么来确认数据已收到并请求重传丢失的数据？IPUDP以太网无连接确认面向连接的上层协议或服务6下列哪三项是 CSMA/CD 的特征？（选择三项。

）设备会侦听介质，并且仅当无法检测到介质上存在其它信号时才会传输数据。

介质上的所有设备均可侦听所有通信。

设备根据配置的优先级来进行通信。

发生冲突后，引起冲突的设备会优先尝试传输数据。

发生冲突时，所有设备会在一段时间内停止传输数据，该段时间的长度随机决定。

CSMA/CD 使用令牌系统来避免冲突。

7在封装过程中，传输层添加什么标识符？源 IP 地址和目的 IP 地址源 MAC 地址和目的 MAC 地址源端口号和目的端口号源通道标识符和目的通道标识符8数据链路层有哪两项功能？（选择两项）分割和记录数据。

在源主机和目的主机上运行的程序之间进行数据交换。

控制数据如何传递到介质中。

生成信号以表示每个帧中的比特。

使用帧头和帧尾封装每个数据包，以便在本地介质中进行传输。

9请参见图示。

网络中的主机 A 和 B 正在传输层交换数据段。

下列关于此交换的陈述，哪两项是正确的？（选择两项）主机 A 正在使用 FTP 向主机 B 传输文件。

思科 CCNA 学习试题答案!!!

思科 CCNA 学习试题答案思科ccna学习试题答案CCNA课程测试一、单项选择题：1.媒体100BaseT的最大传输距离为：（）a:10MB:100mc:1000md:500M2、路由器下，由一般用户模式进入特权用户模式的命令是：（）a：enableb:configc:interfaced:router3、哪个命令可以成功测试网络：()a：router>ping192.5.5.0b：router#ping192.5.5.30c：router>ping192.5.5.256d：router#ping192.5.5.2554、介质工作在osi的哪一层（）a：物理层B：数据链路层C：网络层D：传输层5。

100BaseT的速率为（）Mbit/SA:1b:10C:100D:10006、在启用igrp协议时，所需要的参数是：()a:网络掩码b:子网号c:自治系统号d:跳数7、基本ip访问权限表的表号范围是：()a:1―100b:1-99c:100-199d:800-8998、查看路由表的命令是：()a:ShowInterface B:showrunc:showiprouted:showtable9、工作在osi第三层的设备是：()a:网卡b:路由器c:交换机d:集线器10、osi第二层数据封装完成后的名称是：()a:比特b:包c:帧d:段11.为了禁止网络210.93.105.0 FTP到网络223.8.151.0并允许其他信息传输，可以实现此功能的选项有：（）a:access-list1deny210 93.105.0.0.0.0.0.0b：access-list100denytcp210.93.105.00.0.0.255223.8.151.00.0.0.255eqftpc:access-List100Permitipanyd：access-list100denytcp210.93.105.00.0.0.255223.8.151.00.0.0.255eqftpaccess-list100permitipanyany12.路由器下“特权用户模式”的标识符为：（）a:>b:！c:#d:#配置如果）#13。

思科第一学期期末考试最新答案

要将数据包发送到远程网络，应使用哪种设备？访问交换机DHCP 服务器集线器路由器OSI 哪一层使用面向连接的协议来确保数据的可靠传输？应用层表示层会话层传输层请参见图示。

根据显示的IP 配置回答，主机 A 和主机 B 无法在本地网络外通信的原因是什么？对主机 A 分配了网络地址。

对主机 B 分配了组播地址。

主机 A 和主机 B 属于不同的网络。

对网关地址分配了广播地址。

请参见图示。

包含路由器 B 的网络遇到问题。

助理网络工程师已确定此网络的问题出在路由行什么操作可以纠正该网络问题？在接口Serial 0/0/0 上发出clock rate命令在接口Serial 0/0/1 上发出description命令在接口FastEthernet 0/0 上发出ip address命令在接口FastEthernet 0/1 上发出no shutdown命令请参见图示。

对于从主机 A 向Web 服务器发出的网页请求，正确的目的套接字数字是什么00-08-a3-b6-ce-46198.133.219.25:80C 172.18.0.0/24 is directly connected, FastEthernet0/0在Cisco IOS 设备中，启动配置文件存储于何处？闪存NVRAMRAMROM在配置路由器时，网络技术人员想要命名路由器。

输入hostname命令后，技术人员会看到下列示？Router>Router#Router(config)#Router(config-line)#下列哪三个IPv4 地址代表子网的广播？（选择三项）（主机为1）172.16.4.63 /26172.16.4.129 /26172.16.4.191 /26172.16.4.51 /27172.16.4.95 /27172.16.4.221 /27网络管理员想要限制访问路由器的特权执行模式。

管理员应该使用哪一种口令？使能aux控制台VTY请参见图示。

思科第一学期期末考试最新答案

根据显示的IP 配置回答，主机 A 和主机 B 无法在本地网络外通信的原因是什么？对主机 A 分配了网络地址。

对主机 B 分配了组播地址。

主机 A 和主机 B 属于不同的网络。

对网关地址分配了广播地址。

请参见图示。

包含路由器 B 的网络遇到问题。

管理员应该使用哪一种口令？使能aux控制台VTY请参见图示。

思科第一学期期末考试最新答案

初始配置？
FTP客户端
Tel net客户端
终端仿真程序
Web浏览器
请参见图示。哪种逻辑拓扑是对图示网络的准确描述?
广星型
环型
点对点
多路访问
3层头部包含的哪一项信息可帮助数据传输?
端口号
设备物理地址
目的主机逻辑地址
虚拟连接标符
管理员对设备做出了更改，但更改没有达到预期效果。管理员可以采取什么措施来恢复
要将数据包发送到远程网络，应使用哪种设备?
访问交换机
DHCP服务器
集线器
路由器
OSI哪一层使用面向连接的协议来确保数据的可靠传输?
应用层
表示层
会话层
传输层
请参见图示。根据显示的IP配置回答，主机A和主机B无法在本地网络外通信的原因是什么？
对主机A分配了网络地址。
对主机B分配了组播地址。
主机A和主机B属于不同的网络。
erase start- up config命令。
对网关地址分配了广播地址。
请参见图示。对于从主机A向Web服务器发出的网页请求，正确的目的套接字数字是什么
00-08-a3-b6-ce-46
198.133.219.25:80
htt p://
C 172.18.0.0/24 is directly conn ected, FastEthernet。/。
在Cisco IOS设备中，启动配置文件存储于何处?
闪存
NVRAM
RAM
ROM
在配置路由器时，网络技术人员想要命名路由器。输入示？
Router〉
Router#
Router(co nfig)#
Router(co nfig-li ne)#

思科CCNA考试答案(全)

CCNA思科考试答案（全）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。

(完整版)ccna1章节与期末答案

第一章：正确答案：2.4.5•解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。

而且对等网络也没有集中管理。

这种网络安全性更低，不可扩展，而且那些同时充当客户端和服务器的设备可能性能更差正确答案：1解析：正确答案： 3.5解析：选择网络介质的条件包括：所选介质可以成功传送信号的距离、要安装所选介质的环境、必须传输的数据量和速度以及介质和安装的成本。

正确答案：3和4解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。

正确答案：1和4解析：终端设备会发出通过网络传输的数据。

中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。

网络介质提供网络消息的传输通道。

正确答案：4解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。

内部网只描述通常仅供内部人员访问的网络区域。

当设备连接到有线网络时，有线LAN 会受BYOD（自带设备）影响。

使用大学无线LAN 的设备多为平板电脑和智能手机。

大学生主要使用无线WAN 来访问他们的手机运营商网络。

.正确答案：2解析：由于通过Internet 可以联系在线供应商，所以家庭用户通过Internet 进行网上购物。

内联网基本上是仅供内部使用的局域网。

外联网是外部合作伙伴访问组织内部特定资源的网络。

家庭用户并不一定使用LAN 来访问Internet。

例如，PC 可以通过调制解调器直接连接到ISP。

正确答案：1解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。

内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。

正确答案：2和4解析：电缆和DSL 均能实现高带宽、始终联网，并提供到主机计算机或LAN 的以太网连接。

10正确答案：2和3解析：移动电话连接需要使用移动电话网络。

卫星连接通常用于家庭或企业外部不便使用物理布线的位置。

11正确答案：2解析：当对网络资源的请求超出了可用容量时，网络就会变得拥堵。

CCNA第一学期Finalexam考试英文版答案

CCNA第一学期Finalexam考试英文版答案(R&S.)C 1A medium-sized business is researching available options for connecting to the Internet.Thecompany is looking for a high speed option with dedicated, symmetric access.Whichconnection type should the company choose?DSLdialupsatelliteleased linecable modem2What is the purpose of having a converged network?to provide high speed connectivity to all end devicesto make sure that all types of data packets will be treated equallyto achieve fault tolerance and high availability of data network infrastructure devicesto reduce the cost of deploying and maintaining thecommunication infrastructure3What characteristic of a network enables it to quickly grow to support new users andapplications without impacting the performance of the service being delivered to existing users?reliabilityscalabilityquality of serviceaccessibility4Which connection provides a secure CLI session with encryption to a Cisco switch?a console connectionan AUX connectiona Telnet connectionan SSH connection5A network technician is attempting to configure an interface by entering the followingcommand:SanJose(config)#ip address192.168.2.1255.255.255.0.The command isrejected by the device.What is the reason for this? The command is being entered from the wrong mode of operation.The command syntax is wrong.The subnet mask information is incorrect.The interface is shutdown and must be enabled before the switch will accept the IP address.6After several configuration changes are made to a router, the copy running-configurationstartup-configuration command is issued.Where will the changes be stored?flashROMNVRAMRAMthe configuration registera TFTP server7Refer to the exhibit.From global configuration mode,an administrator is attempting to create a message-of-the-day banner by using thecommand banner motd V Authorized access only!Violators will be prosecuted!V When users log in using Telnet,the banner does not appear correctly.What is the problem? The banner message is too long.The delimiting character appears in the banner message.The symbol“!”signals the end of a banner message.Message-of-the-day banners will only appear when a user logs in through the console port.8What are three characteristics of an SVI?(Choose three.) It is designed as a security protocol to protect switch ports.It is not associated with any physical interface on a switch.It is a special interface that allows connectivity by different types of media.It is required to allow connectivity by any device at any location.It provides a means to remotely manage a switch.It is associated with VLAN1by default.9A technician configures a switch with these commands: SwitchA(config)#interface vlan1SwitchA(config-if)#ip address192.168.1.1255.255.255.0 SwitchA(config-if)#no shutdownWhat is the technician configuring?Telnet accessSVIpassword encryptionphysical switchport access10In computer communication,what is the purpose of message encoding?to convert information to the appropriate form for transmissionto interpret informationto break large messages into smaller framesto negotiate correct timing for successful communication11What protocol is responsible for controlling the size of segments and the rate at whichsegments are exchanged between a web client and a web server?TCPIPHTTPEthernet12What are two benefits of using a layered network model? (Choose two.)It assists in protocol design.It speeds up packet delivery.It prevents designers from creating their own model.It prevents technology in one layer from affecting other layers.It ensures a device at one layer can function at the next higher layer.13What is the process of dividing a data stream into smaller pieces before transmission?segmentationencapsulationencodingflow control14When IPv4addressing is manually configured on a web server,which property of the IPv4configuration identifies the network and host portion for an IPv4address?DNS server addresssubnet maskdefault gatewayDHCP server address15A network administrator is troubleshootingconnectivity issues on a ing a tester,the administrator notices that the signals generated by the server NIC are distorted and not usable.In which layer of the OSI model is the error categorized?presentation layernetwork layerphysical layerdata link layer16A network engineer is measuring the transfer of bits across the company backbone for amission critical database application.The engineer notices that the network throughputappears lower than the bandwidth expected.Which three factors could influence thedifferences in throughput?(Choose three.)the amount of traffic that is currently crossing the networkthe sophistication of the encapsulation method applied to the datathe type of traffic that is crossing the networkthe latency that is created by the number of network devices that the data is crossingthe bandwidth of the WAN connection to the Internetthe reliability of the gigabit Ethernet infrastructure of the backbone17Which type of UTP cable is used to connect a PC to a switch port?consolerollovercrossoverstraight-through18What is a characteristic of the LLC sublayer?It provides the logical addressing required that identifies the device.It provides delimitation of data according to the physical signaling requirements of the medium.It places information in the frame allowing multiple Layer 3protocols to use the same network interface and media.It defines software processes that provide services to the physical layer.19What are the three primary functions provided by Layer 2data encapsulation?(Choosethree.)error correction through a collision detection methodsession control using port numbersdata link layer addressingplacement and removal of frames from the mediadetection of errors through CRC calculationsdelimiting groups of bits into framesconversion of bits into data signals20What will a host on an Ethernet network do if it receives a frame with a destination MACaddress that does not match its own MAC address?It will discard the frame.It will forward the frame to the next host.It will remove the frame from the media.It will strip off the data-link frame to check the destination IP address.21What are two actions performed by a Cisco switch? (Choose two.)building a routing table that is based on the first IP address in the frame headerusing the source MAC addresses of frames to build and maintain a MAC address tableforwarding frames with unknown destination IP addresses to the default gatewayutilizing the MAC address table to forward frames via the destination MAC addressexamining the destination MAC address to add new entries to the MAC address table22What are two examples of the cut-through switching method?(Choose two.)store-and-forward switchingfast-forward switchingCRC switchingfragment-free switchingQOS switching23Refer to the exhibit.If host A sends an IP packet to host B,what will the destination address be in the frame when it leaves host A?DD:DD:DD:DD:DD:DD172.168.10.99CC:CC:CC:CC:CC:CC172.168.10.65BB:BB:BB:BB:BB:BBAA:AA:AA:AA:AA:AA24What are two services provided by the OSI network layer?(Choose two.)performing error detectionrouting packets toward the destinationencapsulating PDUs from the transport layerplacement of frames on the mediacollision detection25What information is added during encapsulation at OSI Layer3?source and destination MACsource and destination application protocolsource and destination port numbersource and destination IP address26What are two functions of NVRAM?(Choose two.)to store the routing tableto retain contents when power is removedto store the startup configuration fileto contain the running configuration fileto store the ARP table27Refer to the exhibit.The network administrator for a small advertising company has chosen to use the192.168.5.96/27 network for internal LAN addressing.As shown in the exhibit,a static IP address is assigned to the company web server.However,the web server cannot access the Internet.The administrator verifies that local workstations with IP addresses that are assigned by a DHCP server can access the Internet,and the web server is able to ping local workstations.Which component is incorrectly configured?subnet maskDNS addresshost IP addressdefault gateway address28Why does a Layer3device perform the ANDing process on a destination IP address andsubnet mask?to identify the broadcast address of the destination networkto identify the host address of the destination hostto identify faulty framesto identify the network address of the destination network29What are the three ranges of IP addresses that are reserved for internal private use?(Choosethree.)10.0.0.0/864.100.0.0/14127.16.0.0/12172.16.0.0/12192.31.7.0/24192.168.0.0/1630Which three addresses are valid public addresses? (Choose three.)198.133.219.17192.168.1.24510.15.250.5128.107.12.117192.15.301.24064.104.78.22731What type of IPv6address is FE80::1?loopbacklink-localmulticastglobal unicast32Refer to the exhibit.On the basis of the output,which two statements about network connectivity are correct? (Choose two.)There is connectivity between this device and the device at192.168.100.1.The connectivity between these two hosts allows for videoconferencing calls.There are4hops between this device and the device at 192.168.100.1.The average transmission time between the two hosts is2 milliseconds.This host does not have a default gateway configured.33Which subnet would include the address192.168.1.96as a usable host address?192.168.1.64/26192.168.1.32/27192.168.1.32/28192.168.1.64/2934How many hosts are addressable on a network that has a mask of255.255.255.248?268141625435Which statement is true about variable-length subnet masking?Each subnet is the same size.The size of each subnet may be different,depending on requirements.Subnets may only be subnetted one additional time.Bits are returned,rather than borrowed,to create additional subnets.36Refer to the exhibit.Consider the IP address of 192.168.10.0/24that has been assigned to a high school building.The largest network in this building has100 devices.If192.168.10.0is the network number for the largest network,what would be the network number for thenext largest network,which has40devices?192.168.10.0192.168.10.128192.168.10.192192.168.10.224192.168.10.24037In what two situations would UDP be the preferred transport protocol over TCP?(Choosetwo.)when applications need to guarantee that a packet arrives intact,in sequence,and unduplicatedwhen a faster delivery mechanism is neededwhen delivery overhead is not an issuewhen applications do not need to guarantee delivery of the datawhen destination port numbers are dynamic38What important information is added to the TCP/IPtransport layer header to ensurecommunication and connectivity with a remote network device?timing and synchronizationdestination and source port numbersdestination and source physical addressesdestination and source logical network addresses39What is the TCP mechanism used in congestion avoidance? three-way handshakesocket pairtwo-way handshakesliding window40Which three statements characterize UDP?(Choose three.)UDP provides basic connectionless transport layer functions.UDP provides connection-oriented,fast transport of data at Layer 3.UDP relies on application layer protocols for error detection.UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.UDP relies on IP for error detection and recovery.UDP provides sophisticated flow control mechanisms.41Which two tasks are functions of the presentation layer? (Choose two.)compressionaddressingencryptionsession controlauthentication42Which two protocols operate at the highest layer of the TCP/IP protocol stack?(Choose two.)DNSEthernetIPPOPTCPUDP43Which two roles can a computer assume in a peer-to-peer network where a file is beingshared between two computers?(Choose two.)clientmasterserverslavetransient44What is the function of the HTTP GET message?to request an HTML page from a web serverto send error information from a web server to a web clientto upload content to a web server from a web clientto retrieve client email from an email server using TCP port11045A wireless host needs to request an IP address.What protocol would be used to process therequest?FTPHTTPDHCPICMPSNMP46When planning for network growth,where in the network should packet captures take place toassess network traffic?on as many different network segments as possibleonly at the edge of the networkbetween hosts and the default gatewayonly on the busiest network segment47When applied to a router,which command would help mitigate brute-force password attacksagainst the router?exec-timeout30service password-encryptionbanner motd$Max failed logins=5$login block-for60attempts5within6048Refer to the exhibit.An administrator is testing connectivity to a remote device with the IP address10.1.1.1.What does the output of this command indicate?Connectivity to the remote device was successful.A router along the path did not have a route to the destination.A ping packet is being blocked by a security device along the path.The connection timed out while waiting for a reply fromthe remote device.。

CCNA第一学期各章习题和参考答案.doc

CCNA第一学期各章习题和参考答案第二章网络通信1、TCP/IP网络接入层有何作用？A路径确定和数据包交换B数据表示、编码和控制C可靠性、流量控制和错误检测E将数据段划分为数据包2、下列哪些陈述正确指出了中间设备在网络中的作用？（选择三项）B发起数据通信D发送数据流F数据流最后的终止点3、下列哪三项陈述是对局域网(LAN) 最准确的描述？（选择三项）C LAN 中的不同网段之间一般通过租用连接的方式连接。

D此类网络的安全和访问控制由服务提供商控制。

F此类网络的每个终端通常都连接到电信服务提供商(TSP)。

004 什么是PDU？A传输期间的帧损坏B在目的设备上重组的数据C因通信丢失而重新传输的数据包005 OSI 模型哪两层的功能与TCP/IP 模型的网络接入层相同？（选择两项）018哪个应用层协议通常用于支持客户端与服务器之间的文件传输？A HTMLB HTTP D Telnet019哪个应用层协议中规定了Microsoft 网络中用于文件共享的服务？A DHCPB DNS D SMTP E Telnet020服务器上的应用层通常如何处理多客户端服务请求？A终止与服务的所有连接B拒绝与单一守护程序的多个连接C暂停当前连接，建立新连接第四章OSI传输层001下列哪两项是用户数据报协议(UDP) 的功能？（选择两项）A流量控制 D 面向连接E 序列和确认002请参见图示。

此Wireshark 捕获输出的第7 行中执行的是哪一项TCP 操作？A会话创建B 数据段重传C 数据传输D 会话断开003数据段的TCP 报头中为什么包含端口号？A指示转发数据段时应使用的正确路由器接口B 标识接收或转发数据段时应使用的交换机端口C确定封装数据时应使用的第3 层协议让接收主机转发数据到适当的应用程序E让接收主机以正确的顺序组装数据包004OSI 模型哪一层负责规范信息从源设备到目的设备准确可靠地流动？A应用层 B 表示层 C 会话层传输层 E 网络层005请参见图示。

CCNA第一学期各章知识题及答案解析

诶了我累了目录第二章网络通信P2-8第三章应用层功能及协议P9-14 第四章OSI传输层P15-20第五章OSI网络层P21-27第六章网络编址-IPv4 P28-34第七章数据链路层P35-40第八章OSI物理层P41-45第九章以太网P46-51第十章网络规划和布线P52-61 第十一章配置和测试网络P62-70 第一学期末考试P71-91文档末尾返回目录第二章网络通信001 TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表示、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包002下列哪些陈述正确指出了中间设备在网络中的作用？（选择三项）确定数据传输路径发起数据通信重新定时和重新传输数据信号发送数据流管理数据流数据流最后的终止点003下列哪三项陈述是对局域网(LAN) 最准确的描述？（选择三项）LAN 通常位于一个地域内。

此类网络由由一个组织管理。

LAN 中的不同网段之间一般通过租用连接的方式连接。

此类网络的安全和访问控制由服务提供商控制。

LAN 为同一个组织内的用户提供网络服务和应用程序访问。

此类网络的每个终端通常都连接到电信服务提供商(TSP)。

004 什么是PDU？传输期间的帧损坏在目的设备上重组的数据因通信丢失而重新传输的数据包特定层的封装005 OSI 模型哪两层的功能与TCP/IP 模型的网络接入层相同？（选择两项）网络层传输层物理层数据链路层会话层006请参见图示。

所示网络属于哪一类型？WANMANLANWLAN007 以下哪种特征正确代表了网络中的终端设备？管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径008 第4 层端口指定的主要作用是什么？标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识通过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务009 请参见图示。

思科期末考试答案

关闭窗口考试系统考试浏览器 - ENetwork Final Exam - CCNA Exploration: Network Fundamentals (版本 4、0)下面就是考试得考试试题以及与题目关联得评分规则。

思科网络技术学院得内容就是受到版权保护得,禁止一切未经授权得张贴,分发或共享本考试得内容、 1 下列哪一个 OSI 层负责管理数据段？应用层表示层会话层传输层标题描述最1correctness of response2 points for Option 4 0 points for any other option2请参见图示。

图中所示为客户端之间发送电子邮件得过程。

以下哪一列表正确地标识了图中各编号阶段使用得组件或协议？1、MUA2、MDA3、MTA4、SMTP5、MTA6、POP7、MDA8、MUA1、MUA2、POP3、MDA4、SMTP5、MTA6、MDA7、SMTP8、MUA1、MUA2、POP3、SMTP4、MDA5、MTA6、SMTP7、POP8、MUA1、MUA2、SMTP3、MTA4、SMTP5、MTA6、MDA7、POP8、MUA3第 4 层报头包含帮助数据传输得哪一类信息？服务端口号主机逻辑地址设备物理地址虚拟连接标识符4哪个 OSI 层提供面向连接得可靠数据通信服务？应用层表示层会话层传输层网络层5当 OSI 模型下层执行无连接协议时，通常使用什么来确认数据已收到并请求重传丢失得数据？IPUDP以太网无连接确认面向连接得上层协议或服务6下列哪三项就是 CSMA/CD 得特征？（选择三项。

）设备会侦听介质，并且仅当无法检测到介质上存在其它信号时才会传输数据。

介质上得所有设备均可侦听所有通信。

设备根据配置得优先级来进行通信。

发生冲突后，引起冲突得设备会优先尝试传输数据。

发生冲突时，所有设备会在一段时间内停止传输数据，该段时间得长度随机决定。

CSMA/CD 使用令牌系统来避免冲突。

思科第1学期期末Final-3答案

1PDU 封装的正确顺序是什么？答案说明最高分值correctness of response 2 points for Option 10 points for any other option 2此试题参考以下领域的内容：Introduction to Networks•3.3.1 数据封装2建立融合网络有何用途？为所有终端设备提供高速连接确保平等对待所有类型的数据包实现数据网络基础架构设备的容错能力和高可用性降低部署和维护通信基础设施的成本随着技术的发展，各个公司现在可以将不同的网络整合到一个平台之上，称为融合网络。

在融合网络中，语音、视频和数据通过同一网络传输，从而使人们不必再创建和维护各个单独的网络。

这也降低了提供和维护通信网络基础设施相关的成本。

答案说明最高分值答案说明最高分值correctness of response 2 points for Option 40 points for any other option 2此试题参考以下领域的内容： Introduction to Networks•1.3.1 融合网络3请参见图示。

哪个能是图中所示的公司网络的外联网？区域 A区域 B区域 C区域 D外联网是外部实体访问其他公司的数据的平台。

其形式可能是产品供应商所使用的库存服务器，也可能是外部实体用来访问当天客户数量的当前信息的 Web 服务器。

Internet 用云和区域 A 表示。

内部网通常仅供内部人员使用。

区域 B 和 D 均是内部网的示例。

答案说明最高分值 correctness of response 2 points for Option 30 points for any other option 2此试题参考以下领域的内容： Introduction to Networks•1.2.3 Internet4主机正在访问远程网络上的 Web服务器。

中间网络设备在此对话中起到哪三个作用？（请选重新生成数据信号充当客户端或服务器提供传输消息的通道应用安全设置来控制数据流出现错误时通知其他设备用作消息的源或目标中间设备负责管理数据传输，包括跟踪数据路径，出现故障时寻找备用路径并通知其他设备，以及应用安全和优先级策略。

思科第一学期期末考试考题CCNA

1Refer to the exhibit. Which Layer 2 protocol could be used inside nework A and network C?IPTCPUDPEthernet2Refer to the exhibit. Which set of devices contains only intermediary devices?A, B, D, GA, B, E, FC, D, G, IG, H, I, J3Refer to the exhibit. The headers added at each layer are shown. Which layer adds the destination and source process num ensure that data is delivered to the correct application?physical layerdata link layernetwork layertransport layer4The Layer 4 header contains which type of information to aid in the delivery of data?service port numberhost logical addressdevice physical addressvirtual connection identifier5Which fiber connector supports full-duplex Ethernet?6Which device should be used for routing a packet to a remote network?access switchDHCP serverhubrouter7Refer to the exhibit. Host A sends a frame to host C with a destination MAC address CC. The MAC address for host C is no table of switch SW1. How will SW1 handle the frame?Switch SW1 will drop the frame.Switch SW1 will forward the frame to host C.Switch SW1 will flood the frame out all ports.Switch SW1 will flood the frame out all ports except port Fa0/1.8Refer to the exhibit. A network technician has made several changes to R1 since the configuration has last been saved. Th configuration did not produce the desired changes. The technician wants to store a backup copy of the saved configurationserver before reloading. Which action will cause the unmodified data to be saved on the TFTP server?9Which three statements are true about network layer addressing? (Choose three.)It uniquely identifies each host.It assists in forwarding packets across internetworks.It uses a logical 32-bit IPv4 address.It is not a configurable address.It is a physical address.It identifies the host from the first part of the address.10What is the result of using the clock rate 56000 command at the serial interface of the router?The interface is configured as a DCE device.The interface timers are cleared.The FastEthernet interface is made to emulate a serial interface by assigning it a timing signal.The IP address for the serial interface is configured.11Examine the graphic with current configurations. Host A in the Clerical office failed and was replaced. Although a ping to 12 successful, the replacement computer cannot access the company network. With proxy ARP disabled on the Fa0/0 interfac York router, what is the likely cause of the problem?network card failurenetwork cables unpluggedIP address incorrectly enteredsubnet mask incorrectly entered12As network administrator, what is the subnet mask that allows 510 hosts given the IP address 172.30.0.0?255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.12813Which OSI layer uses a connection-oriented protocol to ensure reliable delivery of data?application layerpresentation layersession layertransport layer14 A network has grown too large for technicians to configure network addresses and hosts files for name resolution. Which twlayer services should be added to the server to allow these needs to be satisfied dynamically? (Choose two.)DNSFTPDHCPHTTPSMTP15Refer to the exhibit. Host A wants to access the Internet. Which combination of a Layer 2 address and a Layer 3 address w access from host A?Destination MAC: 0030.8596.DE83 Default gateway: 209.165.202.130Destination MAC: 0030.8596.DE82 Default gateway: 172.16.9.2Destination MAC: 0030.8517.44C4 Default gateway: 172.16.1.1Destination MAC: 0030.8517.44C4 Default gateway: 209.165.202.13016 A network administrator is asked to design a new addressing scheme for a corporate network. There are 60 users in the musers in the branch office, 28 users in manufacturing, 12 in the sales office, and 4 users in the research office. Which VLSM scheme that uses the 192.168.88.0/24 network will fulfill the requirements while wasting the fewest addresses?192.168.88.0/26 main192.168.88.64/26 manufacturing192.168.88.96/27 sales192.168.88.128/28 research192.168.88.0/26 main192.168.88.128/27 manufacturing192.168.88.160/28 sales192.168.88.176/29 research192.168.88.0/27 main192.168.88.64/28 manufacturing192.168.88.80/29 sales192.168.88.88/30 research192.168.88.0/27 main192.168.88.80/28 manufacturing192.168.88.96/29 sales192.168.88.104/30 research17Which physical connector type is used for a serial V.35 connection to the CSU/DSU?18Refer to the exhibit. Which two facts can be determined about the topology? (Choose two.)Four collision domains are present.One logical network is represented.Two broadcast domains are present.Three networks are needed.Three logical address ranges are required.19What are three characteristics of CSMA/CD? (Choose three.)It monitors the media for presence of a data signal.After detecting a collision, hosts can resume transmission after a random timer has expired.A jam signal is used to ensure that all hosts are aware that a collision has occurred.Devices can be configured with a higher transmission priority.Data is transmitted only when the data signal is present.It uses a token system to avoid collisions.20Refer to the exhibit. The serial interface of the router was configured with the use of the commands that are shown. The rou ping the router that is directly connected to interface serial 0/0/0. What should the network technician do to solve this probleConfigure the description at interface serial 0/0/0.Configure an IP address on interface serial 0/0/0.Remove the no shutdown command at interface serial 0/0/0Reboot the router.21Which OSI layer uses the header information to reassemble the data segments into streams?application layernetwork layerpresentation layersession layertransport layer22Refer to the exhibit. The NAT functionality of the router is enabled to provide Internet access to the PC. However, the PC is access the Internet. Which IP address should be changed to 209.165.201.1 to enable the PC to access the Internet?192.168.1.191192.168.1.101192.168.1.1192.168.1.25423Refer to the exhibit. A technician uses the nslookup command on the PC and views the output that is displayed in the exhib IP address of the primary domain name server used by the host?10.10.10.32192.168.1.5192.168.1.99192.168.2.10024Which memory contents will change as a result of using the Router# erase startup-config command on a router?RAMROMflashNVRAM25While configuring a router, a network technician wants to name the router. Which prompt should the technician see when e hostname command?Router>Router#Router(config)#Router(config-line)#26Refer to the exhibit. The PC, the routing table of which is displayed, is configured correctly. To which network device or inte IP address 192.168.1.254 belong?PCswitchrouter interface fa0/0router interface fa0/127Refer to the exhibit. A network administrator is troubleshooting a link that is down between Router1 and Router2. To correc which wire pairs need to be switched on one of the Ethernet cable ends?pair 1 and pair 2pair 1 and pair 3pair 2 and pair 3pair 2 and pair 428Refer to the exhibit. A PC is connected to a network. Which action will verify that the PC can communicate with its default gUse the ping 127.0.0.1 command.Use the ipconfig command.Use the ipconfig/all command.Use the ping 10.0.0.254 command.29Refer to the exhibit. Host B was powered off. What change will occur in the MAC table of the switch?The table will remain unaffected.The switch will remove the MAC address at Fa0/19.The switch will retain the MAC address until host B is powered on again.The switch will rebuild the MAC table by assigning the FFFF.FFFF.FFFF address to port Fa0/19.30What information is contained in the header of Layer 3 to help data delivery?port numberdevice physical addressdestination host logical addressvirtual connection identifier31 A network technician is tasked with setting up a network for six users, but the users should be able to use their accounts toany of the six computers. What type of network should be used?workgroupP2P applicationspeer-to-peer networkclient-server network32Refer to the exhibit. A web browser is running on host PC1 with an IP address 10.10.2.2/24. A dynamic port number of 4915 to the browser. The browser sends a request for a web page to the web server with an IP address 192.168.1.254/24. Which true?The session is established using TCP, and the socket number for the web server is 192.168.1.254: 80.The session is established using TCP, and the socket number for the web server is 192.168.1.254: 49152.The session is established using UDP, and the socket number for the web server is 192.168.1.254: 80.The session is established using UDP, and the socket number for the web server is 192.168.1.254: 49152.33Refer to the exhibit. An administrator on PC1 wants to view some HTML code from a web page housed on the web server. application will allow this request to be started?34Refer to the exhibit. What is required on host A for a network technician to create the initial configuration on Router1?an FTP clienta Telnet clienta terminal emulation programa web browser35What are two characteristics of the data link layer? (Choose two.)It segments and reorders the data.It exchanges the frames between nodes.It defines the method by which network devices place data onto the media.It manages the transfer of data between the processes that run on each host.It retrieves signals from the media and restores them to their bit representations.36 A network administrator wants to restrict access to the router privileged EXEC mode. Which password should the administrenableauxconsoleVTY37Which three IPv4 addresses represent a broadcast for a subnet? (Choose three.)172.16.4.63 /26172.16.4.129 /26172.16.4.191 /26172.16.4.51 /27172.16.4.95 /27172.16.4.221 /2738Refer to the exhibit. Host X is unable to communicate with host Y. Which command can be run at host X to determine whic device is responsible for this failure?telnet 192.168.1.1ping 192.168.1.1ftp 192.168.1.1tracert 192.168.1.139Refer to the exhibit. Which option shows the correct topology given the configuration of Router1?40If an administrator wished to return a router to the default state, what additional step must be taken after issuing the comma start-up config?Reload the device.Issue the command copy running-config start-up config.Perform a show running-config to verify that the file was removed.Enter the interface commands to allow the device to connect to the network.41By using the ipconfig command, a network administrator determines that a workstation has the address 192.168.3.38 with the subnet mask. To what network does the workstation belong?192.168.3.8192.168.3.16192.168.3.24192.168.3.3242Which statement is true about router hostnames?A hostname should be unique on each router.A router hostname cannot contain capital letters.A router hostname is configured in privileged executive mode.A router hostname must be created before any other configurations can be added to the device.43 A user types the enable command. What task can be performed at the privileged EXEC mode?Configure the device.Configure individual interfaces.Configure individual terminal lines.Issue show and debug commands.44Refer to the exhibit. Which logical topology describes the exhibited network?starringpoint-to-pointmulti-access45Refer to the exhibit. A user wants to access the Internet from the PC. A part of the running configuration of the router is sho default gateway IP address should be configured at the PC to enable this access?10.1.192.110.1.192.210.1.192.54192.31.7.146Which statement is true about the ICMP protocol?It is an application layer protocol.It is designed to make IP a reliable protocol.It is often filtered out of networks for security purposes.If a host does not respond to an ICMP echo request, the host is not functioning.47Refer to the exhibit. At which OSI layer is serial interface 0/0/1 experiencing problems?Layer 1Layer 2Layer 3Layer 448Refer to the exhibit. The host was disconnected from switch 2 and connected to switch 1. Which combination of IP address, and default gateway should be assigned to this host to allow it to function in the network?IP address: 10.10.9.37 Subnet mask: 255.255.255.240 Default gateway: 10.10.9.35IP address: 10.10.9.37 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.35IP address: 10.10.9.29 Subnet mask: 255.255.255.248 Default gateway: 10.10.9.35IP address: 10.10.9.32 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.35IP address: 10.10.9.37 Subnet mask: 255.255.255.224 Default gateway: 196.1.105.6IP address: 10.10.9.63 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.3549Refer to the exhibit. The diagram represents the process of sending email between clients. Select the list below that correc the component or protocol used at each numbered stage of the diagram.1.MUA2.MDA3.MTA4.SMTP5.MTA6.POP7.MDA8.MUA1.MUA2.POP3.MDA4.SMTP5.MTA6.MDA7.SMTP8.MUA1.MUA2.POP3.SMTP4.MDA5.MTA6.SMTP7.POP8.MUA1.MDA2.SMTP3.MTA4.SMTP5.MTA6.MUA7.POP8.MDA1.MUA2.SMTP3.MTA4.SMTP5.MTA6.MDA7.POP8.MUA50What is the Cisco IOS?system software for Cisco devicesRead Only Memory in Cisco devicesnon-volatile storage for device configurationsan initial operating system that is used for boot functions。

ccna1章节与期末答案

第一章：正确答案：2.4.5解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。

而且对等网络也没有集中管理。

正确答案：3和4解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。

正确答案：1和4解析：终端设备会发出通过网络传输的数据。

中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。

网络介质提供网络消息的传输通道。

正确答案：4解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。

内部网只描述通常仅供内部人员访问的网络区域。

当设备连接到有线网络时，有线LAN 会受BYOD（自带设备）影响。

使用大学无线LAN 的设备多为平板电脑和智能手机。

大学生主要使用无线WAN 来访问他们的手机运营商网络。

.正确答案：2解析：由于通过Internet 可以联系在线供应商，所以家庭用户通过Internet 进行网上购物。

内联网基本上是仅供内部使用的局域网。

外联网是外部合作伙伴访问组织内部特定资源的网络。

家庭用户并不一定使用LAN 来访问Internet。

例如，PC 可以通过调制解调器直接连接到ISP。

正确答案：1解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。

内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。

正确答案：2和4解析：电缆和DSL 均能实现高带宽、始终联网，并提供到主机计算机或LAN 的以太网连接。

10正确答案：2和3解析：移动电话连接需要使用移动电话网络。

卫星连接通常用于家庭或企业外部不便使用物理布线的位置。

11正确答案：2解析：当对网络资源的请求超出了可用容量时，网络就会变得拥堵。

CCNAS SECURITY FINAL 100% 思科安全课程final答案

Take Assessment - CCNAS Final Exam - CCNA Security: Implementing Network Security (Version 1.0)Time Remaining:02:38:471Which statement describes the operation of the IKE protocol?It uses IPsec to establish the key exchange process.It uses sophisticated hashing algorithms to transmit keys directly across a network.It calculates shared keys based on the exchange of a series of data packets.It uses TCP port 50 to exchange IKE information between the security gateways.2Which statement describes a factor to be considered when configuring a zone-based policy firewall?An interface can belong to multiple zones.The router always filters the traffic between interfaces in the same zone.The CBAC ip inspect command can coexist with ZPF as long as it is used on interfaces that are in the same security zones.A zone must be configured with the zone security global command before it can be used in the zone-member security command.3What are two disadvantages of using network IPS? (Choose two.)Network IPS has a difficult time reconstructing fragmented traffic to determine if an attack was successful.Network IPS is incapable of examining encrypted traffic.Network IPS is operating system-dependent and must be customized for each platform.Network IPS is unable to provide a clear indication of the extent to which the network is being attacked.Network IPS sensors are difficult to deploy when new networks are added.4Which three security services are provided by digital signatures? (Choose three.)authenticates the sourceauthenticates the destinationguarantees data has not changed in transitprovides nonrepudiation of transactionsprovides nonrepudiation using HMAC functionsprovides confidentiality of digitally signed data5Which three statements describe zone-based policy firewall rules that govern interface behavior and the traffic moving between zone mem (Choose three.)An interface can be assigned to multiple security zones.Interfaces can be assigned to a zone before the zone is created.Pass, inspect, and drop options can only be applied between two zones.If traffic is to flow between all interfaces in a router, each interface must be a member of a zone.Traffic is implicitly prevented from flowing by default among interfaces that are members of the same zone.To permit traffic to and from a zone member interface, a policy allowing or inspecting traffic must be configured between that zone a zone.6Which type of SDM rule is created to govern the traffic that can enter and leave the network based on protocol and port number?NAC ruleNAT ruleIPsec ruleaccess rule7Which three types of views are available when configuring the Role-Based CLI Access feature? (Choose three.)superuser viewroot viewsuperviewCLI viewadmin viewconfig view8Which two statements match a type of attack with an appropriate example? (Choose two.)To conduct an access attack, an attacker uses L0phtCrack to obtain a Windows server password.To conduct an access attack, an attacker uses Wireshark to capture interesting network traffic.To conduct a reconnaissance attack, an attacker initiates a ping of death attack to a targeted server.To conduct a DoS attack, an attacker uses handler systems and zombies to obtain a Windows server password.To conduct a DoS attack, an attacker initiates a smurf attack by sending a large number of ICMP requests to directed broadcast addTo conduct a reconnaissance attack, an attacker creates a TCP SYN flood causing the server to spawn many half-open connections unresponsive.9Which statement describes configuring ACLs to control Telnet traffic destined to the router itself?The ACL must be applied to each vty line individually.The ACL is applied to the Telnet port with the ip access-group command.Apply the ACL to the vty lines without the in or out option required when applying ACLs to interfaces.The ACL should be applied to all vty lines in the in direction to prevent an unwanted user from connecting to an unsecured port.10Refer to the exhibit. When configuring SSH on a router using SDM from the Configure menu, which two steps are required? (Choose twoChoose Additional Tasks > Router Access > SSH to generate the RSA keys.Choose Additional Tasks > Router Access > VTY to specify SSH as the input and output protocol.Choose Additional Tasks > Router Properties > Netflow to generate the RSA keys.Choose Additional Tasks > Router Properties > Logging to specify SSH as the input and output protocol.Choose Additional Tasks > Router Access > AAA to generate the RSA keys.Choose Additional Tasks > Router Access > Management Access to specify SSH as the input and output protocol.11Refer to the exhibit. Based on the output from the show secure bootset command on router R1, which three conclusions can be drawn IOS Resilience? (Choose three.)A copy of the Cisco IOS image file has been made.A copy of the router configuration file has been made.The Cisco IOS image file is hidden and cannot be copied, modified, or deleted.The Cisco IOS image filename will be listed when the show flash command is issued on R1.The copy tftp flash command was issued on R1.The secure boot-config command was issued on R1.12Which three OSI layers can be filtered by a stateful firewall? (Choose three.)Layer 2Layer 3Layer 4Layer 5Layer 6Layer 713What is an important difference between network-based and host-based intrusion prevention?Host-based IPS is more scalable than network-based IPS.Host-based IPS can work in promiscuous mode or inline mode.Network-based IPS is better suited for inspection of SSL and TLS encrypted data flows.Network-based IPS provides better protection against OS kernel-level attacks on hosts and servers.Network-based IPS can provide protection to hosts without the need of installing specialized software on each one.14What will be disabled as a result of the no service password-recovery command?aaa new-model global configuration commandchanges to the configuration registerpassword encryption serviceability to access ROMmon15Which function does an IPS perform?It passively monitors the traffic on a network.It works in inline mode for processing all ingress and egress traffic.It compares the captured traffic stream with known malicious signatures in an offline manner.It can only send an alarm to the management console when malicious traffic is detected.16Refer to the exhibit. An administrator has entered the commands that are shown on router R1. At what trap level is the logging function s235617What are access attacks?attacks that prevent users from accessing network servicesattacks that modify or corrupt traffic as that traffic travels across the networkattacks that exploit vulnerabilities to gain access to sensitive informationattacks that involve the unauthorized discovery and mapping of systems, services, and vulnerabilities18Which mitigation technique can help prevent MAC table overflow attacks?root guardBPDU guardstorm controlswitchport security19Which three major subpolicies should comprise a comprehensive security policy that meets the security needs of a typical enterprise? (Cend-user policiesdepartmental policiesgoverning policieshuman resource policiesorganizational policiestechnical policies20Which three statements describe SSL-based VPNs? (Choose three.)Asymmetric algorithms are used for authentication and key exchange.It is impossible to configure SSL and IPsec VPNs concurrently on the same router.Special-purpose client software is required on the client machine.Symmetric algorithms are used for bulk encryption.The authentication process uses hashing technologies.The application programming interface is used to extensively modify the SSL client software.The primary restriction of SSL VPNs is that they are currently supported only in hardware.21Refer to the exhibit. Which Cisco IOS security feature is implemented on router R2?CBAC firewallreflexive ACL firewallzone-based policy firewallAAA access control firewall22When port security is enabled on a Cisco Catalyst switch, what is the default action when the maximum number of allowed MAC addresseThe violation mode for the port is set to restrict.The MAC address table is cleared, and the new MAC address is entered into the table.The port remains enabled, but the bandwidth is throttled until the old MAC addresses are aged out.The port is shut down.23Which two protocols allow SDM to gather IPS alerts from a Cisco ISR router? (Choose two.)FTPHTTPSSDEESSHSyslogTFTP24Which three statements describe limitations in using privilege levels for assigning command authorization? (Choose three.)There is no access control to specific interfaces on a router.The root user must be assigned to each privilege level defined.Commands set on a higher privilege level are not available for lower privileged users.Views are required to define the CLI commands that each user can access.Creating a user account that needs access to most but not all commands can be a tedious process.It is required that all 16 privilege levels be defined, whether they are used or not.25Which device supports the use of SPAN to enable monitoring of malicious activity?Cisco NACCisco IronPortCisco Security AgentCisco Catalyst switch26Which two statements describe appropriate general guidelines for configuring and applying ACLs? (Choose two.)Multiple ACLs per protocol and per direction can be applied to an interface.If an ACL contains no permit statements, all traffic is denied by default.The most specific ACL statements should be entered first because of the top-down sequential nature of ACLs.Standard ACLs are placed closest to the source, whereas Extended ACLs are placed closest to the destination.If a single ACL is to be applied to multiple interfaces, it must be configured with a unique number for each interface.27Refer to the exhibit. Which AAA command logs the activity of a PPP session?aaa accounting connection start-stop group radiusaaa accounting connection start-stop group tacacs+aaa accounting exec start-stop group radiusaaa accounting exec start-stop group tacacs+aaa accounting network start-stop group radiusaaa accounting network start-stop group tacacs+28What login enhancement configuration command helps prevent successive login DoS attacks?exec-timeoutlogin block-forprivilege exec levelservice password-encryption29Which access list statement permits HTTP traffic that is sourced from host 10.1.129.100 port 4300 and destined to host 192.168.30.10?access-list 101 permit tcp any eq 4300access-list 101 permit tcp 192.168.30.10 0.0.0.0 eq 80 10.1.0.0 0.0.255.255access-list 101 permit tcp 10.1.129.0 0.0.0.255 eq www 192.168.30.10 0.0.0.0 eq wwwaccess-list 101 permit tcp 10.1.128.0 0.0.1.255 eq 4300 192.168.30.0 0.0.0.15 eq wwwaccess-list 101 permit tcp host 192.168.30.10 eq 80 10.1.0.0 0.0.255.255 eq 430030Refer to the exhibit. A network technician has entered the commands that are shown on router R1. However, the authentication with the N What is a possible cause?The NTP key value does not meet the MD5 requirements.Authentication has not been enabled on R1.The NTP key numbers have to match on R1.The NTP server has to be specified on R1.31Refer to the exhibit. Which type of VPN is implemented?remote-access GRE VPNremote-access IPsec VPNremote-access SSL VPNsite-to-site GRE VPNsite-to-site IPsec VPNsite-to-site SSL VPN32Refer to the exhibit. Which three things occur if a user attempts to log in four times within 10 seconds using an incorrect password? (ChoSubsequent virtual login attempts from the user are blocked for 60 seconds.During the quiet mode, an administrator can virtually log in from any host on network 172.16.1.0/24.Subsequent console login attempts are blocked for 60 seconds.A message is generated indicating the username and source IP address of the user.During the quiet mode, an administrator can log in from host 172.16.1.2.No user can log in virtually from any host for 60 seconds.33 A network technician is configuring SNMPv3 and has set a security level of auth. What is the effect of this setting?authenticates a packet using the SHA algorithm onlyauthenticates a packet by a string match of the username or community stringauthenticates a packet by using either the HMAC with MD5 method or the SHA methodauthenticates a packet by using either the HMAC MD5 or HMAC SHA algorithms and encrypts the packet using either the DES, 3D algorithms34What is a result of securing the Cisco IOS image using the Cisco IOS Resilient Configuration feature?The Cisco IOS image file is not visible in the output of the show flash command.The Cisco IOS image is encrypted and then automatically backed up to a TFTP server.The Cisco IOS image is encrypted and then automatically backed up to the NVRAM.When the router boots up, the Cisco IOS image is loaded from a secured FTP location.35Refer to the exhibit. What information can be obtained from the AAA configuration statements?The authentication method list used for Telnet is named ACCESS.The authentication method list used by the console port is named ACCESS.The local database is checked first when authenticating console and Telnet access to the router.If the TACACS+ AAA server is not available, no users can establish a Telnet session with the router.If the TACACS+ AAA server is not available, console access to the router can be authenticated using the local database.36Which three additional precautions should be taken when remote access is required in addition to local access of networking devices? (CA legal notice should not be displayed when access is obtained.All activity to the specified ports that are required for access should be unrestricted.All configuration activities should require the use of SSH or HTTPS.All administrative traffic should be dedicated to the management network.The number of failed login attempts should not be limited, but the time between attempts should.Packet filtering should be required so that only identified administration hosts and protocols can gain access.37What occurs after RSA keys are generated on a Cisco router to prepare for secure device management?All vty ports are automatically configured for SSH to provide secure management.The general-purpose key size must be specified for authentication with the crypto key generate rsa general-keys modulus commThe keys must be zeroized to reset secure shell before configuring other parameters.The generated keys can be used by SSH.38The use of which two options are required for IPsec operation? (Choose two.)AH protocols for encryption and authenticationDiffie-Hellman to establish a shared-secret keyIKE to negotiate the SAPKI for pre-shared-key authenticationSHA for encryption39Which two guidelines relate to in-band network management? (Choose two.)Apply in-band management only to devices that must be managed on the production network.Implement separate network segments for the production network and the management network.Attach all network devices to the same management network.Use IPSec, SSH, or SSL.Deploy a terminal server with console connections to each network device.40Which two statements are characteristics of the IPsec protocol? (Choose two)IPsec is a framework of open standards.IPsec is implemented at Layer 4 of the OSI model.IPsec ensures data integrity by using a hash algorithm.IPsec uses digital certificates to guarantee confidentiality.IPsec is bound to specific encryption algorithms, such as 3DES and AES.41Which element of the Cisco Threat Control and Containment solution defends against attempts to attack servers by exploiting application system vulnerabilities?threat control for emailthreat control for endpointsthreat control for infrastructurethreat control for systems42Refer to the exhibit. Based on the IPS configuration that is provided, which statement is true?The signatures in all categories will be retired and not be used by the IPS.The signatures in all categories will be compiled into memory and used by the IPS.Only the signatures in the ios_ips basic category will be compiled into memory and used by the IPS.The signatures in the ios_ips basic category will be retired and the remaining signatures will be compiled into memory and used by43Which two Cisco IPS management and monitoring tools are examples of GUI-based, centrally managed IPS solutions? (Choose two.)Cisco Adaptive Security Device ManagerCisco IPS Device ManagerCisco Router and Security Device ManagerCisco Security ManagerCisco Security Monitoring, Analysis, and Response System44What are three common examples of AAA implementation on Cisco routers? (Choose three.)authenticating administrator access to the router console port, auxiliary port, and vty portsauthenticating remote users who are accessing the corporate LAN through IPsec VPN connectionsimplementing public key infrastructure to authenticate and authorize IPsec VPN peers using digital certificatesimplementing command authorization with TACACS+securing the router by locking down all unused servicestracking Cisco Netflow accounting statistics45Which action best describes a MAC address spoofing attack?altering the MAC address of an attacking host to match that of a legitimate hostbombarding a switch with fake source MAC addressesforcing the election of a rogue root bridgeflooding the LAN with excessive traffic46Refer to the exhibit. An administrator is configuring ZPF using the SDM Basic Firewall Configuration wizard. Which command is generate administrator selects the Finish button?zone security Out-zone on interface Fa0/0zone security Out-zone on interface S0/0/0zone-member security Out-zone on interface Fa0/0zone-member security Out-zone on interface S0/0/047An organization requires that individual users be authorized to issue specific Cisco IOS commands. Which AAA protocol supports this reTACACS+ because it separates authentication and authorization, allowing for more customization.RADIUS because it supports multiple protocols, including ARA and NetBEUI.TACACS+ because it supports extensive accounting on a per-user or per-group basis.RADIUS because it implements authentication and authorization as one process.48Which three principles are enabled by a Cisco Self-Defending Network? (Choose three.)adaptabilitycollaborationinsulationintegrationmitigationscalability49Refer to the exhibit. Which interface configuration completes the CBAC configuration on router R1?R1(config)# interface fa0/0R1(config-if)# ip inspect INSIDE inR1(config-if)# ip access-group OUTBOUND inR1(config)# interface fa0/1R1(config-if)# ip inspect INSIDE inR1(config-if)# ip access-group OUTBOUND inR1(config)# interface fa0/1R1(config-if)# ip inspect OUTBOUND inR1(config-if)# ip access-group INSIDE outR1(config)# interface fa0/0R1(config-if)# ip inspect OUTBOUND inR1(config-if)# ip access-group INSIDE inR1(config)# interface fa0/1R1(config-if)# ip inspect OUTBOUND inR1(config-if)# ip access-group INSIDE in50Which three statements should be considered when applying ACLs to a Cisco router? (Choose three.)Place generic ACL entries at the top of the ACL.Place more specific ACL entries at the top of the ACL.Router-generated packets pass through ACLs on the router without filtering.ACLs always search for the most specific entry before taking any filtering action.A maximum of three IP access lists can be assigned to an interface per direction (in or out).An access list applied to any interface without a configured ACL allows all traffic to pass.51What precaution should be considered when the no service password-recovery command has been issued on an IOS device?The passwords in the configuration files are in clear text.IOS recovery requires a new system flash with the IOS image.When the password is lost, access to the device will be terminated.The device must use simple password authentication and cannot have user authentication.52Which three statements describe the IPsec protocol framework? (Choose three.)AH uses IP protocol 51.AH provides encryption and integrity.AH provides integrity and authentication.ESP uses UDP protocol 50.ESP requires both authentication and encryption.ESP provides encryption, authentication, and integrity.53Refer to the exhibit. An administrator has configured router R1 as indicated. However, SDEE messages fail to log. Which solution correctIssue the logging on command in global configuration.Issue the ip ips notify sdee command in global configuration.Issue the ip audit notify log command in global configuration.Issue the clear ip ips sdee events command to clear the SDEE buffer.54Which command would an administrator use to clear generated crypto keys?Router(config)# crypto key decryptRouter(config-line)# transport input ssh clearRouter(config)# crypto key rsaRouter(config)# crypto key zeroize rsa55Refer to the exhibit. Which two statements are correct regarding the configuration on switch S1? (Choose two.)Port Fa0/5 storm control for broadcasts will be activated if traffic exceeds 80.1 percent of the total bandwidth.Port Fa0/6 storm control for multicasts and broadcasts will be activated if traffic exceeds 2,000,000 packets per second.Port Fa0/6 storm control for multicasts will be activated if traffic exceeds 2,000,000 packets per second.Port Fa0/5 storm control for multicasts will be activated if traffic exceeds 80.1 percent of the total bandwidth.Port Fa0/5 storm control for broadcasts and multicasts will be activated if traffic exceeds 80.1 percent of 2,000,000 packets per sec56What functionality is provided by Cisco SPAN in a switched network?It mitigates MAC address overflow attacks.It prevents traffic on a LAN from being disrupted by a broadcast storm.It mirrors traffic that passes through a switch port or VLAN to another port for traffic analysis.It protects the switched network from receiving BPDUs on ports that should not be receiving them.It inspects voice protocols to ensure that SIP, SCCP, H.323, and MGCP requests conform to voice standards.It copies traffic that passes through a switch interface and sends the data directly to a syslog or SNMP server for analysis.57Which three commands are required to configure SSH on a Cisco router? (Choose three.)ip domain-name name in global configuration modetransport input ssh on a vty lineno ip domain-lookup in global configuration modepassword password on a vty lineservice password-encryption in global configuration modecrypto key generate rsa in global configuration mode58Refer to the exhibit. Based on the SDM screen shown, which two conclusions can be drawn about the IKE policy being configured? (ChoIt will use digital certificates for authentication.It will use a predefined key for authentication.It will use a very strong encryption algorithm.It will be the default policy with the highest priority.It is being created using the SDM VPN Quick Setup Wizard.59Which statement describes the SDM Security Audit wizard?After the wizard identifies the vulnerabilities, the SDM One-Step Lockdown feature must be used to make all security-related configuAfter the wizard identifies the vulnerabilities, it automatically makes all security-related configuration changes.The wizard autosenses the inside trusted and outside untrusted interfaces to determine possible security problems that might exist.The wizard is based on the Cisco IOS AutoSecure feature.The wizard is enabled using the Intrusion Prevention task.60What is a feature of the TACACS+ protocol?It combines authentication and authorization as one process.It encrypts the entire body of the packet for more secure communications.It utilizes UDP to provide more efficient packet transfer.It hides passwords during transmission using PAP and sends the rest of the packet in plaintext.。

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1下列哪个端口号范围为服务器上运行的应用程序常用的服务而保留？0 到2550 到10231024 到4915149152 到655352以下哪组网络ID 和子网掩码正确标识了从172.16.128.0 到172.16.159.255 的所有IP 地址？172.16.128.0 255.255.255.224172.16.128.0 255.255.0.0172.16.128.0 255.255.192.0172.16.128.0 255.255.224.0172.16.128.0 255.255.255.1923以下哪个OSI 协议层提供面向连接的可靠数据通信服务？应用层演示文稿会话传输层network4何时必须使用clock rate命令配置路由器串行接口？当该接口充当DTE 设备时当该接口计时器已经清除时当连接的DTE 设备关闭时当该接口充当DCE 设备时5下列哪些是私有IP 地址的地址范围？（选择三项。

）10.0.0.0 到10.255.255.255200.100.50.0 到200.100.25.255150.150.0.0 到150.150.255.255172.16.0.0 到172.31.255.255192.168.0.0 到192.168.255.255127.16.0.0 到127.31.255.2556请参见图示。

每条介质链路都已标记。

应该使用哪种类型的电缆连接不同设备？连接 1 - 全反电缆连接 3 - 交叉电缆连接 1 - 交叉电缆连接 3 - 交叉电缆连接 1 - 直通电缆连接 3 - 交叉电缆连接 1 - 直通电缆连接 3 - 直通电缆连接 1 - 交叉电缆连接 3 - 交叉电缆7请参见图示。

IP 地址192.168.33.2 代表什么？主机的默认网关。

主机的IP 地址。

主机的首选域名服务器。

网站resolver1.mooki.local 的IP 地址。

主机的主页IP 地址。

8请参见图示。

对图示拓扑可以得出哪两项结论？（选择两项）存在一个广播域。

需要两个逻辑地址范围。

显示了三个广播域。

需要四个网络。

存在五个冲突域。

9哪些类型的介质不受EMI 和RFI 影响？（选择两项）10 Base-T10 Base-210 Base-5100 Base-FX100 Base TX1000 Base LX10请参见图示。

下列关于图中所示IP 配置的陈述，哪三项是正确的？（选择三项）分配给该计算机的地址代表私有地址。

该计算机无法在本地网络外通信。

此计算机的网络可支持126 台主机。

该计算机地址的前缀是/27。

分配给该计算机的IP 地址可在Internet 上路由。

分配给该计算机的IP 地址是广播地址。

11由于发生安全规规事件，必须更改路由器口令。

从以下配置项可获知什么信息？（选择两项。

）Router(config)#line vty 0 3Router(config-line)# password c13c0Router(config-line)#login这些配置项对远程访问指定了三条Telnet 线路。

这些配置项对远程访问指定了四条Telnet 线路。

这些配置项将控制台口令和Telnet 口令设置为"c13c0"。

因为Telnet 配置不完整，所以Telnet 访问将遭到拒绝。

允许使用"c13c0" 作为口令访问Telnet。

12作为网络管理员，假设IP 地址为172.30.0.0，能够支持510 台主机的子网掩码是什么？255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.12813哪种口令在创建时自动加密？vtyaux控制台电缆使能加密口令使能口令14第4 层报头包含帮助数据传输的哪一类信息？服务端口号主机逻辑地址设备物理地址虚拟连接标识符15请参见图示。

图中所示为客户端之间发送电子邮件的过程。

从下列选项中选择正确标识图中各编号阶段使用的组件或协议的列表。

1.MUA2.MDA3.MTA4.SMTP5.MTA6.POP7.MDA8.MUA1.MUA2.POP3.MDA4.SMTP5.MTA6.MDA7.SMTP8.MUA1.MUA2.POP3.SMTP4.MDA5.MTA6.SMTP7.POP8.MUA1.MDA2.SMTP3.MTA4.SMTP5.MTA6.MUA7.POP8.MDA1.MUA2.SMTP3.MTA4.SMTP5.MTA6.MDA7.POP8.MUA 16请参见图示。

哪种逻辑拓扑是对图示网络最准确的描述？星型环点对点多路访问网状17您所在的网际网络发生了路由问题。

要鉴别此错误，应该检查以下哪种类型的设备？接入点主机集线器路由器交换机18在Cisco IOS 设备中，启动配置文件存储于何处？闪存NVRAMRAMROM19请参见图示。

为了使此网络中的主机接入Internet，路由器RT_A 需要提供哪种功能？地址转换DHCP 服务ftpWeb 服务器20下列哪些有关网络层编址的陈述是正确的？（选择三项）使用平面结构防止广播分层唯一标识每台主机长48 位包括网络部分21请参见图示。

假设所有设备均使用默认配置。

支持显示的拓扑需要多少个子网？1345722请参见图示。

电缆 1 和电缆2 的两端分别按照特定的物理层要求接线。

表中按编号列出了每个网段以及网络技术人员在该网段不同网络组件之间已经安装的电缆。

根据给定的数据回答，哪些网段的电缆安装正确？（选择三项）网段 1网段 2网段 3网段 4网段 523请参见图示。

主机 A 尝试与主机 B 建立TCP/IP 会话。

尝试期间，捕获了源MAC 地址为0050.7320.D632 而目的MAC 地址为0030.8517.44C4 的帧。

捕获的帧中封装了源IP 地址为192.168.7.5 而目的IP 地址为192.168.219.24 的数据包。

此数据包是在网络中哪一点捕获的？离开主机 A离开ATL离开Dallas离开NYC24请参见图示。

下列哪两项陈述描述了报头中代表的信息？（选择两项）这是服务器响应。

使用的是UDP 协议。

目的端口表示Telnet 会话。

返回数据段将包含源端口23。

此会话的客户端发起的下一次会话将使用源端口号13358。

25下列哪种提示符代表适合copy running-config startup-config命令使用的模式？Switch-6J>Switch-6J#Switch-6J(config)#Switch-6J(config-if)#Switch-6J(config-line)#26请参见图示。

根据显示的IP 配置回答，主机 A 和主机 B 无法在本地网络外通信的原因是什么？对主机 A 分配了网络地址。

对主机 B 分配了组播地址。

主机 A 和主机 B 属于不同的网络。

对网关地址分配了广播地址。

27请参见图示。

下列哪组设备仅包含中间设备？A、B、D、GA、B、E、FC、D、G、IG、H、I、J28请参见图示。

主机 A 正在向主机 B 传输数据。

主机 A 将使用什么地址作为此通信中的目的IP 地址和目的MAC 地址？目的MAC：BBBB:BBBB:BBBB 目的IP：172.22.0.62目的MAC：DDDD:DDDD:DDDD 目的IP：172.22.0.75目的MAC：EEEE:EEEE:EEEE 目的IP：172.22.0.62目的MAC：BBBB:BBBB:BBBB 目的IP：172.22.0.75目的MAC：EEEE:EEEE:EEEE 目的IP：172.22.0.75目的MAC：DDDD:DDDD:DDDD 目的IP：172.22.0.9429下列哪三项陈述说明了传输层协议的特征？（选择三项）应用层协议使用TCP 端口号和UDP 端口号。

TCP 使用端口号提供可靠的IP 数据包传输。

UDP 使用窗口和确认获得可靠的数据传输。

TCP 使用窗口和定序提供可靠的数据传输。

TCP 是面向连接的协议。

UDP 是无连接协议。

30请参见图示。

当计算机 A 向计算机 D 发送帧时，哪些计算机会接收该帧？仅计算机 D仅计算机 A 和计算机 D仅计算机B、计算机 C 和计算机 D所有计算机31请参见图示。

包含路由器 B 的网络遇到问题。

助理网络工程师已确定此网络的问题出在路由器B。

执行什么操作可以纠正该网络问题？在接口FastEthernet 0/0 上发出ip address命令在接口FastEthernet 0/1 上发出no shutdown命令在接口Serial 0/0/0 上发出clock rate命令在接口Serial 0/0/1 上发出description命令32当OSI 模型下层执行无连接协议时，通常使用什么来确认数据接收并请求重传丢失的数据？无连接确认面向连接的上层协议网络层IP 协议传输层UDP 协议33请参见图示。

网络管理员从PC1 远程访问RouterB 的CLI。

下列有关用于建立此连接的应用层协议的陈述中，哪两项是正确的？（选择两项）数据经过加密。

该连接类型称为VTY 会话。

服务器进程在PC1 上运行。

GET 请求发送到RouterB。

服务、协议和客户端的应用名称相同。

34请参见图示。

对于从主机 A 向Web 服务器发出的网页请求，正确的目的套接字数字是什么？00-08-a3-b6-ce-46198.133.219.25:80C 172.18.0.0/24 is directly connected, FastEthernet0/035查看图示与当前配置。

秘书办公室的主机 A 由于故障被更换。

尽管更换的计算机可以成功ping 通127.0.0.1，但却无法访问公司网络。

问题的原因可能是什么？IP 地址输入有误网络电缆没有插好子网掩码输入有误网卡故障36IP 依靠OSI 哪一层的协议来确定数据包是否已丢失并请求重传？应用层表示层会话层传输层37一位技术人员必须通过要求提供口令来确保交换机特权执行模式的安全。

哪种类型的口令能满足此类登录的需要并可视为最安全的口令？控制台电缆使能使能加密口令VTY38请参见图示。

一台路由器（其路由表如图所示）收到发往192.168.1.4 的数据包。

路由器将如何处理该数据包？丢弃该数据包。

通过FastEthernet 0/0 转发该数据包。

将该数据包转发到目的主机。

将该数据包转发到下一跳地址192.168.1.3。

39下列哪三项是CSMA/CD 的特征？（选择三项）可以将设备配置为较高的传输优先级。

堵塞信号表示冲突已消除，介质不再占用。

设备侦听并等到介质未被占用后再传输。

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