思科认证：ccna真题(1)tcp--ip地址和协议
思科认证CCNA认证试题和答案中文版
思科认证CCNA认证试题和答案中文版思科认证CCNA认证试题和答案中文版想要获得思科认证，首先要参加由思科推荐并授权的培训中心(Cisco Training Partner，简称CTP)所开设的培训课程。
完成学业后再到由全球考试机构Sylvan Prometric授权的.考试中心参加由思科指定的科目的认证考试。
通过指定的系列科目考试后，学员就可以获得相应分支系列等级的资格认证。
下面是店铺为大家搜集的相关试题，供大家参考练习。
16、路由器A串口0配置如下interface serial0link-protocol pppppp pap local-user huawei password simple quidwayip address 2.2.2.1 255.0.0.0路由器B串口及全局配置如下local-user huawei service-type ppp password simple quidway!interface serial0link-protocol pppppp authentication-mode papip address 2.2.2.2 255.0.0.0当两台路由器串口0相连时，两台路由器是否可以连接到对端()(A) 能(B) 不能答案：A17、关于千兆以太网，以下说法正确的是( )(A) IEEE802.3ab定义了千兆以太网(B) 在同一冲突域中，千兆以太网不允许中继器的互连(C) IEEE802.3z专门定义了千兆以太网在双绞线上的传输标准(D) 千兆以太网支持网络速率的自适应，可以与快速以太网自动协商传输速率答案：AB参考知识点：华为3com认证教材第一册3-8页18、高层的协议将数据传递到网络层后，形成( )，而后传送到数据链路层(A) 数据帧(B) 信元(C) 数据包(D) 数据段答案：C参考知识点：华为3com认证教材第一册1-20页19、在路由器上配置帧中继静态map必须指定( )参数(A) 本地的DLCI(B) 对端的DLCI(C) 本地的协议地址(D) 对端的协议地址答案：AD20、路由器的主要性能指标不包括( )(A) 延迟(B) 流通量(C) 帧丢失率(D) 语音数据压缩比答案：D【思科认证CCNA认证试题和答案中文版】。
Cisco CCNA 认证考试最新真题
Cisco CCNA 认证考试最新真题体验1. The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?A.This command should be executed from the global configuration mode.B.The IP address 10.121.16.8 is the local router port used to forward data.C.102 is the remote DLCI that will receive the information.D.The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC2. While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist?A.the session layerB.the network layerC.the data link layerD.the access layer3. In order to allow the establishment of a Telnet session with a router, which set of commands must be configured?A.router(config)# line console 0router(config-line)# enable password ciscoB.router(config)# line console 0router(config-line)# enable secret ciscorouter(config-line)# loginC.router(config)# line console 0router(config-line)# password ciscorouter(config-line)# loginD.router(config)# line vty 0router(config-line)# password cisco router(config-line)# login4. On point-to-point networks, OSPF hello packets are addressed to which address?A.127.0.0.1B.192.168.0.5C.224.0.0.5D.254.255.255.2555. What should be part of a comprehensive network security plan?A.Allow users to develop their own approach to network security.B.Physically secure network equipment from potential access by unauthorized individualsC.Encourage users to use personal information in their passwords to minimize the likelihood of passwords being forgottenD.Delay deployment of software patches and updates until their effect on end-user equipment is well known and widely reported6. During startup, the router displays the following error message:boot: cannot open "flash:" What will the router do next?A.Because of damaged flash memory, the router will fail the POST.B.It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialogC.It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM.D.It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog7. At which OSI layer is a logical path created between two host systems?A.sessionB.transportworkD.physical8. A routing protocol is required that supports:1) routing update authentication2) an addressing scheme that conserves IP addresses3) multiple vendors4) a network with over 50 routersWhich routing protocol fulfills these requirements?A.RIPv1B.RIPv2C.EIGRPD.OSPF9. When a new trunk is configured on a 2950 switch, which VLANs by default are allowed over the trunk link?A.no VLANsB.all VLANsC.only VLANs 1 - 6D.only the VLANs that are specified when creating the trunk10. Which protocol provides a method of sharing VLAN configuration information between switches?A.VTPB.STPC.ISLD.802.1QDBDCB CCDBA博主的更多文章>>CCNA第一学期《Final Examination》2009-02-27 08:58:47 标签：CCNA[推送到技术圈]1请参见图示。
CCNA真题TCP-IP：地址和协议(1).doc
CCNA真题TCP/IP：地址和协议(1)1: Your junior network administrator wants to know what the default subnet mask is for a Class C IP address. What do you tell him?A. 255.0.0.0B. 255.255.0.0C. 255.245.255.0D. 255.255.255.0E. 255.255.255.2552: An application needs to have reliable, end-to-end connect-ivity. Which of the following protocols will give you reliable connectivity?A. TCPB. UDPC. IPD. ICMP3: You are designing a network, which needs to support 55 users. You don't plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs?A. 255.255.0.0B. 255.255.255.0C. 255.255.255.192D. 255.255.255.1604: You have added a new switch to your network. You want to manage it remotely, so you need to assign it an IP address. Your router that connects to the switch has an IP address of 172.16.12.33/27. Which of the following addresses can you assign to this switch?A. 172.16.12.33/28B. 172.16.12.32/27C. 172.16.12.33/27D. 172.16.12.34/27E. 172.16.12.35/28F. 172.16.12.38/28G. 172.16.12.63/275: The address 172.16.208.16/20 is a host address in which of the following subnets?A. 172.16.176.0–255.255.240.0B. 172.16.192.0–255.255.240.0C. 172.16.208.0–255.255.240.0D. 172.16.224.0–255.255.240.06: You are designing an IP address scheme for your brand new remote office. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. This supplies you with a single subnetwork with 62 hosts. You need to have at least two subnets with 14 hosts in each subnet. What custom subnet mask should you use?A. 255.255.255.128B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.2487: You have subnetted the 210.106.14.0 network with a /24 mask. Your boss at Acme, Inc. wants to know how many usable subnetworks and usable host addresses per subnet this would provide. What should you tell her?A. One network with 254 hostsB. Two networks with 128 hostsC. Four networks with 64 hostsD. Six networks with 30 hosts8: Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (Choose three.)A. 201.168.27.33B. 201.168.27.112C. 201.168.27.119D. 201.168.27.126E. 201.168.27.175F. 201.168.27.2089: What is the subnetwork address for a host with the IP address 201.100.5.68/28?A. 201.100.5.0B. 201.100.5.32C. 201.100.5.64D. 201.100.5.65E. 201.100.5.31F. 201.100.5.110: Which of the following protocols uses a three-way handshake mechanism to establish sessions?A. TCPB. IPC. UDPD. IPXE. Frame relay11: Which of the following protocols is connection-oriented?A. TCPB. IPC. IPXD. Frame relay12: You are using an application on your Windows 2000 client machines that provides error correction. You need a protocol to provide fast transport. Which protocol should your application use?A. TCPB. IPC. UDPD. SPXE. AppleTalk13: When using TCP, after a session is open, the applications can adjust the number of segments they receive before sending an acknowledgment. This behavior is known as ______________.A. MTU adjustmentB. WindowingC. Flexible Send PathD. FCS14: If the destination did not receive a segment, how will the TCP host know to resend the information?A. The ACK received will not include the segment number that was not received.B. The ACK received will include the segment number that was not received.C. The sending host will send a PACK to verify segment receipt.D. The destination host will send a YACK message back to the sending host.15: You are planning on using a single network that supports 208 users. Which IP address class would you choose to be the most efficient?A. Class AB. Class BC. Class CD. Class DE. Class E16: RFC 1918 defines the private IP address ranges. Which of the following IP addresses are considered part of these ranges? (Choose three.)A. 10.23.45.67B. 126.21.34.56C. 172.16.32.1D. 172.31.234.55E. 192.169.4.517: A new network is being designed for your company, Acme, Inc. If you use a Class C IP network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?DepartmentA. 255.255.255.0B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.24818: Which of these protocols provides data transport, relying on the error correction capabilities of the application itself?A. UDPB. TCPC. SNMPD. ICMP19: Which of the following are used by TCP to ensure reliable delivery of data? (Choose two.)A. MAC address resolutionB. Sequence numbersC. AcknowledgmentsD. PingE. Routing updates20: You discover that you are able to adjust the window size of the TCP segment. You increase the window size to test the results. What will you observe happening on your network?A. Increased throughputB. Decreased throughputC. Increased latencyD. Decreased reliability21: Your organization is using the 192.168.1.0/24 address space. You need 28 subnets. What subnet mask would you use to create these subnets?A. 255.255.255.0B. 255.255.255.128C. 255.255.255.192D. 255.255.255.224E. 255.255.255.240F. 255.255.255.24822: Which of the following protocols maps IP addresses to MAC addresses for connectivity to occur between two hosts?A. ARPB. RARPC. SLARPD. DHCP23: Your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. Which of the following is not an answer that you would give him?A. The host's default gateway is down.B. The destination host is not powered on.C. The IP address of the router interface is incorrect.D. The IP address of the switch to which the destination host connects is incorrect.E. The host is in a different subnet.24: Which of the following classes of IP addresses is utilized for multicasting?A. Class AB. Class BC. Class CD. Class D25: You give your IT department a spreadsheet of IP addresses and their subnets. You receive a call from one of the junior techs asking what the /26 means next to the IP addresses. You tell her:A. It represents the number of hosts possible on that subnetwork.B. It represents the number of subnetworks that are being used.C. It represents the class of IP address being used.D. It represents the number of bits in the subnet mask that are 1.26: You are given an IP network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. This will help alleviate congestion on the network. What subnet mask can you use to create the subnets necessary to meet the given criteria?A. 255.0.0.0B. 255.255.0.0C. 255.255.255.0D. 255.255.255.224E. 255.255.255.24027: Which of the following would a Class A network be assigned to?A. Government agencyB. Small-to-medium sized corporationC. SOHOD. An individual28: A client has the IP address 192.168.5.98/27. Which of the following addresses are on the same subnet as this host? (Choose two.)A. 192.168.5.95B. 192.168.5.100C. 192.168.5.128D. 192.168.5.11029: Which of the following IP addresses is not a public IP address that can be routed over the Internet?A. 2.3.4.5B. 11.12.13.14C. 165.23.224.2D. 172.31.45.34E. 203.33.45.2230: You are given a Class B network. What is the default subnet mask assigned to the Class B network?A. 255.255.255.255B. 255.255.0.0C. 255.224.0.0D. 0.0.0.031: You are troubleshooting your router's interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. Which of the following explains the router's refusal to take the IP address?A. Class C addresses cannot be assigned to Ethernet interfaces.B. The /27 is an invalid mask.C. It is a broadcast address.D. It is a public IP address.E. It is a private IP address.32: You are a network technician at Acme, Inc. You are required to divide the 172.12.0.0 network into subnets. Each subnet must have the capacity of 458 IP addresses. Also, according to the requirements, you must provide the maximum number of subnets. Which subnet mask should you use?A. 255.255.255.254B. 255.255.254.0C. 255.255.240.254D. 255.255.0.033: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of 255.255.255.248?A. 192.168.2.24/192.168.2.31B. 192.168.2.32/192.168.2.39C. 192.168.2.40/192.168.2.47D. 192.168.2.48/192.168.2.55E. 192.168.2.56/192.168.2.6334: One of your co-workers at Acme, Inc., needs to convert the binary number 11011010 into a decimal. What is the decimal equivalent?A. 218B. 219C. 220D. 22135: One of your co-workers at Acme, Inc., needs to convert the binary number 01011010 into a decimal. What is the decimal equivalent?A. 75B. 83C. 90D. 9736: One of your co-workers at Acme, Inc., needs to convert the binary number 11010110 into a decimal. What is the decimal equivalent?A. 198B. 214C. 252D. 25537: One of your co-workers at Acme, Inc., needs to convert the binary number 10110110 into a decimal. What is the decimal equivalent?A. 182C. 202D. 21238: You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.19239: You are a network technician at Acme, Inc. You have subnetted the 208.98.112.0 network with a /28 mask. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router is using ip subnet-zero?A. 62 networks and 2 hostsB. 6 networks and 30 hostsD. 16 networks and 16 hostsE. 16 networks and 14 hosts40: What is a disadvantage of using a connection-oriented protocol such as TCP?A. Packet acknowledgment might add overhead.B. Packets are not tagged with sequence numbers.C. Loss or duplication of data packets is more likely to occur.D. The application layer must assume responsibility for the correct sequencing of the data packets.41: You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router cannot use ip subnet-zero?A. 62 networks and 2 hostsB. 6 networks and 30 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hosts42: Which of the following IP addresses are considered "network" addresses with a /26 prefix? (Choose two.)A. 165.203.2.0B. 165.203.5.192C. 165.203.6.63D. 165.203.6.191E. 165.203.8.25543: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)A. 192.168.32.33B. 192.168.32.112C. 192.168.32.119D. 192.168.32.126E. 192.168.32.175F. 192.168.32.20844: A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?A. 198.57.78.33B. 198.57.78.64C. 198.57.78.97D. 198.57.78.97E. 198.57.78.159F. 198.57.78.25445: What is the subnetwork address for a host with IP address 165.100.5.68/28?A. 165.100.5.0B. 165.100.5.32C. 165.100.5.64D. 165.100.5.65E. 165.100.5.31F. 165.100.5.146: Your boss wants to know what TCP stands for. What do you tell him?A. Transmission Check ProtocolB. Transport Check ProtocolC. Transmission Control ProtocolD. Transport Control Protocol47: Your boss wants to know what UDP stands for. What do you tell him?A. Unreliable Data ProtocolB. Unreliable Data ProgramC. User-Defined ProtocolD. User Datagram Protocol48: Which of the following statements accurately describes UDP?A. UDP copies files between a computer and a system running rshd, the remote shell service (daemon).B. UDP is a member of the TCP/IP suite of protocols that governs the exchange of electronic mail between message transfer agents.C. UDP is a member of the TCP/IP suite of protocols and is used to copy files between two computers on the Internet. Both computers must support their respective roles: one must be a client, and the other a server.D. UDP is a TCP complement that offers a connectionlessdatagram service guaranteeing neither delivery nor correct sequencing of delivered packets (much like IP).49: Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.)A. 10.20.12.64B. 172.16.32.129C. 172.64.32.34D. 192.168.23.252E. 196.104.12.95F. 214.192.48.25450: You are connecting your Serial 0/1 interface to the Internet. Which of the following need to be done for the connection to work? (Choose two.)A. Assign a public IP address.B. Use the shutdown command.C. Use the no shutdown command.D. Make sure the interface is running in full-duplex.。
ccna面试题目
ccna面试题目在准备CCNA（Cisco Certified Network Associate）面试时，需要掌握并准确回答相关的面试题目。
本文将就一些常见的CCNA面试题目进行讨论，以帮助读者更好地应对这些挑战。
以下是一些常见的CCNA面试题目及其详细解答。
题目一：什么是OSI模型？它由哪些层组成？答：OSI模型是开放式系统互连参考模型（Open Systems Interconnection Reference Model）的简称，它是国际标准化组织（ISO）制定的一个用于计算机网络互连的概念模型。
OSI模型共由七个层组成，分别是物理层、数据链路层、网络层、传输层、会话层、表示层和应用层。
每一层都有其特定的功能和协议。
题目二：请解释一下TCP/IP协议族。
答：TCP/IP协议族是一系列协议的集合，用于在因特网上进行通信。
它由包括互联网协议（IP）、传输控制协议（TCP）、用户数据报协议（UDP）等在内的多个协议组成。
其中，IP协议负责将数据包从源地址传输到目的地址，TCP协议提供可靠的连接和数据传输服务，UDP协议则提供不可靠但效率较高的数据传输服务。
题目三：请描述一下子网掩码的作用。
答：子网掩码用于将IP地址分为网络地址和主机地址两部分，确定子网中主机的数量和网络范围。
通过与IP地址进行逻辑与运算，子网掩码能够识别网络地址和主机地址。
网络中的路由器使用子网掩码来确定数据包的传输路径，以便正确地将数据包发送到目标主机。
题目四：请解释一下DNS的作用。
答：DNS（Domain Name System）是用于将域名解析为IP地址的分布式命名系统。
当我们在浏览器输入一个域名时，DNS会将该域名翻译为相应的IP地址，以便能够正确地连接到目标服务器。
DNS的作用是提供可读性强的域名，方便用户访问互联网，同时减轻记忆IP地址的负担。
题目五：请解释一下路由器和交换机的区别。
答：路由器和交换机是网络中两种不同的设备。
20XX思科CCNA真题：TCP-IP地址和协议.doc
2015思科CCNA真题：TCP/IP地址和协议1: your junior network administrator wants to know what the default subnet mask is for a class c ip address. what do you tell him?Truea. 255.0.0.0Trueb. 255.255.0.0Truec. 255.245.255.0Trued. 255.255.255.0Truee. 255.255.255.255True2: an application needs to have reliable, end-to-end connect-ivity. which of the following protocols will give you reliable connectivity?Truea. tcpTrueb. udpTruec. ipTrued. icmpTrue3: you are designing a network, which needs to support 55 users. you don't plan to extend the segment beyond the current number of users. which subnet mask would best meet your needs?Truea. 255.255.0.0Trueb. 255.255.255.0Truec. 255.255.255.192Trued. 255.255.255.160True4: you have added a new switch to your network. you want to manage it remotely, so you need to assign it an ip address. your router that connects to the switch has an ip address of 172.16.12.33/27. which of the following addresses can you assign to this switch?Truea. 172.16.12.33/28Trueb. 172.16.12.32/27Truec. 172.16.12.33/27Trued. 172.16.12.34/27Truee. 172.16.12.35/28Truef. 172.16.12.38/28Trueg. 172.16.12.63/27True5: the address 172.16.208.16/20 is a host address in which of the following subnets?Truea. 172.16.176.0–255.255.240.0Trueb. 172.16.192.0–255.255.240.0Truec. 172.16.208.0–255.255.240.0Trued. 172.16.224.0–255.255.240.0True6: you are designing an ip address scheme for your brand new remote office. the vice president of it calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. this supplies you with a single subnetwork with 62 hosts. you need to have at least two subnets with 14 hosts in each subnet. what custom subnet mask should you use?Truea. 255.255.255.128Trueb. 255.255.255.192Truec. 255.255.255.224Trued. 255.255.255.240Truee. 255.255.255.248True7: you have subnetted the 210.106.14.0 network with a /24 mask. your boss at acme, inc. wants to know how many usable subnetworks and usable host addresses per subnet this would provide. what should you tell her?Truea. one network with 254 hostsTrueb. two networks with 128 hostsTruec. four networks with 64 hostsTrued. six networks with 30 hostsTrue8: identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (choose three.)Truea. 201.168.27.33Trueb. 201.168.27.112Truec. 201.168.27.119Trued. 201.168.27.126Truee. 201.168.27.175Truef. 201.168.27.208True9: what is the subnetwork address for a host with the ip address 201.100.5.68/28?Truea. 201.100.5.0Trueb. 201.100.5.32Truec. 201.100.5.64Trued. 201.100.5.65Truee. 201.100.5.31Truef. 201.100.5.1True10: which of the following protocols uses a three-way handshake mechanism to establish sessions?a. tcpTrueb. ipTruec. udpTrued. ipxTruee. frame relayTrue11: which of the following protocols is connection-oriented?Truea. tcpTrueb. ipTruec. ipxTrued. frame relayTrue12: you are using an application on your windows 2000 client machines that provides error correction. you need a protocol to provide fast transport. which protocol should your application use?Truea. tcpTrueb. ipTruec. udpTrued. spxTruee. appletalkTrue13: when using tcp, after a session is open, the applications canadjust the number of segments they receive before sending an acknowledgment. this behavior is known as ______________.Truea. mtu adjustmentTrueb. windowingTruec. flexible send pathTrued. fcsTrue14: if the destination did not receive a segment, how will the tcp host know to resend the information?Truea. the ack received will not include the segment number that was not received.Trueb. the ack received will include the segment number that was not received.Truec. the sending host will send a pack to verify segment receipt.Trued. the destination host will send a yack message back to the sending host.True15: you are planning on using a single network that supports 208 users. which ip address class would you choose to be the mostefficient?Truea. class aTrueb. class bTruec. class cTrued. class dTruee. class eTrue16: rfc 1918 defines the private ip address ranges. which of the following ip addresses are considered part of these ranges? (choose three.)Truea. 10.23.45.67Trueb. 126.21.34.56Truec. 172.16.32.1Trued. 172.31.234.55Truee. 192.169.4.5True17: a new network is being designed for your company, acme, inc. if you use a class c ip network, which subnet mask will provide one usable subnet per department while allowing enough usable hostaddresses for each department specified in the table?True departmentTruenumber of usersTruecorporateTrue7Truecustomer supportTrue15TruefinancialTrue13TruehrTrue7TrueengineeringTrue16TrueTruea. 255.255.255.0Trueb. 255.255.255.192Truec. 255.255.255.224Trued. 255.255.255.240Truee. 255.255.255.248True18: which of these protocols provides data transport, relying on the error correction capabilities of the application itself?Truea. udpTrueb. tcpTruec. snmpTrued. icmpTrue19: which of the following are used by tcp to ensure reliable delivery of data? (choose two.)Truea. mac address resolutionTrueb. sequence numbersTruec. acknowledgmentsTrued. pingTruee. routing updatesTrue20: you discover that you are able to adjust the window size of the tcp segment. you increase the window size to test the results. what will you observe happening on your network?Truea. increased throughputTrueb. decreased throughputTruec. increased latencyTrued. decreased reliability21: your organization is using the 192.168.1.0/24 address space. you need 28 subnets. what subnet mask would you use to create these subnets?Truea. 255.255.255.0Trueb. 255.255.255.128Truec. 255.255.255.192Trued. 255.255.255.224Truee. 255.255.255.240Truef. 255.255.255.248True22: which of the following protocols maps ip addresses to mac addresses for connectivity to occur between two hosts?Truea. arpTrueb. rarpTruec. slarpTrued. dhcpTrue23: your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. which of the following is not an answer that you would give him?Truea. the host's default gateway is down.Trueb. the destination host is not powered on.Truec. the ip address of the router interface is incorrect.Trued. the ip address of the switch to which the destination host connects is incorrect.Truee. the host is in a different subnet.True24: which of the following classes of ip addresses is utilized for multicasting?Truea. class aTrueb. class bTruec. class cTrued. class dTrue25: you give your it department a spreadsheet of ip addresses and their subnets. you receive a call from one of the junior techs asking what the /26 means next to the ip addresses. you tell her:Truea. it represents the number of hosts possible on that subnetwork.Trueb. it represents the number of subnetworks that are being used.Truec. it represents the class of ip address being used.Trued. it represents the number of bits in the subnet mask that are1.True26: you are given an ip network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. this will help alleviate congestion on the network. what subnet mask can you use to create the subnets necessary to meet the given criteria?Truea. 255.0.0.0Trueb. 255.255.0.0Truec. 255.255.255.0Trued. 255.255.255.224Truee. 255.255.255.240True27: which of the following would a class a network be assigned to?Truea. government agencyTrueb. small-to-medium sized corporationTruec. sohoTrued. an individualTrue28: a client has the ip address 192.168.5.98/27. which of thefollowing addresses are on the same subnet as this host? (choose two.)Truea. 192.168.5.95Trueb. 192.168.5.100Truec. 192.168.5.128Trued. 192.168.5.110True29: which of the following ip addresses is not a public ip address that can be routed over the internet?Truea. 2.3.4.5Trueb. 11.12.13.14Truec. 165.23.224.2Trued. 172.31.45.34Truee. 203.33.45.22True30: you are given a class b network. what is the default subnet mask assigned to the class b network?Truea. 255.255.255.255Trueb. 255.255.0.0Truec. 255.224.0.0Trued. 0.0.0.0True31: you are troubleshooting your router's interfaces. for some reason, the ethernet interface will not accept the ip address of 192.168.5.95/27 that you've assigned. which of the following explains the router's refusal to take the ip address?Truea. class c addresses cannot be assigned to ethernet interfaces.Trueb. the /27 is an invalid mask.Truec. it is a broadcast address.Trued. it is a public ip address.Truee. it is a private ip address.True32: you are a network technician at acme, inc. you are required to divide the 172.12.0.0 network into subnets. each subnet must have the capacity of 458 ip addresses. also, according to the requirements, you must provide the maximum number of subnets. which subnet mask should you use?Truea. 255.255.255.254Trueb. 255.255.254.0Truec. 255.255.240.254Trued. 255.255.0.0True33: what is the subnetwork and broadcast ip address of 192.168.2.37 with the subnet mask of 255.255.255.248?Truea. 192.168.2.24/192.168.2.31Trueb. 192.168.2.32/192.168.2.39Truec. 192.168.2.40/192.168.2.47Trued. 192.168.2.48/192.168.2.55Truee. 192.168.2.56/192.168.2.63True34: one of your co-workers at acme, inc., needs to convert the binary number 11011010 into a decimal. what is the decimal equivalent?Truea. 218Trueb. 219Truec. 220Trued. 221Truee. 222True35: one of your co-workers at acme, inc., needs to convert the binary number 01011010 into a decimal. what is the decimal equivalent?Truea. 75Trueb. 83Truec. 90Trued. 97True36: one of your co-workers at acme, inc., needs to convert the binary number 11010110 into a decimal. what is the decimal equivalent?Truea. 198Trueb. 214Truec. 252Trued. 255True37: one of your co-workers at acme, inc., needs to convert the binary number 10110110 into a decimal. what is the decimal equivalent?Truea. 182Trueb. 192Truec. 202Trued. 212True38: you are configuring a subnet for the acme, inc., branch office in beijing. you need to assign ip addresses to hosts in this subnet. you have been given the subnet mask of 255.255.255.224. which of these ip addresses would be valid? (choose three.)Truea. 15.234.118.63Trueb. 92.11.178.93Truec. 134.178.18.56Trued. 192.168.16.87Truee. 201.45.116.159Truef. 217.63.12.19239: you are a network technician at acme, inc. you have subnetted the 208.98.112.0 network with a /28 mask. your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. what should you tell her, assuming your router is using ip subnet-zero?Truea. 62 networks and 2 hostsTrueb. 6 networks and 30 hostsTruec. 8 networks and 32 hostsTrued. 16 networks and 16 hostsTruee. 16 networks and 14 hostsTrue40: what is a disadvantage of using a connection-oriented protocol such as tcp?Truea. packet acknowledgment might add overhead.Trueb. packets are not tagged with sequence numbers.Truec. loss or duplication of data packets is more likely to occur.Trued. the application layer must assume responsibility for the correct sequencing of the data packets.41: you are a network technician at acme, inc. you havesubnetted the 192.168.72.0 network with a /30 mask for connections between your routers. your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. what should you tell her, assuming your router cannot use ip subnet-zero?Truea. 62 networks and 2 hostsTrueb. 6 networks and 30 hostsTruec. 8 networks and 32 hostsTrued. 16 networks and 16 hostsTruee. 14 networks and 14 hostsTrue42: which of the following ip addresses are considered "network" addresses with a /26 prefix? (choose two.)Truea. 165.203.2.0Trueb. 165.203.5.192Truec. 165.203.6.63Trued. 165.203.6.191Truee. 165.203.8.255True43: identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (choose three.)Truea. 192.168.32.33Trueb. 192.168.32.112Truec. 192.168.32.119Trued. 192.168.32.126Truee. 192.168.32.175Truef. 192.168.32.208True44: a class c network address has been subnetted with a /27 mask. which of the following addresses is a broadcast address for one of the resulting subnets?Truea. 198.57.78.33Trueb. 198.57.78.64Truec. 198.57.78.97Trued. 198.57.78.97Truee. 198.57.78.159Truef. 198.57.78.254True45: what is the subnetwork address for a host with ip address 165.100.5.68/28?Truea. 165.100.5.0Trueb. 165.100.5.32Truec. 165.100.5.64Trued. 165.100.5.65Truee. 165.100.5.31Truef. 165.100.5.1True46: your boss wants to know what tcp stands for. what do you tell him?Truea. transmission check protocolTrueb. transport check protocolTruec. transmission control protocolTrued. transport control protocolTrue47: your boss wants to know what udp stands for. what do youtell him?Truea. unreliable data protocolTrueb. unreliable data programTruec. user-defined protocolTrued. user datagram protocolTrue48: which of the following statements accurately describes udp?Truea. udp copies files between a computer and a system running rshd, the remote shell service (daemon).Trueb. udp is a member of the tcp/ip suite of protocols that governs the exchange of electronic mail between message transfer agents.Truec. udp is a member of the tcp/ip suite of protocols and is used to copy files between two computers on the internet. both computers must support their respective roles: one must be a client, and the other a server.Trued. udp is a tcp complement that offers a connectionless datagram service guaranteeing neither delivery nor correct sequencing of delivered packets (much like ip).True49: which of the following host addresses are members of networks that can be routed across the public internet? (choose three.)Truea. 10.20.12.64Trueb. 172.16.32.129Truec. 172.64.32.34Trued. 192.168.23.252Truee. 196.104.12.95Truef. 214.192.48.254True50: you are connecting your serial 0/1 interface to the internet. which of the following need to be done for the connection to work? (choose two.)Truea. assign a public ip address.Trueb. use the shutdown command.Truec. use the no shutdown command.Trued. make sure the interface is running in full-duplex.。
网络工程师CCNA证书考试题库
网络工程师CCNA证书考试题库网络工程师是当今社会上一种备受青睐的职业，具备CCNA证书是成为一名合格网络工程师的基本要求之一。
CCNA（Cisco Certified Network Associate）是思科公司提供的一种权威的网络证书，考试内容涵盖了网络基础知识、路由器和交换机配置、网络安全等方面的内容。
下面将为大家整理一份网络工程师CCNA证书考试题库，供大家参考和复习。
一、网络基础知识1. OSI参考模型中，哪一层负责确定数据如何在网络中传输？A. 应用层B. 传输层C. 网络层D. 数据链路层2. IP地址的子网掩码用来做什么？A. 区分网络地址和主机地址B. 确定网络的物理拓扑C. 控制网络访问权限D. 提高网络安全性3. TCP协议是一种什么类型的协议？A. 面向连接型B. 面向无连接型C. 面向消息型D. 面向数据流型4. 下面哪种传输介质是最适合用于在大楼内部连接不同楼层的网络设备？A. 双绞线B. 同轴电缆C. 光纤D. 无线电波二、路由器和交换机配置1. 在路由器上配置静态路由需要设置哪些参数？A. 出接口B. 下一跳地址C. 网关地址D. 子网掩码2. 交换机的VLAN技术主要用来实现什么功能？A. 提高网络传输速度B. 划分不同的广播域C. 增加网络安全性D. 实现无线网络连接3. 在路由器上配置NAT技术的目的是什么？A. 增加网络带宽B. 实现内网主机与外网通信C. 提高网络可靠性D. 实现跨平台数据传输4. 交换机端口默认是属于哪个VLAN？A. VLAN1B. VLAN10C. VLAN100D. VLAN1000三、网络安全1. 以下哪种加密算法用于保护传输过程中的数据机密性？A. DESB. MD5C. RSAD. SHA2. 防火墙的作用是什么？A. 限制网络带宽的使用B. 监控网络流量C. 阻止非法入侵D. 加快网络数据传输速度3. 在网络安全方面，ACL（访问控制列表）主要用来控制什么？A. 网络拓扑B. 主机访问权限C. 广播域D. 数据传输速度4. DDos攻击是指什么？A. 拒绝服务攻击B. 数据泄露攻击C. 蠕虫攻击D. 恶意代码攻击通过以上网络工程师CCNA证书考试题库的复习，相信大家可以更加全面地了解CCNA考试的内容要求，提升自己的备考水平。
ccna考试题库最新版
ccna考试题库最新版CCNA（Cisco Certified Network Associate）认证是全球范围内最受欢迎的网络工程师认证之一，具备CCNA认证可以证明一个人在建立、规划、运行、安装和配置中等规模的局域网和广域网方面的专业知识。
为了帮助广大考生顺利通过CCNA考试，不断更新的CCNA考试题库至关重要。
以下是最新版本的CCNA考试题库，希望对考生们有所帮助。
第一部分：网络基础知识1. 什么是OSI七层模型？简要介绍每一层的功能。
2. TCP和UDP之间有哪些区别？请分别举例说明。
3. 什么是IP地址？IP地址的类型有哪些？请列举并简要介绍各自的特点。
4. 什么是子网掩码？为什么在网络中使用子网掩码？5. 简述常见的网络设备有哪些，以及各自的功能与作用。
第二部分：路由和交换技术1. 路由器和交换机之间有何区别？请进行比较并指出各自的优势和劣势。
2. 什么是VLAN？VLAN的作用及在网络中的应用场景是什么？3. OSPF和EIGRP是两种常见的路由协议，请比较它们的特点并举例说明。
4. 请解释静态路由和动态路由的概念以及在网络中的应用。
5. 交换机在网络中扮演什么角色？交换机的MAC地址表是如何工作的？第三部分：网络安全和管理1. 网络安全的重要性是什么？请列举几种常见的网络安全威胁并介绍应对策略。
2. 什么是ACL（访问控制列表）？ACL的作用是什么？请给出一个ACL的配置示例。
3. VPN是什么？VPN的工作原理及在企业网络中的应用。
4. SNMP是网络管理中常用的协议，它的作用是什么？请解释SNMP中的几个重要概念。
5. 如何保护无线网络的安全？请列举几种方法。
第四部分：WAN技术1. 什么是WAN？WAN的主要特点是什么？2. PPP协议和HDLC协议分别是什么？请比较它们的异同。
3. 什么是Frame Relay？Frame Relay的工作原理及在WAN中的应用。
4. 请解释T1和E1的概念，以及它们在传输速率和应用方面的差异。
思科ccna复习题
思科ccna复习题思科CCNA复习题是许多IT从业者在准备网络认证考试时面临的重要挑战。
CCNA（Cisco Certified Network Associate）认证是全球范围内最受认可的网络认证之一，它涵盖了网络基础知识、路由和交换技术、网络安全、无线网络等方面的内容。
在复习CCNA考试的过程中，掌握并解答复习题是一种非常有效的学习方法。
本文将介绍一些常见的CCNA复习题，并给出相应的解答和解析。
一、网络基础知识1. 什么是IP地址？IP地址有几种类型？答：IP地址是用于标识网络上设备（如计算机、路由器等）的一串数字。
IP地址分为IPv4和IPv6两种类型。
IPv4使用32位二进制数表示，通常以四个十进制数表示，每个数的取值范围是0-255。
IPv6使用128位二进制数表示，通常以八组四位十六进制数表示。
2. 什么是子网掩码？如何计算子网掩码？答：子网掩码是用于划分IP地址的网络部分和主机部分的一串二进制数。
计算子网掩码的方法是将IP地址中网络部分的位全部设置为1，主机部分的位全部设置为0。
例如，对于IP地址192.168.0.1，如果要将前24位作为网络部分，剩余8位作为主机部分，那么子网掩码为255.255.255.0。
二、路由和交换技术1. 什么是路由器？它的作用是什么？答：路由器是一种网络设备，用于在不同的网络之间传输数据包。
它通过查找路由表，将数据包从源地址传输到目标地址。
路由器的作用是实现不同网络之间的互联和数据转发。
2. 什么是交换机？与路由器有何区别？答：交换机是一种网络设备，用于在局域网内传输数据包。
它通过学习MAC地址，将数据包从源地址传输到目标地址。
交换机与路由器的区别在于作用范围不同，交换机只能在局域网内传输数据，而路由器可以在不同网络之间传输数据。
三、网络安全1. 什么是防火墙？它的作用是什么？答：防火墙是一种网络安全设备，用于监控和控制网络数据流。
它通过过滤、检测和阻止不安全的网络流量，保护网络免受未经授权的访问、攻击和数据泄露。
2023年CCNA考试真题
2023年CCNA考试真题2023年CCNA考试正式开考啦！本次考试涉及网络技术的基础知识，将对考生的技术水平进行全面考察。
下面是本次考试的真题，希望能够帮助考生更好地复习。
【第一部分：选择题】（共10题，每题2分，共计20分）1. OSI模型中，位于网络层的协议是：A. TCPB. IPC. HTTPD. UDP2. 下面哪个命令可以查看路由表信息：A. pingB. tracertC. ipconfigD. route print3. 在IP地址192.168.0.1/24中，/24表示什么意思：A. 子网掩码B. 路由器IP地址C. 网络IDD. 主机ID4. 下面哪个协议可以实现主机与交换机之间的通信：A. BGPB. ARPC. MPLSD. SNMP5. 下面哪个命令可以查看IP地址的连通性：A. telnetB. netstatC. pingD. tracert6. VLAN是指：A. 虚拟本地区域网络B. 可视化局域网C. 个人局域网D. 无线局域网7. 下面哪个设备可以实现不同局域网之间的互联：A. 集线器B. 路由器C. 交换机D. 网桥8. 下面哪个协议负责在网络中寻找设备的物理地址：A. ARPB. ICMPC. OSPFD. BGP9. 下面哪个命令可以查看交换机的端口信息：A. show ip interface briefB. show mac-address-tableC. show running-configD. show version10. 下面哪个协议可以实现安全的远程登录：A. FTPB. HTTPC. SSHD. Telnet【第二部分：填空题】（共5题，每题4分，共计20分）1. 在OSI模型中，位于物理层的设备是_________。
2. 在TCP/IP协议族中，位于传输层的协议是_________。
3. IP地址由_________位二进制数组成。
2023年CCNA考试真题答案分析
2023年CCNA考试真题答案分析作为全球性的IT认证考试之一，CCNA（Cisco Certified Network Associate）考试一直以来都备受关注。
2023年CCNA考试的真题是许多考生关注的焦点。
下面将对2023年CCNA考试的真题答案进行分析，旨在帮助考生更好地了解考试的内容和要求。
一、第一题：在OSPF协议中，下面哪个区域是Stub区域？答案：区域0（Area 0）分析：OSPF（Open Shortest Path First）是一种广泛使用的内部网关协议（IGP）。
在OSPF中，区域被用于划分网络，Stub区域是指一个没有外部路由进入的区域。
在OSPF中，区域0通常被称为Backbone区域，是所有其他区域的集线器。
因此，区域0是Stub区域。
二、第二题：在TCP/IP协议栈中，下面哪个协议负责将IP地址转换为MAC地址？答案：ARP（Address Resolution Protocol）分析：ARP是一种用于将IP地址转换为MAC地址的协议，它工作在TCP/IP协议栈的网络层和数据链路层之间。
当一个主机需要发送数据包到目标主机时，它首先会查询ARP缓存表，如果找不到目标主机的MAC地址，则会发送ARP请求广播，请求目标主机回应其MAC地址。
三、第三题：在VLAN中，下面哪个协议用于实现不同VLAN之间的通信？答案：路由协议或三层交换机分析：VLAN（Virtual Local Area Network）是一种实现逻辑隔离的技术，可以将物理上的网络划分为多个逻辑上的网络。
不同VLAN之间的通信需要通过路由器或三层交换机来实现。
路由器可以实现不同VLAN之间的互联，而三层交换机具备路由功能，可以在交换机内部实现不同VLAN之间的通信。
四、第四题：以下哪种网络攻击会使用大量的伪造的IP数据包来淹没目标网络？答案：DDoS（Distributed Denial of Service）分析：DDoS是一种分布式拒绝服务攻击，攻击者会利用多个主机发送大量的伪造IP数据包到目标网络，造成网络堵塞、服务不可用等问题。
ccna复习题
ccna复习题CCNA复习题随着信息技术的快速发展，网络技术的重要性也越来越凸显。
作为网络技术领域的基础认证之一，CCNA（Cisco Certified Network Associate）考试是许多IT从业者迈向网络工程师职业道路的必经之路。
为了帮助考生更好地备战CCNA考试，本文将介绍一些常见的CCNA复习题，并探讨一些相关的知识点。
1. OSI参考模型是什么？它包含哪些层次？答：OSI参考模型是一种网络通信协议的抽象模型，用于指导网络通信的设计和实现。
它包含以下七个层次：物理层、数据链路层、网络层、传输层、会话层、表示层和应用层。
2. TCP/IP协议族是由哪些协议组成的？答：TCP/IP协议族是由多个协议组成的，其中一些重要的协议包括：IP （Internet Protocol）、TCP（Transmission Control Protocol）、UDP（User Datagram Protocol）、FTP（File Transfer Protocol）、HTTP（Hypertext Transfer Protocol）等。
3. 什么是子网掩码？它的作用是什么？答：子网掩码是一种用于划分IP地址的工具，用于确定网络号和主机号的边界。
它的作用是将IP地址划分为网络地址和主机地址两部分，以便于进行网络通信和管理。
4. 请解释什么是IP地址和MAC地址？答：IP地址是用于在网络上唯一标识主机的一串数字，它由32位二进制数组成，通常以点分十进制表示。
MAC地址是网卡的物理地址，由48位二进制数组成，通常以冒号分隔的十六进制表示。
5. 什么是路由器？它在网络中的作用是什么？答：路由器是一种网络设备，用于在不同的网络之间转发数据包。
它通过查找路由表，确定数据包的最佳路径，并将数据包发送到目标网络中的下一个节点。
路由器在网络中起到连接不同网络的桥梁作用，实现了网络之间的通信。
6. 什么是子网？如何计算子网的数量和主机数量？答：子网是对一个网络进行进一步划分的过程，可以将一个大的网络划分为多个较小的子网。
思科认证CCNP经典试题
思科认证CCNP经典试题CCNP经典题目第一部分填空题1、在Cico体系的IGP协议中，RIP的A-D管理距离是，EIGRP的域内A-D管理距离是，EIGRP的域外A-D管理距离是OSPF的A-D管理距离是。
BGP从EBGP学习到的路由学到路由的A-D管理距离是;BGP从IBGP学习到的路由学到路由的A-D管理距离是。
2、BGP的默认MED值为；其中MED越越优选被用于选路；BGP从邻居哪里学到的权重为；BGP自己本路由产生的路由（始发路由）产生权重是；BGP的默认本地优先级为：。
3、BGP的邻居分为和。
4、OSPF在那个区域（有区域0，区域1，区域2）广播多路访问（比如以太网，没有出现外部网络），在区域0可以看到类LSA。
如果想看到2类LSA，必须在网络类型；在NSSA区域可以看到类LSA，在纯粹的NASS区域内是否有5类LSA？（回答是或者否）。
5、HSRP包括哪六种状态？6、OSPF在MA网络链路类型的HELLO报文作用？（3种）7、IPV6的本地链路地址是；本地站点地址是。
（没有/10的写法）8、在选择STP的角色（身份）有哪些？，默认STP的收敛时间为。
配置了portfat后，收敛时间会小于。
9、OSPF发送hello包的组播地址是，EIGRP组播地址是；HSRP发送hello包组播地址是；VRRP发送hello包的组播地址是。
10、目前以太通道最多可以使用条物理线缆逻辑捆绑成一个以太通道接口？形成以太通道方式有。
11、BGP在EBGP中使用属性避免AS间的环路（确保无环），该属性属于BGP的必遵属性，其中还有哪两个是BGP公认必遵属性为和。
第二部分选择1、在对基于CEF的多层交换（MLS）进行排错的时候，例如解决无法到达特定的IP目标等问题，首先需要先查看哪两张表去验证错误？（）A、IP路由表和路由表B、IP路由和CEF邻接关系表C、TCAM中的IPCEFFIB和邻接关系表D、IP路由表和ARP表2、EIGRP位一个混合距离矢量协议，在METRIC值中使用K1-K5五个K值，默认情况下，使用K值分别是（）A、K1，K2BK3,K4C、K1，K5D、K1，K33、OSPF中router-id能标识一台设备的身份，下面说法正确的是（）A、先选举手工配置，然后选择设备loopback地址大的，在选运行了宣告进OSPF最大的物理接口最大的地址。
思科网络基础考题及答案
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在Cisco IOS设备中，启动配置文件存储于何处？
闪存
NVRAM
RAM
ROM
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下列哪三个IPv4地址代表子网的广播？（选择三项）
172.16.4.63 /26
172.16.4.129 /26
172.16.4.191 /26
172.16.4.51 /27
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考试系统
3.参加考试
参加考试- ENetwork Final Exam - CCNA Exploration:网络基础知识(版本4.0)
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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？
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。
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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）
192.168.18.48
192.168.18.49
192.168.18.52
思科第一学期期末考试最新考题CCNA1
Refer to the exhibit. Which Layer 2 protocol could be used nework A and network C?I PT CPU DPE thernetRefer to the exhibit. Which set of devices contains onl intermediary devices?A, B, D, GA, B, E, FC, D, G, IG, H, I, JRefer 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 layernetwork layertransport layerThe Layer 4 header contains which type of information to aid in the delivery of data?service port numberhost logical addressdevice physical addressvirtual connection identifierWhich fiber connector supports full-duplex Ethernet?Which device should be used for routing a packet to a remote network?DHCP serverhubrouterRefer 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.Refer 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 configuration server before reloading. Which action will cause the unmodified data to be saved on the TFTP server?Which 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.What 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.Examine 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 enteredAs network administrator, what is the subnet mask that allows 510 hosts given the IP address 172.30.0.0?255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.128Which OSI layer uses a connection-oriented protocol to ensure reliable delivery of data?application layerpresentation layersession layertransport layerA network has grown too large for technicians to configure network addresses and hosts files for name resolution. Which tw layer services should be added to the server to allow these needs to be satisfied dynamically? (Choose two.)DNSFTPDHCPHTTPSMTPRefer 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: 209.165.202.130A network administrator is asked to design a new addressing scheme for a corporate network. There are 60 users in the ma users 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 researchWhich physical connector type is used for a serial V.35 connection to the CSU/DSU?Refer 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.What 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.Refer 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.Which OSI layer uses the header information to reassemble the data segments into streams?application layernetwork layerpresentation layersession layertransport layerRefer 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?192.168.1.191192.168.1.101192.168.1.1192.168.1.254Refer 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?10.10.10.32192.168.1.5192.168.1.99192.168.2.100Which memory contents will change as a result of using the Router# erase startup-config command on a router?RAMROMflashNVRAMWhile 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)#Refer 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 fa0/1Refer 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 4Refer 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.Refer 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. What information is contained in the header of Layer 3 to help data delivery?port numberdevice physical addressdestination host logical addressvirtual connection identifierA network technician is tasked with setting up a network for six users, but the users should be able to use their accounts to any of the six computers. What type of network should be used?workgroupP2P applicationspeer-to-peer networkclient-server networkRefer 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.Refer 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?Refer 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 browserWhat 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.A network administrator wants to restrict access to the router privileged EXEC mode. Which password should the administrenableauxconsoleVTYWhich 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 /27Refer to the exhibit. Host X is unable to communicate with host Y. Which command can be run at host X to determine which device is responsible for this failure?telnet 192.168.1.1ping 192.168.1.1ftp 192.168.1.1tracert 192.168.1.1Refer to the exhibit. Which option shows the correct topology given the configuration of Router1?If 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.By 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?192.168.3.8192.168.3.16192.168.3.24192.168.3.32Which 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.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.Refer to the exhibit. Which logical topology describes the exhibited network?starringpoint-to-pointmulti-accessRefer 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?10.1.192.110.1.192.210.1.192.54192.31.7.1Which 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.Refer to the exhibit. At which OSI layer is serial interface 0/0/1 experiencing problems?Layer 1Layer 2Layer 3Layer 4Refer 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: 10.10.9.35Refer 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.MUAWhat 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。
思科认证CCNA基础知识之IP地址和子网掩码
思科认证CCNA基础知识之IP地址和子网掩码一、为什么要使用IP地址？一个IP地址是用来标识网络中的一个通信实体，比如一台主机，或者是路由器的某一个端口。
而在基于IP协议网络中传输的数据包，也都必须使用IP地址来进行标识，如同我们写一封信，要标明收信人的通信地址和发信人的地址，而邮政工作人员则通过该地址来决定邮件的去向。
同样的过程也发生在计算机网络里，每个被传输的数据包也要包括的一个源IP地址和一个目的IP地址，当该数据包在网络中进行传输时，这两个地址要保持不变，以确保网络设备总是能根据确定的IP地址，将数据包从源通信实体送往指定的目的通信实体。
目前，IP地址使用32位二进制地址格式，为方便记忆，通常使用以点号划分的十进制来表示，如：202.112.14.1。
一个IP地址主要由两部分组成：一部分是用于标识该地址所从属的网络号；另一部分用于指明该网络上某个特定主机的主机号。
为了给不同规模的网络提供必要的灵活性，IP地址的设计者将IP地址空间划分为五个不同的地址类别，如下表所示，其中A,B,C三类最为常用：A类0－127 0 8位24位B类128－191 10 16位16位C类192－223 110 24位8位D类224－239 1110 组播地址E类240－255 1111 保留试验使用网络号由因特网权力机构分配，目的是为了保证网络地址的全球唯一性。
主机地址由各个网络的管理员统一分配。
因此，网络地址的唯一性与网络内主机地址的唯一性确保了IP 地址的全球唯一性。
二、划分子网为了提高IP地址的使用效率，可将一个网络划分为子网：采用借位的方式，从主机位最高位开始借位变为新的子网位，所剩余的部分则仍为主机位。
这使得IP地址的结构分为三部分：网络位、子网位和主机位。
引入子网概念后，网络位加上子网位才能全局唯一地标识一个网络。
把所有的网络位用1来标识，主机位用0来标识，就得到了子网掩码。
如下图所示的子网掩码转换为十进制之后为：255.255.255.224子网编址使得IP地址具有一定的内部层次结构，这种层次结构便于IP地址分配和管理。
（最新）思科网络第一学期1-5章中文测试题及答案
ENetwork Chapter 2 - CCNA Exploration: 网络基础知识(版本 4.0) 1在封装过程中，数据链路层执行什么操作？不添加地址。
添加逻辑地址。
添加物理地址。
添加进程的端口号。
2TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表、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3数据链路层封装添加的报尾信息有何主要功能？支持差错校验确保数据按照顺序到达确保送达正确目的标识本地网络中的设备帮助中间设备进行处理和路径选择4请参见图。
下列哪组设备仅包含终端设备？A、C、DB、E、G、HC、D、G、H、I、JD、E、F、H、I、JE、F、H、I J5OSI 模型各层从最高层到最低层的正确顺序如何？物理层、网络层、应用层、数据链路层、表示层、会话层、传输层应用层、物理层、会话层、传输层网络层、数据链路层、表示层应用层、表示层、物理层、会话层、数据链路层、传输层、网络层应用层、表示层、会话层、传输层、网络层、数据链路层、物理层表示层、数据链路层、会话层、传输层、网络层、物理层、应用层6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)。
7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8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9请参见图示。
哪个术语正确判断出了包含于绿色区域中的设备类型？源终端传输中间10OSI 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11请参见图示。
ccna测试题及答案
ccna测试题及答案CCNA测试题及答案一、选择题1. 在Cisco设备上，以下哪个命令用于查看当前的路由表？A. show ip routeB. show running-configC. show interface statusD. show version答案：A2. 以下哪个协议用于在网络中自动发现其他设备？A. ARPB. CDPC. ICMPD. TCP答案：B3. 以下哪个命令用于配置Cisco设备上的接口？A. configure terminalB. interfaceC. ip addressD. hostname答案：A二、填空题4. 在Cisco设备上，使用命令_________可以查看接口的配置信息。
答案：show interface5. 静态路由配置中，_________命令用于指定下一跳地址。
答案：ip route6. 动态路由协议可以自动适应网络变化，其中_________是最常见的一种。
答案：RIP（路由信息协议）三、简答题7. 请简述VLAN（虚拟局域网）的作用。
答案：VLAN是一种将局域网内不同物理位置的设备划分为同一逻辑网络的技术，主要用于隔离广播域，提高网络的安全性和效率。
8. 描述交换机和路由器在网络中的基本功能。
答案：交换机主要用于局域网内部，通过MAC地址表来转发数据帧，实现数据包在局域网内的快速交换。
路由器则工作在网络层，使用IP地址来转发数据包，连接不同的网络，并进行路径选择。
四、计算题9. 假设一个子网掩码为255.255.255.192，计算这个子网的可用IP地址范围。
答案：可用IP地址范围为192.168.1.0到192.168.1.62（包含两端）。
五、实验题10. 请根据以下配置文件，列出Router1的接口配置信息。
```Router1show running-configinterface FastEthernet0/0ip address 192.168.1.1 255.255.255.0duplex autospeed auto!interface FastEthernet0/1no ip addressshutdown!interface Serial0/0/0ip address 10.0.0.1 255.255.255.252clock rate 64000!router ospf 1network 192.168.1.0 0.0.0.255 area 0network 10.0.0.0 0.0.0.3 area 0!```答案：- FastEthernet0/0: IP地址为192.168.1.1，子网掩码为255.255.255.0，双工模式和速度均为自动。