CCNA测试题
CCNA认证基础试卷A-参考答案
1 CCNA认证基础考卷参考答案(A卷)考试时间年月日(120分钟) 课程CCNA基础教师签名_____一、选择题(每题2分,共30分)二、名词解释(每题2分,共10分)三、简单题(每题15分,共60分)1、答:2、答:物理拓扑是指介质的实际布局。
常见的物理拓扑有总线型、环形、星型、扩展星型、树型、网状等逻辑拓扑是指主机访问介质的方法。
常见的有总线型和令牌环型。
3、答UTP线缆分为直连线、交叉线、全反线直连线按照568B的线序标准应该是两端相同,都为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕,一般用于主机到交换机、主机到集线器、路由器到交换机、路由器到集线器等。
交叉线按照568B的线序标准应该是两端的1-3、2-6交叉,一端为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕,另一端为白绿、绿、白橙、蓝、白蓝、橙、白棕、棕;一般用于同样类型的两台设备直连一级集线器到交换机,主机到路由器的连接。
全反线的线序为两端线序完全相反,一端为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕,另一端则线序全部相反,为棕、白棕、绿、白蓝、蓝、白绿、橙、白橙。
全反线只用于计算机的串口与网络设备的控制台端口连接。
4、答:相同点:1)路由器和第3层交换机都是第3层的设备2)路由器和第3层交换机都具有路由功能3)路由器和第3层交换机都能够提供子网(或VLAN)间的通信4)路由器和第3层交换机都主要用于主干网上不同点:1)接口工作层次:路由器的接口只工作在第3层(路由接口)上,第3层交换机的接口可独自工作在第2层(交换接口)或第3层(路由接口)上。
2)软硬件实现:路由器是基于软件的路由设备,第3层交换机是硬件化的路由设备3)转发性能:路由器实现高转发性能的代价远高于第3层交换机4)接口类型:路由器的接口类型远丰富于第3层交换机5)路由能力:路由器的路由能力强大,第3层交换机的路由能力只需满足一般需要即可。
(路由协议、转发机制)6)应用场合:广域主干网中一般使用路由器,园区主干网中通常使用第3层交换机一、填空(每空2分,共20分)1如图所示,路由器A和B已经配置使用RIP作为动态路由协议,且路由器A和B上的所有接口都报告“interface is up, line protocol is up”。
完整版CCNA测试题库及答案
完整版CCNA测试题库及答案描述载波侦听多路由访问/冲突检测(CSMA/CD)的工作原理。
CSMA/CD是一种帮助设备均衡共享带宽的协议,可避免两台设备同时在网络介质上传输数据。
虽然他不能消除冲突,但有助于极大的减少冲突,进而避免重传,从而提高所的设备的数据传输效率。
区分半双工和全双工通信。
并指出两种方法的需求。
与半双工以太网使用一对导线不同,全双工以太网使用两队导线,全双工使用不同的导线来消除冲突,从而允许同时发送和接收数据,而半双工可接收或发送数据,但不能同时接收和发送数据,且仍会出现冲突。
要使用全双工,电缆两端的设备都必须支持全双工,并配置成一全双模式运行。
描述MAC地址的组成部分以及各部分包含的信息。
MAC(硬件)地址时一种使用十六进制表示的地址,长48位(6B)。
其中前24位(3B)称为OUI(Organizationally Unique Idebtifier,组织唯一表示符),有IEEE分配给NIC制造商;余下的部分呢唯一地标识了NIC识别十进制数对应的二进制值和十六进制值。
用这三种格式之一表示的任何数字都可以转换为其他两种格式,能够执行这种转换对理解IP地址和子网划分至关重要。
识别以太网帧中与数据链路层相关的字段。
在以太网中,与数据链路层相关的字段包括前导码,帧其实位置分隔符,目标MAC地址,源MAC地址,长度或者类型以及帧校验序列。
识别以太网布线相关的IEEE标准。
这些标准描述了各种电缆类型的功能和物理特征,包括(但不限于)10Base2、10Base5和10BaseT。
区分以太网电缆类型及其用途。
以太网电缆分3种:直通电缆,用于将PC或路由器的以太网接口连接到集线器或交换机;交叉电缆。
用于将集线器连接到集线器,集线器连接到交换机,交换机连接到交换机以及PC连接到PC;反转电缆,用于PC和路由器或交换机之间建立控制台连接。
描述数据封装过程及其在分组创建中的作用。
数据封装指的是在OSI模型各层给数据添加信息的过程,也成为分组创建。
CCNA网络学院第一学期 第十一章配置和测试网络 试题及答案
第十一章配置和测试网络001网络中的用户发现向远程服务器传输文件时响应很慢。
发出什么命令可以确定路由器是否存在任何输入或输出错误?A show running-configB show startup-configC show interfacesD show ip routeE show versionF show memory002请参见图示。
技术人员将图示中的配置应用于全新的路由器。
为了验证配置,技术人员在与该路由器的CLI 会话中发出了show running-config命令。
技术人员在路由器的show running-config命令输出中应看到哪几行结果?A enable password class line console 0 password ccnaB enable secret cisco enable password class line console 0 password ccnaC enable secret 5 $1$v0/3$QyQWmJyT7zCa/yaBRasJm0 enable password class line console 0 password ccnaD enable secret cisco enable password 7 14141E0A1F17 line console 0 password 7 020507550AE enable secret 5 $1$v0/3$QyQWmJyT7zCa/yaBRasJm0 line console 0 password 7 020507550A 003Cisco 路由器上的哪个接口将用于初始配置?A B CD004路由器B 和C 之间的连接测试获得成功。
但是,重新启动路由器C 之后,管理员注意到网络10.10.3.0 和10.10.4.0 之间的响应时间变慢。
两台路由器之间可以成功Ping 通。
实验 2.8.2:静态路由配置练习
实验 2.8.2:静态路由配置练习拓扑图地址表设备接口IP 地址子网掩码默认网关Fa0/0 不适用BRANCHS0/0/0 不适用Fa0/0 不适用HQS0/0/0 不适用S0/0/1 209.165.201.2 255.255.255.252 不适用Fa0/0 209.165.200.225 255.255.255.224 不适用ISPS/0/0 209.165.201.1 255.255.255.252 不适用PC1 网卡PC2 网卡Web 服务器网卡209.165.200.253 255.255.255.224 209.165.200.225学习目标完成本实验后,您将能够:•根据指定的要求对地址空间划分子网。
•为接口分配适当的地址,并进行记录。
•根据拓扑图进行网络布线。
•清除启动配置并将路由器重新加载为默认状态。
•在路由器上执行基本配置任务。
•配置并激活串行接口和以太网接口。
•确定适当的静态路由、总结路由和默认路由。
•测试并校验配置。
•思考网络实施并整理成文档。
场景在本次实验练习中,您将得到一个网络地址,您必须对其进行子网划分以便完成如拓扑结构图所示的网络编址。
连接到 ISP 路由器的 LAN 编址和 HQ 与 ISP 路由器之间的链路已经完成。
但还需要配置静态路由以便非直连网络中的主机能够彼此通信。
任务 1:对地址空间划分子网。
步骤 1:研究网络要求。
连接到 ISP 路由器的 LAN 编址和 HQ 与 ISP 路由器之间的链路已经完成。
在您的网络设计中,您可以使用 192.168.2.0/24 地址空间。
请对该网络进行子网划分,以提供足够的 IP 地址来支持 60 台主机。
步骤 2:创建网络设计时请思考以下问题:需要将 192.168.2.0/24 网络划分为多少个子网? __________这些子网的网络地址分别是什么?子网 0: ________________________________________子网 1: ________________________________________子网 2: ________________________________________子网 3: ________________________________________这些网络以点分十进制格式表示的子网掩码是什么? __________________________以斜杠格式表示的网络子网掩码是什么? __________每个子网可支持多少台主机? __________步骤 3:为拓扑图分配子网地址。
CCNA第四学期官方章节考试题之第四学期《Final_Examination》(附答案)
公司与AA2SSH存在不正确的访问控制列表条目。
访问列表中的必须在会防止以明文传输登录信息如果身份验证失败,则会断开PPP 会话连接会发起双向握手容易遭受回送攻击4命令show frame-relay map的输出如下:Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active 下列哪三种说法正确描述了所示内容的意义?(选择三项。
)192.168.151.4代表远程路由器的IP 地址192.168.151.4代表本地串行接口的IP 地址DLCI 122代表远程串行接口DLCI 122代表用于连接远程地址的本地编号broadcast表示动态路由协议(例如RIP v1)可通过此PVC 发送数据包active表明ARP 进程正在工作5路由器的SDM 主页会显示哪三点信息?(选择三项。
)ARP 缓存闪存的总容量和可用容量路由表已配置的LAN 接口的数量是否配置了DHCP 服务器该LAN 中路由器的数量6从非军事区分界点本地环路网云确保在确认确保路由器上有通向下列哪三种说法正确描述了CSU/DSU调制解调器用于端接本地数字环路。
CSU/DSU调制解调器用于端接本地模拟环路。
路由器通常被视为路由器通常被视为10在链路质量测试完毕后,路由器在协商第LCPNCP它会被丢弃。
它会被放到队列中,直到主机它会被转换,源端口号保持为它会被分配其端口范围内的第一个可用端口号。
交换虚电路的相关信息将DLCI 映射到网络地址提供流量控制提供错误通知提供拥塞通知发送keepalive 数据包以检验PVC 的工作情况14请参见图示。
下列说法中哪三项正确?(选择三项。
)启用了NAT 过载。
启用了动态NAT。
地址转换会失败。
接口配置不正确。
地址为192.168.1.255 的主机将被转换。
进入0/0/2 接口的流量先被转换,然后才流出串行接口0/0/0。
ERouting Final Exam - CCNA Exploration 路由协议和概念 (版本 4.0) (思科第二学期期末答案)
ERouting Final Exam - CCNA Exploration: 路由协议和概念 (版本 4.0) (思科第二学期期末答案)参加考试 - ERouting Final Exam - CCNA Exploration: 路由协议和概念 (版本 4.0)1.请参见图示。
哪一项是对连接到路由器 R1 的路由的最有效总结?198.18.0.0/16198.18.48.0/21198.18.32.0/22198.18.48.0/23198.18.49.0/23198.18.52.0/222.下列关于路由协议的陈述,哪三项是正确的?(选择三项。
)EIGRP 支持不等价负载均衡。
RIP 无法配置为允许无类路由。
OSPF 在多路访问链路上选举指定路由器。
RIP 不通告跳数超过 15 的路由。
EIGRP 使用广播流量与其邻居建立相邻关系。
OSPF 能够更迅速地收敛,因为在后继路由失效时,它能够在其拓扑表中找出可行后继路由。
3.请参见图示。
该网络正在运行 RIP 路由协议。
网络 10.0.0.0 突然断开。
下列有关此拓扑结构中路由器如何响应该事件的陈述中,哪一项是正确的?Router4 将在 30 秒之后的下一次定期更新中获知该失效路由。
在抑制计时器超时之前,水平分割将阻止 Router4 向 10.0.0.0 网络转发数据包。
Router5 将立即从路由表中清除这一失效路由。
Router5 将向 Router4 发送触发更新,其中网络 10.0.0.0 的度量为 16。
4.请参见图示。
根据图中所示的拓扑结构,要在 Paris 路由器上配置 EIGRP 需要使用哪三条命令?(选择三项。
)Paris(config)# router eigrp 100Paris(config)# router eigrpParis(config-router)# network 192.168.6.0Paris(config-router)# network 192.168.7.0Paris(config-router)# network 192.168.8.0Paris(config-router)# network 192.168.9.05.请参见图示。
CCNA实验教程
福建最好的培训中心福建最大的CISCO实验室3名CCIE,100多套CISCO设备PIX防火墙,3550交换机,7000路由器,两条ISDN线路基带MODEM,电话交换机,NETSCREEN防火墙登录微思实验室:远程: telnet://本地: telnet:192.168.10.251• Lab 1 - Basic Router Configuration• Lab 2 - Advanced Router Configuration• Lab 3 - CDP• Lab 4 - Telnet• Lab 5 - TFTP• Lab 6 - RIP• Lab 7 - IGRP• Lab 8 - EIGRP• Lab 9 - OSPF• Lab 10 – Catalyst 1900 Switch Configuration• Lab 11 - VLANs & Trunking (Catalyst 1900)• Lab 12 - Catalyst 2950 Switch Configuration• Lab 13 - VLANs and Trunking (Catalyst 2950)• Lab 13-1 Routing inter VLAN(Dot1q)• Lab 14 - IP Access Lists• Lab 15 - NAT/PAT• Lab 16 - PPP & CHAP• Lab 17 - ISDN BRI-BRI using Legacy DDR• Lab 18 - ISDN BRI-BRI using Dialer Profiles• Lab 19 - ISDN PRI using Dialer Profiles• Lab 20 - Frame RelayLAB 1 –基本配置3. 用户模式Router>4. Router> enable //用户模式敲入enable进入到特权模式Router#5. Router# ? //敲入问号看帮助6. Router# disable //特权模式敲入disable退到用户模式Router>7. Router> enable //用户模式敲入enable进入到特权模式Router# configure terminal //特权模式敲入configure terminal进入配置模式Router(config)# //配置模式8. 配置路由器名字(主机名)如…R1‟ (注:如果你用的实验台号是03,则命名为na03r1,如果为12,则命名na12r1,依次类推).Router(config)# hostname na12r1 //把第12号实验台的第一台路由器命名为na12r1na12r1(config)#9. 配置路由器的密码:●配置console 口密码:R1(config)#line console 0R1(config-line)#loginR1(config-line)#password ciscoR1(config-line)#设置密码后:00:29:42: %SYS-5-CONFIG_I: Configured from console by consoleUser Access VerificationPassword:Password: //这里要输入console口密码●配置enable 密码//从用户模式到enable模式的密码问题A: when both encrypted and unencrypted enable passwords are configured, which one is used?R1(config)# enable password cisco//密码显示为明文R1(config)# enable secret wisdom//密码为加密过的,显示为乱码注:用命令show running-config 可以看到密码cisco为明文,密码wisdom显示为乱码,当两个密码都配置时,只有enable secret所跟的密码生效,两个密码不可以配置一样的密码.配置vty密码//远程登陆telnet 的密码R1(config)#line vty 0 4R1(config-line)#loginR1(config-line)#password ciscoR1(config-line)#telnet命令的使用: telnet +IP address or hostname of a remote system例如: telnet 192.168.10.25110. 配置路由器接口ethernet0的IP address:R1>enableR1#configure terminalR1(config)#interface ethernet 0R1(config-if)#ip address 11.1.1.1 255.255.255.0R1(config-if)#no shutdown11. 在Serial0口配置R1(config-if)# int serial 0R1(config-if)# ip address 12.1.1.1 255.255.255.0R1(config-if)# no shutdown12. 测试ctrl-z的作用R1(config-if)# ctrl-z 任何模式下敲入ctrl-z都会退回到特权模式R1# 特权模式13. 退出路由器R1# logout 完全退出路由器14. 回到特权模式R1> enablepassword: cisco 输入enable secret 的密码为ciscoR1#15.显示接口的基本概况:R1# show ip interface brief16. 显示详细信息:show interface +接口类型+接口偏号例如:R1# show interfaces ethernet0 或是show interface serial 0R1#show interfaces ethernet 0Ethernet0 is up, line protocol is downHardware is Lance, address is 0000.0c92.8164 (bia 0000.0c92.8164)Internet address is 11.1.1.1/24MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 145/255, load 1/255 ……………….…………17.显示内存信息(也就是路由器正在运行的配置):R1# show running-config //当前正在远行的配置18. 显示NVRAM? If not, why not?R1# show startup-config 显示已经保存过的配置19. 保存配置:R1# copy running-config startup-config或是R1#write保存配置:copy running-config startup-config等同于write20. 现在显示NVRAM.R1# show startup-config21. 使用Show version:问题A: What IOS release is running在R1? 查看IOS的版本问题B: What are the contents of the configuration register? 查看寄存器的值R1# show version22. 查看运行的协议问题A:which protocols are currently running on the router?R1# show ip protocols23. 进入另一台Router.Router> enableRouter# configure terminalRouter(config)#24. 配置主机名,配置密码.Router(config)# hostname R2R2(config)# enable secret cisco25. 配置以太网IP.R2(config)# interface e0R2(config-if)# ip address 220.1.1.2 255.255.255.0R2(config-if)# no shutdown26. 显示所有接口简单信息R2(config-if)# ctrl-zR2# show ip interface briefR1#show ip interface briefInterface IP-Address OK? Method Status ProtocolEthernet0 11.1.1.1 YES manual up down Serial0 unassigned YES unset administratively down down Serial1 unassigned YES unset administratively down down3. 配置登陆信息Banner”Welcome to WISDOM LAB - Authorized Users Only”.R1(config)# banner motd #Welcome to WISDOM LAB - Authorized Users Only #4. 退出路由器,重新登录.R1# logoutenterpassword: ciscoR1> enablepassword: cisco6. 在R1上将R2和12.1.1.2对应起来(相当于Windows里的Hosts文件的作用)。
新10月CCNA题库word版1~100题共24页
QUESTION 1When you are logged into a switch, which prompt indicates that you are in privileged mode?A. %B. @C. >D. $E. #QUESTION 2Which command shows system hardware and software version information?A. show configurationB. show environmentC. show inventoryD. show platformE. show versionQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Qtrunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 thenative VLAN is not specified.What will happen in this scenario?A. 802.1Q giants frames could saturate the link.B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.C. A native VLAN mismatch error message will appear.D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.QUESTION 4Which command would correctly configure a serial port on a router with the last usable host address in the192.216.32.32/29 subnet?A. Router(config-if)# ip address 192.216.32.38 255.255.255.240B. Router(config-if)# ip address 192.216.32.39 255.255.255.224C. Router(config-if)# ip address 192.216.32.63 255.255.255.248D. Router(config-if)# ip address 192.216.32.39 255.255.255.248E. Router(config-if)# ip address 192.216.32.63 255.255.255.248F. Router(config-if)# ip address 192.216.32.38 255.255.255.248QUESTION 5The network default gateway applying to a host by DHCP is 192.168.5.33/28. Which option is the valid IPaddress of this host?A. 192.168.5.55B. 192.168.5.47C. 192.168.5.40D. 192.168.5.32E. 192.168.5.14QUESTION 6Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0? (Choose two.)A. 113.10.4.0B. 186.54.3.0C. 175.33.3.255D. 26.35.2.255E. 17.35.36.0QUESTION 7The network administrator has asked you to check the status of the workstation's IP stack by pinging theloopback address. Which address would you ping to perform this task?A. 10.1.1.1B. 127.0.0.1C. 192.168.0.1D. 239.1.1.1QUESTION 8Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IPaddress of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts toping between the hosts are unsuccessful. What two things can be done to allow communications betweenthe hosts? (Choose two.)A. Replace the straight-through cable with a crossover cable.B. Change the subnet mask of the hosts to /25.C. Change the subnet mask of the hosts to /26.D. Change the address of Workstation A to 192.0.2.15.E. Change the address of Workstation B to 192.0.2.111.QUESTION 9Your ISP has given you the address 223.5.14.6/29 to assign to your router's interface. They have alsogiven you the default gateway address of 223.5.14.7. After you have configured the address, the router isunable to ping any remote devices. What is preventing the router from pinging remote devices?A. The default gateway is not an address on this subnet.B. The default gateway is the broadcast address for this subnet.C. The IP address is the broadcast address for this subnet.D. The IP address is an invalid class D multicast address.QUESTION 10Which command is used to copy the configuration from RAM into NVRAM?A. copy running-config startup-configB. copy startup-config: running-config:C. copy running config startup configD. copy startup config running configE. write terminalQUESTION 11Which command is used to load a configuration from a TFTP server and merge the configuration intoRAM?A. copy running-config: TFTP:B. copy TFTP: running-configC. copy TFTP: startup-configD. copy startup-config: TFTP:QUESTION 12A system administrator types the command to change the hostname of a router. Where on the Cisco IFS isthat change stored?A. NVRAMB. RAMC. FLASHD. ROME. PCMCIAQUESTION 13Which command is used to configure a default route?A. ip route 172.16.1.0 255.255.255.0 0.0.0.0B. ip route 172.16.1.0 255.255.255.0 172.16.2.1C. ip route 0.0.0.0 255.255.255.0 172.16.2.1D. ip route 0.0.0.0 0.0.0.0 172.16.2.1QUESTION 14If IP routing is enabled, which two commands set the gateway of last resort to the default gateway?(Choose two.)A. ip default-gateway 0.0.0.0B. ip route 172.16.2.1 0.0.0.0 0.0.0.0C. ip default-network 0.0.0.0D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1E. ip route 0.0.0.0 0.0.0.0 172.16.2.1QUESTION 15Which command would you configure globally on a Cisco router that would allow you to view directlyconnected Cisco devices?A. enable cdpB. cdp enableC. cdp runD. run cdpQUESTION 16Which command is used to see the path taken by packets across an IP network?A. show ip routeB. show routeC. tracerouteD. trace ip routeQUESTION 17Which command is used to debug a ping command?A. debug icmpB. debug ip icmpC. debug tcpD. debug packetQUESTION 18Which command displays CPU utilization?A. show protocolsB. show processC. show systemD. show versionQUESTION 19When configuring a serial interface on a router, what is the default encapsulation?A. atm-dxiB. frame-relayC. hdlcD. lapbE. pppQUESTION 20What must be set correctly when configuring a serial interface so that higher-level protocols calculate thebest route?A. bandwidthB. delayC. loadD. reliabilityQUESTION 21A company implements video conferencing over IP on their Ethernet LAN. The users notice that thenetwork slows down, and the video either stutters or fails completely. What is the most likely reason forthis?A. minimum cell rate (MCR)B. quality of service (QoS)C. modulationD. packet switching exchange (PSE)E. reliable transport protocol (RTP)QUESTION 22Which layer in the OSI reference model is responsible for determining the availability of the receivingprogram and checking to see if enough resources exist for that communication?A. transportB. networkC. presentationD. sessionE. applicationQUESTION 23Data transfer is slow between the source and destination. The quality of service requested by the transportlayer in the OSI reference model is not being maintained. To fix this issue, at which layer should thetroubleshooting process begin?A. presentationB. sessionC. transportD. networkE. physicalQUESTION 24Which protocols are found in the network layer of the OSI reference model and are responsible for pathdetermination and traffic switching?A. LANB. routingC. WAND. networkQUESTION 25Which command reveals the last method used to powercycle a router?A. show reloadB. show bootC. show running-configD. show versionQUESTION 26Which three options are valid WAN connectivity methods? (Choose three.)A. PPPB. WAPC. HDLCD. MPLSE. L2TPv3CCNA考试报名1700元7F. ATMQUESTION 27Refer to the exhibit. Which WAN protocol is being used?A. ATMB. HDLCC. Frame RelayD. PPPQUESTION 28What is the difference between a CSU/DSU and a modem?A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signalsfrom a router to a leased line.B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signalsfrom a router to a leased line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signalsfrom a router to a phone line.D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signalsfrom a router to a phone line.QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attachedCCNA考试报名1700元8host devices. What would be the most efficient way to configure MAC-level security on all these ports?A. Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port securitymac-address command.B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port securitymac-address command.C. Use the switchport port-security MAC address sticky command on all the switch ports that have enddevices connected to them.D. Use show mac-address-table to determine the addresses that are associated with each portand thenenter the commands on each switch for MAC address port-security.QUESTION 30When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?A. Set the encapsulation of the interface to HDLC.B. Place the CSU/DSU in local-loop mode.C. Enable local-loop mode on the DCE Frame Relay router.D. Verify that the encapsulation is set to Frame Relay.What occurs on a Frame Relay network when the CIR is exceeded?A. All TCP traffic is marked discard eligible.B. All UDP traffic is marked discard eligible and a BECN is sent.C. All TCP traffic is marked discard eligible and a BECN is sent.D. All traffic exceeding the CIR is marked discard eligible.QUESTION 32What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)A. They create split-horizon issues.B. They require a unique subnet within a routing domain.C. They emulate leased lines.D. They are ideal for full-mesh topologies.E. They require the use of NBMA options when using OSPF.QUESTION 33Refer to the exhibit. Addresses within the range 10.10.10.0/24 are not being translated to the 1.128.0/16range. Which command shows if 10.10.10.0/24 are allowed inside addresses?A. debug ip natB. show access-listC. show ip nat translationD. show ip nat statisticsQUESTION 34A wireless client cannot connect to an 802.11b/g BSS with a b/g wireless card. The client section of theaccess point does not list any active WLAN clients. What is a possible reason for this?A. The incorrect channel is configured on the client.B. The client's IP address is on the wrong subnet.C. The client has an incorrect pre-shared key.D. The SSID is configured incorrectly on the client.QUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.)CCNA考试报名1700元10艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyA. a stronger encryption algorithmB. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vectorE. per frame sequence countersQUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.)A. WEPB. CCKMC. AESD. TKIPE. CCMPQUESTION 37What are two characteristics of RIPv2? (Choose two.)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute pathQUESTION 38Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A. 1000BASE-CXCCNA考试报名1700元11艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXQUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.QUESTION 40Refer to the exhibit. According to the routing table, where will the router send a packet destined for10.1.5.65?A. 10.1.1.2B. 10.1.2.2C. 10.1.3.3D. 10.1.4.4QUESTION 41Which command shows if an access list is assigned to an interface?A. show ip interface [interface] access-listsB. show ip access-lists interface [interface]C. show ip interface [interface]D. show ip access-lists [interface]QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?A. The address is removed from the pool until the conflict is resolved.B. The address remains in the pool until the conflict is resolved.C. Only the IP detected by Gratuitous ARP is removed from the pool.D. Only the IP detected by Ping is removed from the pool.E. The IP will be shown, even after the conflict is resolved.QUESTION 43Refer to the exhibit. You are connected to the router as user Mike. Which command allows you to seeoutput from the OSPF debug command?A. terminal monitorB. show debuggingC. show sessionsD. show ip ospf interfaceQUESTION 44Refer to the exhibit. If number 2 is selected from the setup script, what happens when the user runs setupfrom a privileged prompt?A. Setup is additive and any changes will be added to the config script.B. Setup effectively starts the configuration over as if the router was booted for the first time.C. Setup will not run if an enable secret password exists on the router.D. Setup will not run, because it is only viable when no configuration exists on the router. QUESTION 45Refer to the exhibit. Which (config-router) command will allow the network represented on the interface tobe advertised by RIP?A. redistribute ethernet0B. network ethernet0CCNA考试报名1700元14艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyC. redistribute 10.12.0.0D. network 10.12.0.0QUESTION 46Refer to the exhibit. What information can be gathered from the output?A. One router is running RIPv1.B. RIP neighbor is 224.0.0.9.C. The network contains a loop.D. Network 10.10.1.0 is reachable.QUESTION 47Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A. PC to routerB. PC to switchC. server to routerD. router to routerQUESTION 48Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A. PC to routerB. PC to switchC. server to switchD. switch to routerQUESTION 49Which two statements describe the Cisco implementation of VLANs? (Choose two.)A. VLAN 1 is the default Ethernet VLAN.B. CDP advertisements are only sent on VLAN 1002.C. By default, the management VLAN is VLAN 1005.D. By default, the switch IP address is in VLAN 1005.E. VLAN 1002 through 1005 are automatically created and cannot be deleted.QUESTION 50Refer to the exhibit. What can be determined about the router from the console output?A. No configuration file was found in NVRAM.B. No configuration file was found in flash.C. No configuration file was found in the PCMCIA card.D. Configuration file is normal and will load in 15 seconds.QUESTION 52Refer to the exhibit. Which command would allow the translations to be created on the router?A. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 19B. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 19C. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 18D. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 18QUESTION 53Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output asshown. At which OSI layer is the problem?A. data link layerB. application layerC. access layerD. session layerE. network layerQUESTION 54Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection?A. 10.0.0.0B. 10.0.0.254C. 192.223.129.0D. 192.223.129.254QUESTION 55Refer to the exhibit. The user at Workstation B reports that Server A cannot be reached. What is preventing Workstation B from reaching Server A?A. The IP address for Server A is a broadcast address.B. The IP address for Workstation B is a subnet address.C. The gateway for Workstation B is not on the same subnet.D. The gateway for Server A is not on the same subnet.QUESTION 56Refer to the exhibit. What does the (*) represent in the output?A. Packet is destined for a local interface to the router.B. Packet was translated, but no response was received from the distant device.C. Packet was not translated, because no additional ports are available.D. Packet was translated and fast switched to the destination.QUESTION 57Refer to the exhibit. What command sequence will enable PAT from the inside to outside network?A. (config) ip nat pool isp-net 1.2.4.2 netmask 255.255.255.0 overloadB. (config-if) ip nat outside overloadC. (config) ip nat inside source list 1 interface ethernet1 overloadD. (config-if) ip nat inside overloadQUESTION 58Refer to the exhibit. What will happen to HTTP traffic coming from the Internet that is destined for172.16.12.10 if the traffic is processed by this ACL?A. Traffic will be dropped per line 30 of the ACL.B. Traffic will be accepted per line 40 of the ACL.C. Traffic will be dropped, because of the implicit deny all at the end of the ACL.D. Traffic will be accepted, because the source address is not covered by the ACL.QUESTION 59Refer to the exhibit. Which statement describes the effect that the Router1 configuration has on devices inthe 172.16.16.0 subnet when they try to connect to SVR-A using Telnet or SSH?A. Devices will not be able to use Telnet or SSH.B. Devices will be able to use SSH, but not Telnet.C. Devices will be able to use Telnet, but not SSH.D. Devices will be able to use Telnet and SSH.QUESTION 60What are three advantages of VLANs? (Choose three.)A. VLANs establish broadcast domains in switched networks.B. VLANs utilize packet filtering to enhance network security.C. VLANs provide a method of conserving IP addresses in large networks.D. VLANs provide a low-latency internetworking alternative to routed networks.E. VLANs allow access to network services based on department, not physical location.F. VLANs can greatly simplify adding, moving, or changing hosts on the network.QUESTION 61An administrator would like to configure a switch over a virtual terminal connection from locations outsideof the local LAN. Which of the following are required in order for the switch to be configured from a remotelocation? (Choose two.)A. The switch must be configured with an IP address, subnet mask, and default gateway.B. The switch must be connected to a router over a VLAN trunk.C. The switch must be reachable through a port connected to its management VLAN.D. The switch console port must be connected to the Ethernet LAN.E. The switch management VLAN must be created and have a membership of at least one switch port.F. The switch must be fully configured as an SNMP agent.QUESTION 62Which of the following host addresses are members of networks that can be routed across the publicInternet? (Choose three.)A. 10.172.13.65B. 172.16.223.125C. 172.64.12.29D. 192.168.23.252E. 198.234.12.95F. 212.193.48.254QUESTION 63Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to networkhosts? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.192QUESTION 64Which of the following are benefits of VLANs? (Choose three.)A. They increase the size of collision domains.B. They allow logical grouping of users by function.C. They can enhance network security.D. They increase the size of broadcast domains while decreasing the number of collision domains.E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.F. They simplify switch administration.Which router IOS commands can be used to troubleshoot LAN connectivity problems? (Choose three.)A. pingB. tracertC. ipconfigD. show ip routeE. winipcfgF. show interfacesQUESTION 67。
CCNA路由部分测试题(含答案)
CCNA路由部分测试题(共50题)1.当路由器接收的IP报文的目的地址不是本路由器的接口IP地址,并且在路由表中未找到匹配的路由项,采取的策略是什么?A.丢掉该分组B.将该分组分片C.转发该分组D.以上答案均不对ANSWER:A2.IGP 的作用范围是?A.区域内B.自然子网范围内C.局域网内D.自治系统内ANSWER:D3.距离矢量协议包括?(多选)A.RIPB.IS-ISC.OSPFD.EIGRPANSWER:A D4.解决路由环问题的办法是?(多选)A.定义路由权的最大值B.路由保持法C.水平分割D.路由器重启ANSWER:A B C5.在rip 中metric 等于什么值为不可达?A.8B.10C.15D.16ANSWER:D6.下列关于OSPF 协议的说法正确的是?(多选)A.OSPF 支持基于接口的报文验证B.OSPF 支持到同一目的地址的多条等值路由C.OSPF 是一个基于链路状态算法的边界网关路由协议D.OSPF 发现的路由可以根据不同的类型而有不同的优先级ANSWER:A B D7.如果一个内部网络对外的出口只有一个,那么最好配置?A.缺省路由B.主机路由C.动态路由ANSWER:A8.以下不属于动态路由协议的是?A.RIPB.ICMPC.EIGRPD.OSPFANSWER:B9.关于矢量距离算法以下哪些说法是错误的?A.矢量距离算法不会产生路由环路问题B.矢量距离算法是靠传递路由信息来实现的C.路由信息的矢量表示法是(目标网络,metric)D.使用矢量距离算法的协议只从自己的邻居获得信息ANSWER:A10.以下哪些路由表项要由网络管理员手动配置?(多选)A.静态路由B.直接路由C.缺省路由D.动态路由ANSWER:A C11.关于RIP 协议,下列说法正确的有?(多选)A.RIP 协议是一种IGPB.RIP 协议是一种EGPC.RIP 协议是一种距离矢量路由协议D.RIP 协议是一种链路状态路由协议ANSWER:A C12.下列关于链路状态算法的说法正确的是?(多选)A.链路状态是对路由的描述B.链路状态是对网络拓扑结构的描述C.链路状态算法本身不会产生自环路由D.OSPF 和RIP 都使用链路状态算法ANSWER:B C13.路由器中时刻维持着一张路由表,这张路由表可以是静态配置的,也可以是什么协议产生的?A.生成树协议B.链路控制协议C.动态路由协议D.被承载网络层协议ANSWER:C14.在路由器中,如果去往同一目的地有多条路由,则决定最佳路由的因素有?(多选)A.路由的优先级B.路由的发布者C.路由的metric 值D.路由的生存时间ANSWER:A C15.下面哪一项正确描述了路由协议?A.允许数据包在主机间转送的一种协议B.定义数据包中域的格式和用法的一种方式C.通过执行一个算法来完成路由选择的一个协议D.指定MAC 地址和IP 地址捆绑的方式和时间的一种协议ANSWER:C16.IGP 包括如下哪些协议?(多选)A.RIPB.BGPC.IS-ISD.EIGRPE.OSPFANSWER:A C D E17.RIP 协议引入路由保持机制的作用是?A.节省网络带宽B.防治网络中形成路由环路C.将路由不可达信息在全网扩散D.通知邻居路由器哪些路由是从其处得到ANSWER:B18.对路由理解正确的是?A.路由是路由器B.路由是信息在网络路径的交叉点C.路由是用以配置报文的目的地址D.路由就是指导报文发送的路径信息ANSWER:D19.路由协议RIP,OSPF和静态路由各自得到了条到达目标网络,在CISCO路由器默认情况下,最终选选定哪种路由作为最优路由?A.RIPB.OSPFC.静态路由ANSWER:C20.在RIP 协议中,计算metric 值的参数是?A.MTUB.时延C.带宽D.路由跳数ANSWER:D21.衡量路由算法好坏的原则不包括?A.快速收敛性B.灵活性,弹性C.拓扑结构先进D.选径是否是最佳ANSWER:C22.RIP 协议是基于?A.UDPB.TCPC.ICMPD.Raw IPANSWER:A23.禁止RIP 协议的路由聚合功能的命令是?A.no route ripB.summanyC.no auto summanyD.undo networkANSWER:C24.解决路由环路的方法有?(多选)A.水平分割B.抑制时间C.毒性逆转D.触发更新ANSWER:A B C D25.路由环问题会引起哪些问题?(多选)A.慢收敛B.广播风暴C.路由器重起D.路由不一致ANSWER:A D26.下列哪些路由协议存在路由自环问题?(多选)A.RIPB.IGRPC.OSPFD.IS-ISE.EIGRPANSWER:A B27.关于RIP V1 和RIP V2,下列说法哪些正确?(多选)A.RIP V1 报文支持子网掩码B.RIP V2 报文支持子网掩码C.RIP V2 缺省使用路由聚合功能D.RIP V1 只支持报文的简单口令认证,而RIP V2 支持MD5 认证ANSWER:B C28.在一个运行OSPF 的自治系统之内?(多选)A.骨干区域自身也必须连通的B.非骨干区域自身也必须连通的C.必须存在一个骨干区域(区域号为0)D.非骨干区域与骨干区域必须直接相连或逻辑上相连ANSWER:A C D29.以下关于Rip 路由聚合的说法正确的是?(多选)A.Rip V1 默认支持路由聚合,需要时可以关闭路由聚合功能B.华为Quidway 系列路由器Rip V2 的实现可以关闭路由聚合功能C.Rip V1 不支持子网路由聚合到一个非自然子网路由D.Rip V2 支持子网路由聚合到一个非自然子网路由ANSWER:B C D30.假设有这样的组网实例:两台路由器(假设为RTA 和RTB)通过串口相接,其中RTA 的串口IP 地址是,RTB 的串口IP 地址是,RTA 通过以太口连接的本地局域网的IP 地址是,RTB 通过以太口连接的本地局域网IP 地址是,在上面所有的接口上都启动RIP V1(仅仅RIP V1)协议,那么,下列说法正确的是?(多选)A.在RTA 的本地局域网上的计算机可以访问在RTB 本地局域网上的计算机B.在RTB 的本地局域网上的计算机可以访问在RTA 本地局域网上的计算机C.在RTA 的本地局域网上的计算机不能访问在RTB 本地局域网上的计算机D.在RTB 的本地局域网上的计算机不能访问在RTA 本地局域网上的计算机ANSWER:C D31.根据路由的目的地不同,路由表可被划分为?(多选)A.子网路由B.直连路由C.缺省路由D.主机路由E.静态路由ANSWER:A D32.对路由器A 配置RIP 协议,并在接口S0(IP 地址为路由协议,在全局配置模式下使用的第一条命令是?A.router ripwork allworkworkANSWER:A33.当接口运行在RIP-2 广播方式时,它可以接受的报文有?(多选)A.RIP-1 广播报文B.RIP-1 组播报文C.RIP-2 广播报文D.RIP-2 组播报文ANSWER:A C34.RIP 协议的路由项在多少时间内没有更新会变为不可达?A.90sB.120sC.180sD.240sANSWER:C35.VLSM 的含义是?A.Variable Length Subnet MaskingB.Variable Length Shortest MaskingC.Very Long/Shortest MaskingD.Variable Long Subnet MaskingE.Variable Length Short MeasurementANSWER:A36.距离矢量路由协议使用水平分割(split horizon)技术的目的是什么?(多选)A.避免在毗邻路由器之间产生路由环路B.确保路由更新数据报文沿着接收路线方向发送C.与保持间隔(holddown)机制协同工作,为保持间隔的计算提供更多的可靠性D.代替路由中毒(poison reverse)算法ANSWER:A C37.作为一个网络维护人员,对于OSPF 区域体系机构的原则必须有清楚地了解,下面的论述表达正确的是?(多选)A.所有的OSPF 区域必须通过边界路由器与区域0 相连,或采用OSPF 虚链路B.所有区域间通信必须通过骨干区域0,因此所有区域路由器必须包含到区域0 的路由C.单个区域不能包含没有物理链路的两个区域边界路由器D.虚链路可以穿越stub 区域ANSWER:A B38.支持可变长子网掩码的路由协议有?(多选)A.RIP v1B.RIP v2C.OSPFD.EIGRPANSWER:B C D39.因为在生成路由表的过程中,OSPF 协议需要进行复杂的SPF 算法来计算网络拓扑结构,所以相对距离矢量路由选择协议来说,它需要更大的开销,更多的延迟,更高的CPU 占用率。
思迅科技CCNA测试题
一.选择题(2分*20道)1.工作在OSI第三层的设备是:( )A:网卡 B:路由器 C: 交换机 D:集线器答案:B2.OSI第二层数据封装完成后的名称是:( )A:比特 B: 包 C:帧 D:段答案:C3.某网络中,拟设计10子网,每个子网中放有14台设备,用IP地址段为199.41.10.X ,请问符合此种规划的子网掩码是( )A: 255.255.255.0 B:255.255.240.0C: 255.255.255.240 D:255.248.0.0答案:C4.一个 C 类地址: 192.168.5.0 ,进行子网规划,要求每个子网有10 台主机,使用哪个子网掩码划分最合理()A. 使用子网掩码255.255.255.192 ;B. 使用子网掩码255.255.255.224 ;C. 使用子网掩码255.255.255.240 ;D. 使用子网掩码255.255.255.252 。
答案:C5. IP 地址:192.168.12.72 ,子网掩码为:255.255.255.192,该地址所在网段的网络地址和广播地址为()A. 192.168.12.32 , 192.168.12.127 ;B. 192.168.0.0 , 255.255.255.255C. 192.168.12.43 , 255.255.255.128 ;D. 192.168.12.64 , 192.168.12.127答案:D6.以下哪三个是将交换机的接口划分到vlan的原因?(选三个)A.允许更多的设备连接到网络B.为了ISC(服务器控制)C.在功能的基础上对主机进行逻辑上分组D.增强网络安全性答案:ACD7.对交换机的描述,正确的是()A:单广播域,单冲突域的设备B:单广播域,多冲突域的设备C:多广播域,单冲突域的设备D:多广播域,多冲突域的设备答案:B8.为了阻止交换机环路,交换机上所采用的技术为()A:水平分割B:生成树协议 C:触发更新 D:地址学习答案:B9.路由器上端口fa0/0,其最大传输速率是()Mbit/sA:128 B: 10 C:100 D: 1000答案:C10.Cisco交换机STP默认的模式是什么()A.PVSTB.PVST+C.PVRST+D.MST答案:B11.如下图示,利用STP的知识判断,当三台交换机的所有接口都no shutdown时,哪台设备的哪个接口将会被block?()A:SW1的f0/1 B:SW2的f0/2 C:SW1的f0/3 D:SW3的f0/3 答案:D12.为了禁止网络210.93.105.0 ftp到网络223.8.151.0,允许其他信息传输,则能实现该功能的选项是:( )多选A:access-list 1 deny 210.93.105.0.0.0.0.0.0B:access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftpC: access-list 100 deny tcp 210.93.105.0 255.255.255.0 223.8.151.0 255.255.255.0 eq ftpD:access-list 100 permit ip any any答案:BD13.下面有关NAT(A) NAT(B) NAT用来实现私有地址与公用网络地址之间的转换(C) 当内部网络的主机访问外部网络的时候,一定不需要NAT(D) 地址转换的提出为解决IP地址紧张的问题提供了一个有效途径答案:ABD14.默认情况下,RIP定期发送路由更新的时间是()A:15S B:30S C:60S D:180S答案:B15.某台PC,能ping通路由器,但不能telnet到路由器,可能的原因是()A:PC的IP地址设置错误 B:路由器端口IP设置错误C:路由器端口处于关闭状态 D:telnet密码未设置答案:D16.默认路由的作用是什么?(选一个)A.提供路由优于动态路由协议B.给本地网络服务器提供路由C.从ISP提供路由到一个末节网络D.提供路由到一个目的地,这个目的地在本地网络之外并且在路由表中没有它的明细路由答案:D17.关于IP()(A) 路由是OSI模型中第三层的概念(B)和下一跳(C) IP地址和MAC地址(D) IP路由是指导IP报文转发的路径信息答案:AD18.关于HUB以下说法正确的是()A、 HUB可以用来构建局域网B、一般HUB都具有路由功能C、 HUB(N AT)D、一台共享式以太网HUB下的所有PC属于同一个冲突域答案:AD19.哪种路由协议默认是用带宽和延迟作为度量值的?(选一个)A.RIPB.BGPC.OSPFD.EIGRP答案:D20.假设路由器路由表中到达同一网络有静态,RIP和OSPF路由,请问路由器转发到达该目的数据包使用什么协议?A.静态B.RIPC.OSPFD.三个都用答案:A二.填空题(3分*10道)1.RIPv1发送更新的地址是;RIPv2发送更新的地址是: EIGRP发送更新消息的地址是:OSPF中DR发送更新消息的地址是:2.请写出各网段私有IP:A:B:C:3.STP的PVST+模式中,BID包含的三个字段分别是:, ,4.VTP的三种模式分别是: , ,5.企业网的三层架构是: , ,6.请举例完成下列动态路由协议的分类(每一类至少列举一种网络协议)(1)按照工作区域区分:IGP(内部网关协议):EGP(外部网关协议):(2)按照有类无类区分有类别路由协议:无类别路由协议:(3)按照协议类型区分链路状态路由协议:距离矢量路由协议:7.EIGRP选择FS的条件是:8.EIGRP metric度量计算中K1 K2 K3 K4 K5分别代表:, , , ,9.查看路由条目时,只显示由OSPF学习到的路由条目的show命令是:10.EIGRP路由协议中FD是:AD是:答案:1.255.255.255.255 224.0.0.9 224.0.0.10 224.0.0.5 2.A:10.0.0.0--10.255.255.255B: 172.16.0.0--172.31.255.255C: 192.168.0.0--192.168.255.2553.桥优先级 VLAN-ID(system ID) MAC4.服务模式客户模式透明模式5.核心层汇聚层接入层6.(1)按照工作区域区分:IGP(内部网关协议): RIP OSPF EIGRPEGP(外部网关协议): BGP(2)按照有类无类区分有类别路由协议:RIPV1 IGRP无类别路由协议: RIPV2 OSPF EIGRP(3)按照协议类型区分链路状态路由协议: OSPF距离矢量路由协议:RIP7.FS的AD<后继的FD8.带宽负载延迟可靠性 MTU9.show ip route ospf10.可行距离通告距离二.简答题(10分*3道):1.简述R1,R2,R3学习其他两台设备的路由情况。
(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考试题
第一局部:选择题1:提供可靠数据传输、流控的是OSI的第几层〔〕A、表示层B、网络层C、传输层D、会话层E、链路层2:子网掩码产生在那一层〔〕A、表示层B、网络层C、传输层D、会话层3:当路由器接收的IP报文的目的地址不是本路由器的接口IP地址,并且在路由表中未找到匹配的路由项,采取的策略是〔〕A、丢掉该分组B、将该分组分片C、转发该分组D、以上答案均不对4:当一台主机从一个网络移到另一个网络时,以下说确的是〔〕A、必须改变它的IP地址和MAC地址B、必须改变它的IP地址,但不需改动MAC地址C、必须改变它的MAC地址,但不需改动IP地址D、MAC地址、IP地址都不需改动5:ISO提出OSI的关键是〔〕A、系统互联B、提高网络速度C、为计算机制定标准D、经济利益6:OSI参考模型按顺序有哪些层〔〕A、应用层、传输层、网络层、物理层B、应用层、表示层、会话层、网络层、传输层、数据链路层、物理层C、应用层、表示层、会话层、传输层、网络层、数据链路层、物理层D、应用层、会话层、传输层、物理层7:LAN的拓扑形式一般以〔〕为主。
A、总线型B、环型C、令牌环D、载波侦听与冲突检测CSMA/CD8:网段地址的网络,假设不做子网划分,能支持〔〕台主机A、254B、1024C、65,534D、16,777,2069:路由器网络层的根本功能是〔〕。
A、配置IP地址B、寻找路由和转发报文C、将MAC地址解释成IP地址10:选出基于TCP协议的应用程序〔〕。
A、PINGB、TFTPC、TELNETD、OSPF11:*公司申请到一个C类IP地址,但要连接6个的子公司,最大的一个子公司有26台计算机,每个子公司在一个网段中,则子网掩码应设为〔〕。
A、B、C、D、255.255.255.22412:B类地址的缺省掩码是〔〕。
A、B、C、13:在以太网中,是根据〔〕地址来区分不同的设备的。
A、IP地址B、IP*地址C、LLC地址D、MAC地址14:以下哪项是合法的IP主机地址?〔〕A、B、C、D、15:以下容哪些是路由信息中所不包含的〔〕。
版本ccna考试第一章期末考试答案b
PDU 封装的正确顺序是什么答案说明最高分值2correctness of response 2 points for Option 10 points for any other option此试题参考以下领域的内容:Introduction to Networks数据封装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correctness of response 2 points for Option 420 points for any other option此试题参考以下领域的内容:Introduction to Networks融合网络请参见图示。
哪个区域最有可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 320 points for any other option此试题参考以下领域的内容:Introduction to NetworksInternet主机正在访问远程网络的FTP 服务器。
中间网络设备在此对话中起到哪三个作用(请选择三项。
)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。
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。
CCNA第三学期官方章节考试题之五、《STP》》(附答案)46 doc
路由器只能防止第以太网协议没有交换机缺乏防止环路所需的成熟软件。
帧环路是以太网协议内建的可靠性机制。
2B每用作链路确定网络中每台交换机的指定端口使用拓扑变化通知和确认建议同意过程阻塞学习禁用侦听转发4在根交换机是具有最高速端口的交换机。
当两个端口开销相等时,有关阻塞哪个端口的决策取决于端口优先级和身份标识。
所有中继端口均为指定端口,不会被阻塞。
根交换机上的所有端口均被设置为根端口。
每台非根交换机仅拥有一个根端口。
5在具有一个生成树实例的已收敛的网络中,将存在哪两项要素?(选择两项。
)每个网络有一个根桥所有非指定端口转发每个非根桥有一个根端口每个网段有多个指定端口每个网络有一个指定端口6下列关于生成树的说法中哪两项正确?(选择两项。
)不运行生成树的交换机仍然会转发收到的BPDU。
任何一个VLAN 中的所有交换机必须运行某种形式的生成树。
PVST+ 模式是Cisco 版本的多生成树,可与多生成树模式互换使用。
创建VLAN 的同时也创建了快速PVST+ 的一个生成树实例。
快速生成树会逐条链路完成收敛。
7生成树拓扑收敛过程的第一步是什么?选举根桥确定每个网段的指定端口阻塞非指定端口选择指定中继端口激活每个网段的根端口8C1C1D1所有交换机C110交11为快速生成树协议定义了哪三种链路类型?(选择三项。
)共享端到端边缘型边界型点对多点对点12RSTP 边缘端口收到BPDU 时会进行哪两项操作?(选择两项。
)立即失去边缘状态防止产生TCN马上转换到学习状态禁用自身成为普通的生成树端口13当命令spanning-tree vlan 1的hello 时间和最大老化时间参数增大时会发生哪两个事件?(VLAN 1 具有更多BPDU 流量。
VLAN 1 收敛速度更快。
VLAN 1 的网络直径增大。
运行VLAN 1 的交换机的处理器占用减少。
VLAN 1 的优先级降低。
14下列关于RSTP 和STP 的说法中哪三项准确?(选择三项。
CCNA认证试题(中文+答案)
CCNA认证试题一(附答案和解析)中文版(一)1、目前,我国应用最为广泛的LAN标准是基于()的以太网标准.(A) IEEE 802。
1(B) IEEE 802。
2(C) IEEE 802.3(D)IEEE 802.5答案:C参考知识点:现有标准:IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802。
3 以太网IEEE 802.4 令牌总线IEEE 802。
5 令牌环IEEE 802.8 FDDIIEEE 802。
11 无线局域网记住IEEE802.1-——-—--IEEE802。
5的定义以太网是一种计算机局域网组网技术.IEEE制定的IEEE 802。
3标准给出了以太网的技术标准.它规定了包括物理层的连线、电信号和介质访问层协议的内容。
以太网是当前应用最普遍的局域网技术.它很大程度上取代了其他局域网标准,如令牌环、FDDI和ARCNET。
以太网的标准拓扑结构为总线型拓扑,但目前的快速以太网(100BASE—T、1000BASE-T标准)为了最大程度的减少冲突,最大程度的提高网络速度和使用效率,使用交换机(Switch)来进行网络连接和组织,这样,以太网的拓扑结构就成了星型,但在逻辑上,以太网仍然使用总线型拓扑的C***A/CD介质访问控制方法.电气电子工程师协会或IEEE(Institute of Electrical and Electronics Engineers)是一个国际性的电子技术与信息科学工程师的协会.建会于1963年1月1日。
总部在美国纽约市。
在150多个国家中它拥有300多个地方分会。
目前会员数是36万.专业上它有35个专业学会和两个联合会。
IEEE发表多种杂志,学报,书籍和每年组织300多次专业会议。
IEEE定义的标准在工业界有极大的影响.下面列出:IEEE802.3以太网标准802。
3--——---—— 10Base以太网标准802.3u-—------ 100Base-T(快速以太网)802.3z—-—————— 1000Base-X(光纤吉比特以太网)802.3ab———-——-— 1000Base—T(双绞线吉比特以太网)2、对于这样一个地址,192。
PT_练习8.6.1__CCNA_综合技巧练习(教师版)
PT 练习 8.6.1:CCNA 综合技巧练习(教师版)拓扑图所有内容版权所有 . 1992–2007 Cisco Systems, Inc. 保留所有权利。
本文档为 Cisco 公开信息。
第 1 页(共 31页)CCNA Exploration接入 WAN:网络故障排除 PT 练习 8.6.1:CCNA 综合技巧练习HQ 地址表设备接口 IP 地址子网掩码 DLCI 映射Fa0/0 10.0.1.1 255.255.255.0 不适用S0/0/0.41 10.255.255.1 255.255.255.252 DLCI 41 到 B1HQ S0/0/0.42 10.255.255.5 255.255.255.252 DLCI 42 到 B2S0/0/0.43 10.255.255.9 255.255.255.252 DLCI 43 到 B3S0/0/1 10.255.255.253 255.255.255.252 不适用S0/1/0 209.165.201.1 255.255.255.252 不适用分支路由器的地址表设备接口 IP 地址子网掩码Fa0/0.10 10.X.10.1 255.255.255.0Fa0/0.20 10.X.20.1 255.255.255.0Fa0/0.30 10.X.30.1 255.255.255.0Fa0/0.88 10.X.88.1 255.255.255.0BX Fa0/0.99 10.X.99.1 255.255.255.0S0/0/0 第二个地址 255.255.255.252BX-S1 VLAN 99 10.X.99.21 255.255.255.0BX-S2 VLAN 99 10.X.99.22 255.255.255.0BX-S3 VLAN 99 10.X.99.23 255.255.255.0BX-WRS VLAN 1 10.X.40.1 255.255.255.0.以分支路由器 B1、B2 或 B3 的编号代替”X”。
(完整版)CCNA-ITN-第-2-章考试
第2章 配置网络操作系统1 下列哪两项是闪存的特征?(请选择两项。
)闪存提供非易失性存储。
当设备启动时,闪存接收来自 RAM 的 IOS 副本。
重新启动时闪存中的内容可能会丢失。
闪存是思科交换机的组件,但不是思科路由器的组件。
闪存的内容可以被覆盖。
当设备启动时,闪存会保存 IOS ,并将 IOS 副本传输到 RAM 中。
尽管闪存可以升级和覆盖,但它是非易失性存储器。
设备重新启动或断开电源时,闪存内容仍会保留。
答案 说明 最高分值correctness of response Option 1 and Option 5 are correct.1 point for each correct option. 0 points if more options are selected than required.22 网络管理员计划在总部的几个路由器和交换机上升级 IOS 。
继续选择和升级 IOS 之前必须回答哪三个问题?(请选择三项。
)设备是否位于同一 LAN ?设备是否有足够的 NVRAM 来存储 IOS 映像?什么型号的路由器和交换机需要升级?路由器和交换机上安装了哪些端口?路由器和交换机是否有足够的 RAM 和闪存来用于提议的 IOS 版本?设备需要哪些功能?启动配置文件存储在 NVRAM 中,而不是 IOS 中。
升级到新 IOS 版本时应考虑的重要因素包括可用 RAM 和闪存数量、设备类型和型号以及所需功能。
答案 说明 最高分值correctness of response Option 3, Option 5, and Option 6 are correct.1 point for each correct option. 0 points if more options are selected than required.33 当在安全环境下执行初始配置时,下列哪个程序可用来访问 Cisco 2960 交换机?使用 Telnet 通过网络远程访问交换机。
CCNA期末考试题及答案试卷A(仅供参考)
1.下列有关网络层编址的陈述中哪三项是正确的?(选择三项。
)网络层编址使用分层式结构。
使用长度为48 位的地址。
以太网交换机可以使用它来作出转发决定。
它不支持广播。
其使用的编址方法可以识别地址的网络部分。
网络层编址可以区分每台主机。
2请参见图示。
网络中的所有设备均使用默认配置。
此拓扑中存在多少个广播域?3579113请参见图示。
主机B 已断电。
交换机的MAC 表将发生什么变化?MAC 表不会受影响。
交换机会在Fa0/19 上删除MAC 地址。
交换机会保留MAC 地址,直到主机B 再次通电。
交换机将通过为端口Fa0/19 分配地址FFF.FFFF.FFFF 来重建MAC表。
4.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5.哪三个地址属于私有IP 地址?(选择三项。
)10.0.0.1127.0.0.1150.0.0.1172.16.0.1192.168.0.1200.100.50.16请参见图示。
电缆1 和电缆2 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该网段中用来连接网络组件的电缆。
哪三个网段安装的电缆是正确的?(选择三项。
)网段1网段2网段3网段4网段5网段67.OSI 模型的哪两项功能在第2 层实现?(选择两项)物理编址编码路由布线介质访问控制8.请参见图示。
网络管理员想通过Modem1 从PC1 远程访问路由器的CLI。
要实现此访问,应将路由器的哪一个端口连接到Modem2?控制台端口以太网端口辅助端口串行端口9请参见图示。
某学生对5e 类电缆两端的接线方法如图所示。
结果是什么?(选择两项)电缆无法使用,必须重新接线。
该电缆适合作为全反电缆使用。
该电缆适合作为快速以太网交叉电缆使用。
该电缆适合作为千兆以太网直通电缆使用。
该电缆适合在支持Auto-MDIX 的两台100 Mbps 交换机之间使用。
ccna考试题库
c c n a考试题库(总34页) -CAL-FENGHAI.-(YICAI)-Company One1-CAL-本页仅作为文档封面,使用请直接删除QUESTION 37What are two characteristics of RIPv2 (Choose two.)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute path Answer: BDExplanation/Reference:A:有类路由协议,错误B:可变长度子网掩码,正确C:采用广播地址更新,错误D:手动路由汇总,正确E:使用spf算法计算路径,错误。
QUESTION 38Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A.1000BASE-CXB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXAnswer: CEExplanation/Reference:A:最长距离25米B:最长距离100米C:最长距离3000米D:最长距离550米E:最长距离70千米QUESTION 39What two things will a router do when running a distance vector routing protocol(Choose two.)A. Send periodic updates regardless oftopology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.Answer: ADExplanation/Reference:考点:考查距离矢量路由协议特性A:周期性更新,正确B:发送整个路由表到整个路由域,错误,只发送给邻居C:使用SPF算法,错误D:依靠邻居发送更新来更新路由表,正确E:在数据库中维护整个网络的拓扑。
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CCNA测试题1、Which of the following host addresses are members of networks that can be routed across the public Internet?(Choose three.)A. 10.172.13.65B. 172.16.223.125C. 172.64.12.29D. 192.168.23.252E. 198.234.12.95F. 212.193.48.2542、What is a global command?A. a command that is available in every release of IOS, regardless of the versionor deployment statusB. a command that can be entered in any configuration modeC. a command that is universal in application and supports all protocolsD. a command that is implemented in all foreign and domestic IOS versionsE. a command that is set once and affects the entire router3、All WAN links inside the ABC University network use PPP with CHAP for authentication security. Which command will display the CHAP authentication process as it occurs between two routers in the network?A. show CHAP authenticationB. show interface serial0C. debug PPP authenticationD. debug CHAP authenticationE. show ppp authentication chap4、The RIP network shown in the graphic has been fully operational for two days. Each routing table is complete.Which networks will be included in the next routing update from the Apples router to the Pears router?A. A,B,C,D,E,FB. A,CC. A,B,CD. B,DE. D,E,F5、How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?A. Configure a separate sub-interface for each PVC with a unique DLCI and subnetassigned to thesub-interface.B. Configure each Frame Relay circuit as a point-to-point line to support multicastand broadcast traffic.C. Configure many sub-interfaces on the same subnet.D. Configure a single sub-interface to establish multiple PVC connections tomultiple remoterouter interfaces.6、What three pieces of information can be used in an extended access list to filter traffic? (Choose three.)A. protocolB. VLAN numberC. TCP or UDP port numbersD. source switch port numberE. source IP address and destination IP addressF. source MAC address and destination MAC address7、Refer to the exhibit. A network technician enters the following lines into the router.What is the effect of this configuration?A. The change has no effect on the packets being filtered.B. All traffic from the 192.168.254.0 LAN to the Internet is permitted.C. Web pages from the Internet cannot be accessed by hosts in the 192.168.254.0 LAN.D. No hosts in the 192.168.254.0 LAN except 192.168.254.7 can access web pages from theInternet.8、Refer to the exhibit. The partial frame in the graphic represents select header information within a framearriving at a destination host. What can be determined from this information?A. The source host is a Telnet server.B. This frame contains the first segment in a Telnet session.C. The Layer 2 address of the source host is 192.168.14.2.D. The local host has received 42,335 bytes from the remote host as a part of thisconversation.9、Refer to the exhibit. The technician wants to upload a new IOS in the router while keeping the existing IOS.What is the maximum size of an IOS file that could be loaded if the original IOS is also kept in flash?A. 3 MBB. 4 MBC. 5 MBD. 7 MBE. 8 MB10、Refer to the exhibit. To what does the 128 refer in the router output O 192.168.12.240/30 [110/128] via 192.168.12.233,00:35:36, Serial 0?A. OSPF costB. OSPF priorityD. OSPF ID numberE. OSPF administrative distance11、Refer to the exhibit. Workstation A must be able to telnet to switch SW-A through router RTA for management purposes. What must be configured for this connection to be successful?A. VLAN 1 on RTAB. default gateway on SW-AC. IP routing on SW-AD. cross-over cable connecting SW-A and RTA12、Refer to the exhibit. A technician is testing connection problems in the internetwork. What is the problem indicated by the output from HostA?A. The routing on Router2 is not functioning properly.B. An access list is applied to an interface of Router3.C. The Fa0/24 interface of Switch1 is down.D. The gateway address of HostA is incorrect or not configured.13、A network administrator needs to force a high-performance switch that is located in the MDF to become the root bridge for a redundant path switched network. What can be done to ensure that this switch assumes the role as root bridge?A. Establish a direct link from the switch to all other switches in the network.B. Assign the switch a higher MAC address than the other switches in the networkhave.C. Configure the switch so that it has a lower priority than other switches in thenetwork.D. Configure the switch for full-duplex operation and configure the other switchesfor half-duplex operation.E. Connect the switch directly to the MDF router, which will force the switch toassume the role of root bridge.14、Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.)A. Router(config)# router ospf 0B. Router(config)# router ospf 1C. Router(config)# router ospf area 0D. Router(config-router)# network 192.168.16.0 0.0.0.255 0E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 015、Refer to graphic and examine the output from the London switch . What VTP functions will this switch perform?A. create, change, and delete VLANs for the VTP domainB. learn and save VTP configuration information in the running configuration onlyC. forward VTP configuration informationD. backup the VTP database for the closest VTP serverE. prevent VTP information from reaching workgroup switches16、Which wild card mask will enable a network administrator to permit access to the Internet for only hosts that are assigned an address in the range of 192.168.8.0 through 192.168.15.255?A. 0.0.0.0C. 0.0.255.255D. 0.0.7.255E. 0.0.3.25517、Refer to the exhibit. Based on the exhibited routing table, how will packets from a host within the 192.168.10.192/26 LAN be forwarded to 192.168.10.1?A. The router will forward packets from R3 to R2 to R1.B. The router will forward packets from R3 to R1 to R2.C. The router will forward packets from R3 to R2 to R1 AND from R3 to R1.D. The router will forward packets from R3 to R1.18、Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? (Choose three.)A. Switch A - Fa0/0B. Switch A - Fa0/1C. Switch B - Fa0/019、Refer to the exhibit. Switch1 sends a VTP advertisement and Switch2 receives it. Which statement accurately describes how Switch2 will process this advertisement?A. Switch2 will ignore the summary advertisement.B. Switch2 will delete all its VLANs because it has a lower revision number thanSwitch1.C. Switch2 will increment the VTP revision number and forward the advertisement.D. Switch2 will create two new VLANs in response to the information contained in theadvertisement20、Refer to the exhibit. Host A needs to send data to Host B. Which Layer 2 and Layer 3 destination addresses will be used to send the data from Host A to Host B?A. 192.168.60.5 and 0011.43da.2c98B. 192.168.60.5 and 0007.0e56.ab2eC. 192.168.24.1 and 0007.0e56.ab2eD. 192.168.24.2 and 0007.0e84.acef21、Why has the network shown in the exhibit failed to converge?A. The no auto-summary command needs to be applied to the routers.B. The network numbers have not been properly configured on the routers.C. The subnet masks for the network numbers have not been properly configured.D. The autonomous system number has not been properly configured.E. The bandwidth values have not been properly configured on the serial interfaces22、Refer to the exhibit. After the power-on self test (POST), the system LED ofa Cisco 2950 switch turns amber.What is the status of the switch?A. The POST was successful.B. The switch has a problem with the internal power supply and needs an externalpower supply to be attached.C. POST failed and there is a problem that prevents the operating system of the switchfrom being loaded.D. The switch has experienced an internal problem but data can still be forwardedat a slower rate.E. The switch passed POST, but all the switch ports are busy.23、Refer to the exhibit. All switch ports are assigned to the correct VLANs, but none of the hosts connected to SwitchA can communicate with hosts in the same VLAN connected to SwitchB. Based on the output shown, what is the most likely problem?A. The access link needs to be configured in multiple VLANs.B. The link between the switches is configured in the wrong VLAN.C. The link between the switches needs to be configured as a trunk.D. VTP is not configured to carry VLAN information between the switches.E. Switch IP addresses must be configured in order for traffic to be forwarded betweenthe switches24、Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity?A. A loopback is not set.B. The IP address is incorrect.C. The subnet mask is incorrect.D. The serial line encapsulations are incompatible.E. The maximum transmission unit (MTU) size is too large.F. The bandwidth setting is incompatible with the connected interface.。