Esun-CCNA内部考试题.pdf

1)Which of the following host addresses are members of networks that can be routed across thepublic Internet?(Choose three.)A.10.172.13.65B.172.16.223.125C.172.64.12.29D.192.168.23.252E.198.234.12.95F.212.193.48.254Answer:CEF保留地址和环回测试地址不能被路由到公网。保留地址：10.0.0.0-10.255.255.255172.16.0.0-172.31.255.255192.168.0.0-192.168.255.255环回测试地址：127.0.0.02)Which command is required for connectivity in a Frame Relay network if Inverse ARP is notoperational?A.frame-relay arpB.frame-relay mapC.frame-relay interface-dlciD.frame-relay Imi-typeAnswer:B如果逆向arp不能被使用，那么只能手动映射了frame-relay map3)After the show ip route command has been entered,the following routes are displayed.Whichroute will not be entered into the routing table of a neighboring router?A.R 192.168.8.0/241120/1 via 192.168.2.2,00:00:10,SerialOB.R 192.168.11.0/24 120/7 via 192.168.9.1,00:00:03,Serial 1C.C 192.168.1.0/24 is directly connected,EthernetOD.R 192.168.5.0/24 120/16 via 192.168.2.2,00:00:10,SerialOAnswer:D由 120可以判断出是r ip,而 ripl6跳就不可达了，所以不会有D 选项出现。4)It has become necessary to configure an existing serial interface to accept a second FrameRelay virtual circuit.Which of the following procedures are required to accomplish this task?(Choose three.)A.Remove the IP address from the physical interface.B.Encapsulate the physical interface with multipoint PPP.C.Create the virtual interfaces with the interface command.D.Configure each subinterface with its own IP address.E.Disable split horizon to prevent routing loops between the subinterface networks.F.Configure static Frame Relay map entries for each subinterface network.Answer:ACD考核配置帧中继子接口的命令1,移除物理接口的IP地址2,3,配置子接口在子接口上配置ip地址5)The RIP network shown in the graphic has been fully operational for two days.Each routingtable is complete.Which networks will be included in the next routing update from the Applesrouter to the Pears router?A.A,B,C,D,E,FB.A,CC.A,B,C,DD.B,DE.D,E,FF.A,B,CAnswer:F基本的路山概念，只能通告ABC网段。6)A Cisco router that was providing Frame Relay connectivity at a remote site was replaced witha differentvendor*s frame relay router.Connectivity is now down between the central and remote site.Whatis the mostlikely cause of the problem?A.mismatched LMI typesB.incorrect DLCIC.mismatched encapsulation typesD.inconect IP address mappingAnswer:C我们在配置frame-relay的时候，一般都默认打encapsulation frame-relay这个指令，其实这个默认封装的是cisco,还有另外一个选项时ietf,当两边都是思科设备的时候，那么用默认的封装是可以的，但是与其他厂商互联的时候，就得用encapsulation frame-relay ietf 了。所以，本题目答案是c,不匹配的封装类型7)Given the partial outputs displayed in the graphic,which switch device would be the spanningtree root bridge for a network of only these four devices?Tamp a#show spanning-treeSpanning tree 1 is executing the IEEE compatible Spanning Tree protocolBridge Identifier has priority 32768,address 0002.fd29.c505Configured 岳 11。time 2,max age 20,forward delay 15Miami#show spanning-treeSpanning tree 1 is executing the IEEE compatible Spanning Tree protocolBridge Identifier has priority 16384,address 0002.fd29,c504Configured hsllo time 2,max age 20,forward delay 15London#show spanning-treeSpanning tree 1 is executing the IEEE compatible Spanning Tree protocolBridge Identifier has priority 8192,address 0002.fd29,c503Configured hsllo time 2,max age 20,forward delay 15Cairo#show spanning-treeSpanning tree 1 is executing the IEEE compatible Spanning Tree protocolBridge Identifier has priority 4096,address 0002.fd29,c502Configured hsllo time 2,max age 20,forward delay 15A.TampaB.MiamiC.LondonD.CairoAnswer:D根桥的选举主要是看桥的i d,而桥的id 山两部分构成，优先级+m ac地址。先比较优先级，哪个值最小，哪个就最优先8)On three different occasions an administrator configured a router,and after testing theconfiguration saved it to NVRAM by issuing the copy running-config startup-config command.After each successful save the administrator issued the reload command.Each time when therouter restarted,the router appeared to have the default blank configuration.What could causesuch results?A.The boot system commands were left out of the configuration.B.The NVRAM is corrupted.C.The configuration register setting is incorrect.D.The upgraded IOS just loaded is not compatible with the hardware.E.The upgraded configuration is not compatible with the hardware platform.Answer:C配置寄存器应该配置了 0X 2142,造成启动后没有加载初始配置。改成0X2102就行了。9)If an ethernet port on a router was assigned an IP address of 172.16.112.1/20,what is themaximum number of hosts allowed on this subnet?A.1024B.2046C.4094D.4096E.8190Answer:C32-20=12,那么拥有的主机数目就是，2 的 12次方2=409410)Which commands are required to properly configure a router to run OSPF and to add network192.168.16.0/24 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 0Answer:BE配置o sp f,发布路山应该使用反掩码(wildcard mask)11)ABC Company is merging with several local businesses that use routers from multiple vendors.Which routing protocol would work best to connect ABC Company with the enterprise networks ithas acquired by providing scalability and VLSM support while minimizing network overhead?A.RIPvlB.RIPv2C.IGRPD.OSPFE.EIGRPAnswer:D连接多个厂商，eigrp肯定不行了；支持vlsm,rip vl igrp也不行；最小化网络的负载，rip v2每隔30秒钟要发一次路由更新，对网络的负载很大。所以，只有选择ospf 了。12)Which destination addresses will be used by Host A to send data to Host C?(Choose two.)Host CEmaHServerHost A Host BA.the IP address of Switch 1B.the MAC address of Switch 1C.the IP address of Host CD.the MAC address of Host CE.the IP address of the routers EO interfaceF.the MAC address of the routers EO interfaceAnswer:CFip地址越过路由器时候不改变；而 mac地址越过路由器的时候改变。13)In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?A.255.255.255.0B.255.255.255.240C.255.255.255.248D.255.255.255.252E.255.255.255.254Answer:D最节省的地址分配方法就是，255.255.255.252.这样除了网络地址和广播地址之后，就剩下两个地址了，刚好够用。14)To configure the VLAN trunking protocol to communicate VLAN information between twoswitches,what two requirements must be met?(Choose two.)A.Each end of the trunk line must be set to IEEE 802.IE encapsulation.B.The VTP management domain name of both switches must be set the same.C.All ports on both the switches must be set as access ports.D.One of the two switches must be configured as a VTP server.E.A rollover cable is required to connect the two switches together.F.A router must be used to forward VTP traffic between VLANs.Answer:BD要使vtp可以正常的工作l.vtp的域名要一致2.至少台是server,否则没有意义3.trunk当然要正常工作15)Which of the following commands will configure a default route to any destination networknot found in therouting table?A.Router(config)#ip default-route 0.0.0.0 255.255.255.255 sOB.Router(config)#ip route 0.0.0.0 255.255.255.255 sOC.Router(config)#ip default-route 0.0.0.0 sOD.Router(config)#ip route 0.0.0.0 0.0.0.0 sOE.Router(config)#ip route any any eOAnswer:D默认路山就是这个格式，其他的都不对16)Refer to the output of the corporate router routing table shown in the graphic.The corporaterouter receives an IP packet with a source IP address of 192.168.214.20 and a destination addressof 192.168.22.3.What will the router do with this packet?Corp#$how ip route Gateway of last resort is not setC 192.168.13.0/24 is directly connected.Serial0/1C 192.168.14.0/24 is directly connected,FastEthernetO/OC 192.168.15.0/24 is directly comiected.Serial0/0.102C 192.168.20.0/24 is directly connected.SenalO/0.117R 192.168.16.0/？4 120/1 via 192.168.1*2 00:00:05.Serial0/0.102R 192.168.17.0/24 120/1 via 192.168.15.2.00:00:05,Serial0/0.102R 192.168.30.0/24 120/2 via 192.168.20.2.00:00:25.Serial0/0.117R 192.168.19.0/24 120/1 via 192.168.20.2.00:00:25,Serial0/0.117R 192.168.21.0/24 120/3 via 192.168.20.2.00:00:25.Serial0/0.117R 192.168.214.0/24 120/1 via 192.168.14.2.00:00:22.FastEthernetO/OA.It will encapsulate the packet as Frame Relay and forward it out interface Serial 0/0.117.B.It will discard the packet and send an ICMP Destination Unreachable message out interfaceFastEthernet 0/0.C.It will forward the packet out interface Serial 0/l and send an ICMP Echo Reply message outinterface serial 0/0.102.D.It will change the IP packet to an ARP frame and forward it out FastEthernet 0/0.Answer:B题目问收到这样的ip包怎样处理？首先看路由表里面有没有这条路由，如果有就转发，如果没有就丢弃注意：只看目的网段192.168.22.0这个网段，没有路由，所以discard17)What is the default administrative distance of the OSPF routing protocol?A.90B.100C.110D.120E.130F.170Answer:C考察管理距离：ospf 110,rip 12018)After the router interfaces shown in the diagram have been configured,it is discovered thathosts in the Branch LAN cannot access the Internet.Further testing reveals additional connectivityissues.What will fix this problem?192.168.10.82/3062.18.12.5/30192.168.10.85/30A.Change the address of the Branch router LAN interface.B.Change the address of the Branch router WAN interface.C.Change the subnet mask of the HQ router LAN interface.D.Change the address of the HQ router LAN interface.E.Change the address of the HQ router interface to the Internet.F.Change the subnet mask of the HQ router interface to the Internet.Answer:BBranch和 HQ互联的接口不在一 个网段一个 192.168.10.80/30一个 192.168.10.84/30This graphic shows the results of an attempt to open a Telnet connection to router ACCESS 1 fromrouter Remote27.Which of the following command sequences will correct this problem?Remote27#Remote27#telnet accesslTrying ACCESS1(10.0.0.1).OpenPassword required,but none setConnection to accessl closed by foreign hostRemote27#A.ACCESS 1 (config)#line console 0ACCESS 1 (config-line)#password ciscoB.Remote27(config)#line console 0Remote27(config-line)#loginRemote27(config-line)#password ciscoC.ACCESS 1 (config)#line vty 0 4ACCESS 1 (config-line)#loginACCESS 1 (config-line)#password ciscoD.Remote27(config)#line vty 0 4Remote27(config-line)#loginRemote27(config-line)#password ciscoE.ACCESS 1 (config)#enable password ciscoF.Rcmote27(config)#enable password ciscoAnswer:CTelnet的密码没有设置。19)Refer to the diagram.Which three statements describe the router port configuration and theswitch port configuration as shown in the topology?(Choose three.)A.The Routeri WAN port is configured as a trunking port.B.The Routeri port connected to Switch 1 is configured using subinterfaces.C.The Routeri port connected to Switch 1 is configured as 10 Mbps.D.The Switch 1 port connected to Routeri is configured as a trunking port.E.The Switch 1 port connected to Host B is configured as an access port.F.The Switch 1 port connected to Hubl is configured as full duplex.Answer:BDE和电脑连接的交换机端口设成access,和路由器连接的交换机端口要起tru n k,让不同的VLAN通过，路由器上则要设成子接口对应每个VLAN。另，传统意义上讲，Hub是半双工的。20)The network administrator wants to upgrade the IOS of a router.The new image requires 64MB of RAM and 16 MB for storage of the file.Given the output shown in the graphic,which ofthe following is true?System image file is Mflash:c26OO-ik8o3s-mz.l22-8.T5.binMCisco 2620(MPC860)processor(revision 0 x200)with 16384/2048K bytes of memory.Processor board ID JAD05076EF6M 960 processor:part num ber 0,mask 49Bridging software.一X.25 software,Version 3.0.01 FastEthernet/IEEE 802.3 interface(s)2 Low-speed serial(synch/asynch)network interface(s)32K bytes of non-volatile configuration memory.16384K bytes of processor board System flash(Read/Write)Configurotion register is 0 x 21 02A.This router meets the requirements for the new image.B.This router will require a DRAM upgrade to meet the requirements for the new image.C.This router will require a flash upgrade to meet the requirements for the new image.D.This router will require an NVRAM upgrade to meet the requirements for the new image.Answer:B题目是说需要64M 内存和16M的 F lash,而路由器上只有16M内存，所以要升级内存。21)An access list was written with the four statements shown in the graphic.Which single accesslist statement will combine all four of these statements into a single statement that will haveexactly the same effect?-1-1-1sssss1111rr-fr-mn ln lmrrrreeeepppp000511111111ssss.14.1i222277771111ooovrooooo.wo.doooo.16,17,.184.99992222A.access-list 10 permit 172.29.16.0 0.0.0.255B.access-list 10 permit 172.29.16.0 0.0.1.255C.access-list 10 permit 172.29.16.0 0.0.3.255D.access-list 10 permit 172.29.16.0 0.0.15.255E.access-list 10 permit 172.29.0.0 0.0.255.255Answer:C先进行进制转换16=1000017=1000118=1001019=10001只有后面两位可以变化，所以结果就是：172.29.16.0 0.0.3.25522)The show interfaces serial 0/0 command resulted in the output shown in the graphic.What arepossible causes for this interface status?(Choose three.)Router#show interfaces serial 0/0Serial0/0 is up,line protocol is downHardware is HD64570Internet address is 192.168.100.1/24MTU 1500 bytes,BW 1544 Kbit,DLY 20000 usee,reUability 255/255,txload 1/255,rdoad 1/255Encapsulation HDLC,loopback not setKeepalive set(10 sec)A.The interface is shut down.B.No keepalive messages are received.C.The clockrate is not set.D.No loopback address is set.E.No cable is attached to the interface.F.There is a mismatch in the encapsulation type.Answer:BCF端口是up 的，所以排除A 和 E。D 是乱说在以太网中，如果一定时间内收不到keepalive信息，那么就会产生line protocl down的情况。clockrate是时钟速率，不设置它，两边也无法通信。在实验环境中会比较多碰到这种情况。如果两边封装类型不匹配，line protocol也会d o w n,比如在frame-relay中。23)Which of the following describe private IP addresses?(Choose two.)A.addresses chosen by a company to communicate with the InternetB.addresses that cannot be routed through the public InternetC.addresses that can be routed through the public InternetD.a scheme to conserve public addressesE.addresses licensed to enterprises or ISPs by an Internet registry organizationAnswer:BD私网IP不能被路山到公网，私网地址是为了节约公网地址。24)Refer to the topology and partial switch command output shown in the graphic.Theinternetwork shown in the diagram is experiencing connectivity problems.Host A is unable toping Host B.What needs to be done to enable these hosts to ping each another?Host AAddress-10.1.1.11Mask-255.255.255.0Gateway-10.1.1.254Host BAddress-10.1.2.3Mask-255.255.255.0Gateway-10.1.2.254ET-1#show vlanVLAN NamedefaultVLAN0002StatusPortsactiveactiveFa0/1,Fa0/2,FaO/3,FaO/4,FaO/5,FaO/6,Fa0/7,Fa0/8,FaO/9Fa0/10,Fa0/11,Gi0/1FaO/12A.The gateway on Host A needs to be changed.B.The IP address on Host B needs to be reconfigured.C.VLAN 2 must be named.D.The FaO/1 interface on the ET-1 switch must be configured as a trunk port.E.Switch port Fa0/l must be moved to a different VLAN.Answer:DFa0/l应该被配置成TRUNK.如果一个接口被配置成TRUNK,那么是不在任何VLAN中显示的，他在这里出现，就表示他是在VLAN1中，没有被配置成TRUNK。25)Refer to the graphic.A company wants to use NAT in the network shown.Which commandswill apply the NAT configuration to the proper interfaces?(Choose two.)A.RI(config)#interface serialO/1R1 (config-if)#ip nat insideB.RI(config)#interface serialO/1R l(config-if)#ip nat outsideC.RI(config)#interface fastethernetO/ORl(config-if)#ip nat insideD.RI(config)#interface fastethernetO/ORl(config-iO#ip nat outsideE.RI(config)#interface serialO/1Rl(config-if)#ip nat outside source pool 200.2.2.18 255.255.255.252F.R1 (config)#interface fastethernetO/ORl(config-if)#ip nat inside source 10.10.0.0 255.255.255.0Answer:BC进来的接口用ip nat