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1、2022思科认证考试试题及答案7章2022思科认证考试试题及答案7章 第1章 Which of the following are VLAN frame. encapsulation types that may be configured on a Catalyst switch? (Choose two.)A. VTPB. ISLC. CDPD. 802.1QE. 802.1pF. LLC正确答案：BDB,D 解析：Explanation:The two VLAN trunking encapsulation types are:Inter-Switch Link (ISL): This
2、is proprietary to Cisco switches, and its used for Fast Ethernet and Gigabit Ethernet links only. ISL routing can be used on a switch port, router interfaces, and server interface cards to trunk a server. ISL lets you explicitly tag VLAN information onto an Ethernet frame. This tagging information a
3、llows VLANs to be multiplexed over a trunk link through an external encapsulation method, which allows the switch to identify the VLAN membership of a frame. over the trunked link. IEEE 802.1Q: Created by the IEEE as a standard method of frame. tagging, this actually inserts a field into the frame.
4、to identify the VLAN. If youre trunking between a Cisco switched link and a different brand of switch, you have to use 802.1Q for the trunk to work. OSI七层模型中，“包”是哪一层数据封装的名称（）A.物理层B.数据链路层C.网络层D.传输层正确答案：C 以下ACL将对路由器的流量产生何种影响（）A.它将允许所有源自192.168.19.0的网络流量B.它将拒绝源自主机192.168.19.162的流量C.因为通配符掩码忽略了所有比特，所以对流量
5、没有影响D.permitany选项使deny选项失效正确答案：B 以下特殊区域中哪一个没有自动下发缺省路由（）A.末梢区域B.完全末梢区域C.NSSA区域D.完全NSSA区域正确答案：D在BPDU中,sysidext字段长多少位?()A.4位B.8位C.12位D.16位答案：C2022思科认证考试试题及答案7章 第2章 You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of t
6、he following network masks should you use?A225.225.224.0.B225.225.240.0.C225.225.255.0.D255.255.255.224E225.225.255.240正确答案：D解析：Explanation:ThedefaultsubnetmaskforclassCnetworkis255.255.255.0.Ifonehastocreate5subnets,then3bitsarerequired.With3bitswecancreate8subnets.Theremaining5bitsareusedforHosts.
7、Onecancreate30hostsusing5bitsinhostfield.Thismatcheswiththerequirement.IncorrectAnswers:A,B:ThisisanillegalsubnetmaskforaclassCnetwork,asthethirdoctetcannotbedividedwhenusingaclassCnetwork.C:ThisisthedefaultsubnetmaskforaclassCnetwork.Itprovidesforonenetwork,with254usablehostIPaddresses.E:Thissubnet
8、maskwillprovidefor14separatenetworkswith14hostseach.Thisdoesnotmeettherequirementofaminimumof18hosts. The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during th
9、e test? (Choose two)AARPBCDPCDHCPDDNSEICMP正确答案：AE解析：Explanation:ARPfindsthehardwareaddressofahostfromaknownIPaddress.Hereshowitworks:whenIPhasadatagramtosend,itmustinform.aNetworkAccessprotocol,suchasEthernetorTokenRing,ofthedestinationshardwareaddressonthelocalnetwork.(Ithasalreadybeeninformedbyupp
10、er-layerprotocolsofthedestinationsIPaddress.)IfIPdoesntfindthedestinationhostshardwareaddressintheARPcache,itusesARPtofindthisinformation.ICMPworksattheNetworklayerandisusedbyIPformanydifferentservices.ICMPisamanagementprotocolandmessagingserviceproviderforIP.ItsmessagesarecarriedasIPdatagrams.RFC12
11、56isanannextoICMP,whichaffordshostsextendedcapabilityindiscoveringroutestogateways.Periodically,routeradvertisementsareannouncedoverthenetwork,reportingIPaddressesfortheroutersnetworkinterfaces.Hostslistenforthesenetworkinfomercialstoacquirerouteinformation.Aroutersolicitationisarequestforimmediatea
12、dvertisementsandmaybesentbyahostwhenitstartsup. The Ezonexam network administrator wants to use a router named VE1 to segment the local network. What are some of the advantages of using VE1 to segment the network? (Choose two)A. Routers generally cost less than switchesB. Filtering can occur based o
13、n Layer 3 informationC. Broadcasts are not forwarded across the routerD. Broadcasts are eliminatedE. Adding a router to the network decreases latencyF. Routers can generally support more LAN ports than switches正确答案：BCB,C 在使用链路状态路由的网络中，由网络变更触发的更新可以加速收敛过程。此题为判断题(对，错)。正确答案： 一个AS由多个组织行政下控制的网络组成。此题为判断题(对
14、，错)。正确答案：2022思科认证考试试题及答案7章 第3章 下列关于stub区域的描述，哪些是正确的（ ）A.stub区域是一种可选必选的配置属性，所有的每个区域都可配置B.stub区域是指那些不传播Type5（即引入的外部路由器）的LSA的区域C.该区域的ABR生成一条缺省路由（0.0.0.0）传播到区域内D.stub区域通常位于自治系统边界，是那些只有一个ABR的非骨干区域正确答案：BC 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.255.255.255.0B.255.255.240.0C.255.255.
15、255.240D.255.248.0.0正确答案：C 以下哪项是距离矢量的特点之一（）A.它们不会计数到无穷大B.可以工作在大型网络中C.不会引起路由环路D.算法简单正确答案：D RIP路由在()时间内没有收到更新会删除不可达路由()A.90sB.120sC.180sD.240s正确答案：D Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)A. In
16、spect the routing table to select the best path to the destination network addresses.B. Validate sources of routing information.C. Inspect the ARP table to verify a legitimate source MAC address for each packet.D. Identify the destination network address of each packet.E. Verify the receipt of route
17、d packets by the next hop router.F. Identify the source network address of each packet.正确答案：ADA,D 解析：Explanation:The router decides how to forward an incoming packet by finding the routes that match the destination address of the packet, and then forwarding it according to the most narrowly applicab
18、le one. A packet matches a route in the following way: a packet has (among other things) a destination address in its header, a route contains either a network or a host address, a network mask (netmask), and instructions on how to forward a packet using the route. The packet matches the route if it
19、s destination address is part of the address subspace defined by the network address or exactly matches the host address of the route. A route is more narrowly applicable than another if the address subspace defined by its network address contains fewer actual addresses than the other, which is indi
20、cated by the netmask. An entry with a host address, rather than a network address, is the narrowest kind.2022思科认证考试试题及答案7章 第4章 为查看控制器状态，你需要输入哪个命令?（）A.show running-configB.show startup-configC.show versionD.show controllers正确答案：D 命令ip nat pool aaa 192.1.1.2 192.1.1.10 netmask 255.255.255.0的作用是()A.指定可
21、访问地址B.定义地址池C.指定路由D.定义哪些地址可以进行地址转换正确答案：B 查看E0端口配置信息的命令是：()A.show access-listB.show ip routeC.show versionD.show interfacee0正确答案：D A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses
22、 from connecting to the network through a switch?A. BPDUB. Port securityC. RSTPD. STPE. VTPF. Blocking mode正确答案：BB 解析：Explanation:Understanding How Port Security Works:You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the MAC address of the station
23、 attempting to access the port is different from any of the MAC addresses specified for that port. Alternatively, you can use port security to filter traffic destined to or received from a specific host based on the host MAC address.When a secure port receives a packet, the source MAC address of the
24、 packet is compared to the list of secure source addresses that were manually configured or autoconfigured (learned) on the port. If a MAC address of a device attached to the port differs from the list of secure addresses, the port either shuts down permanently (default mode), shuts down for the tim
25、e you have specified, or drops incoming packets from the insecure host.The ports behavior. depends on how you configure it to respond to a security violation. If a security violation occurs, the Link LED for that port turns orange, and a link-down trap is sent to the Simple Network Management Protoc
26、ol (SNMP) manager. An SNMP trap is not sent if you configure the port for restrictive violation mode. A trap is sent only if you configure the port to shut down during a security violation. 下列哪个network命令会告知此路由器开始使用IP地址为10.1.1.1、10.1.100.1和10.1.120.1的接口上的OSPF（）A.network 10.0.0.0 255.0.0.0 area 0B.net
27、work 10.0.0.0 0.255.255.255 area 0C.network 10.0.0.1 0.0.0.255 area 0D.network 10.0.0.1 0.0.255.255 area 0正确答案：B2022思科认证考试试题及答案7章 第5章STP定义了哪些端口角色?()A.阻断端口B.丢弃端口C.根端口D.非指定端口E.转发端口F.指定端口答案：ACDEF 下列静态路由配置正确的是()A.iproute 192.168.1.1 255.255.255.0 serial0/0B.iproute 192.168.1.0/24 172.16.1.1C.iproute 192
28、.168.1.0 255.255.255.0172.16.1.0D.iproute 192.168.1.0 255.255.255.0172.16.1.1正确答案：D While troubleshooting a network connectivity problem, a Ezonexam technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping co
29、mmand is issued from the workstation, the output message Request timed out. is displayed. At which layer of the 7-layer OSI model does the problem most likely exist?A. The data link layerB. The application layerC. The protocol layerD. The access layerE. The session layerF. The network layerG. None o
30、f the above正确答案：FF 查看路由表的命令是：()A.show interfaceB.show runC.show ip routeD.show table正确答案：C 在大型网络中选择OSPF而不选择RIP的原因是（）A.更快的路由收敛B.需要更少的路由器内存C.需要更少的CPU的资源D.更优的选路，路由无环路正确答案：AD2022思科认证考试试题及答案7章 第6章 哪个命令用来设置Cisco设备串行接口的默认封装()A.Router(config)encapsulation hdlcB.Router(config)encapsulation default hdlcC.Rout
31、er(config-if)encapsulation hdlcD.Router(config-if)encapsulation ppp正确答案：C You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into router VE1 locally using a terminal emulation program such as HyperTerminal.A. Connect the PCs COM port to the routers c
32、onsole port using a straight-through cable.B. Connect the PCs COM port to the routers console port using a rollover cable.C. Connect the PCs COM port to the routers Ethernet port using a straight-through cable.D. Connect the PCs Ethernet port to the routers Ethernet port using a rollover cable.E. Co
33、nnect the PCs Ethernet port to the routers Ethernet port using a straight- through cable.F. None of the above正确答案：BB 解析：Explanation:To connect the Router in Console port to configure using HyperTerminal, you required the Rollover Cable, which connects the PCs COM port to the routers Console port.Inc
34、orrect Answers:A, C, E: Straight Cables are used for: Host to switch, Switch to Router.D: Rollover cables are used for Console/COM connections, not for IP traffic over theEthernet ports. In a switched LAN network, what is the Spanning-Tree algorithm used for?A. It is used to provide a mechanism for
35、routing updates in switched environments.B. It is used to prevent routing loops in networks with redundant routes.C. It is used to prevent switching loops in networks with redundant switched routes.D. It is used to manage, the addition, deletion, and naming of VLANs across multiple switches.E. It is
36、 used to segment a network into multiple collision domains.F. None of the above.G. All of the above are functions of STP.正确答案：CC 解析：Explanation:To avoid loops, all bridging devices, including switches, use STP. STP causes each interface on a bridging device to settle into a blocking state or a forwa
37、rding state. Blocking means that the interface cannot forward or receive data frames. Forwarding means that the interface can send and receive data frames. By having a correct subset of the interfaces blocked, a single currently active logical path will exist between each pair of LANs. STP resides a
38、t the data link layer, so it is used to prevent loops within a switched network. It is not used to prevent routing loops; that is the function of the mechanisms within a routing protocol. 子网172.16.0.0/22有（）个可用的IP地址A.1022B.1024C.256D.254正确答案：A A new Ezonexam switch is installed into an existing LAN a
39、nd a new VTP trunk is set up with an existing switch. Which VLANs will be allowed on this new trunk?AAll defined VLANs are allowed on the trunk by default.BEach VLAN, or VLAN range, that is specified with the switchport mode command.CEach VLAN, or VLAN range, that is specified with the vtp domain co
40、mmand.DEach VLAN, or VLAN range, that is specified with the vlan database command.ENone of the above正确答案：A解析：Explanation:The question does not state that there are multiple VTP Domains meaning that all defined VLANs are allowed on the trunk until a vtp domain command is issued.2022思科认证考试试题及答案7章 第7章
41、You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?A225.225.224.0.B225.225.240.0.C225.225.255.0.D255.255.255.224E225.225.255.240正确答案：D解析：Explanation:Thedefaultsubnetmaskf
42、orclassCnetworkis255.255.255.0.Ifonehastocreate5subnets,then3bitsarerequired.With3bitswecancreate8subnets.Theremaining5bitsareusedforHosts.Onecancreate30hostsusing5bitsinhostfield.Thismatcheswiththerequirement.IncorrectAnswers:A,B:ThisisanillegalsubnetmaskforaclassCnetwork,asthethirdoctetcannotbediv
43、idedwhenusingaclassCnetwork.C:ThisisthedefaultsubnetmaskforaclassCnetwork.Itprovidesforonenetwork,with254usablehostIPaddresses.E:Thissubnetmaskwillprovidefor14separatenetworkswith14hostseach.Thisdoesnotmeettherequirementofaminimumof18hosts. 下列命令中，无法正确执行的是（）A.Router(config)show runB.Routerping 127.0.
44、0.1C.Router(config)hostname ciscoD.Routerreload正确答案：A What will cause a Ezonexam router to enter setup mode? (Choose two)A. The configuration file is missing in NVRAM.B. The configuration register is set to 0x2100.C. Boot system commands are misconfigured in the running-configuration.D. The setup co
45、mmand was issued from the privileged mode prompt.E. The IOS is missing.F. The IOS is corrupt.正确答案：ADA,D 解析：Explanation:When router boots up, it checks the valid configuration into NVRAM and tries to load the configuration. If there is not configuration router automatically goes into setup dialog. From setup dialog, you able to configuration the basic configuration. As well you can run the setup command manually from privileged mode using the setup command. 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D.静态路由正确答案：A 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.被承载网络层协议D.动态路由协议正确答案：D