ccnp.642-902.题库v200完美修正版完美版

1、Exam AQUESTION 1Refer to the exhibit. Which sement is true? Select the best response.A.B.C.D.Router RAR1 will accept only route 10.10.0.0/19 from its BGRouter RAR1 will send only route 10.10.0.0/19 to its BOnly traffic widestination from 10.10.0.0/19 will bOnly traffic going to 10.10.0.0/19 will be

2、permittedAnswer: ASection: RedistribuzioneExplanation/Reference:考点：policydistribuist用distribuist对从bgp邻居过来路由表项进滤。，在策略中in 影响本地路由器out 影响邻居路由器图中控制列表中反演匹配号和子网掩码，注意0是精确匹配，1是任意匹配，224就是3位，也就是19位，所以QUESTION 2Refer to the exhibit. map? (Choose thre Select 3 response(nts accuray describe the result of applying

3、 the exhibited routeA.B.C.The map prohibits the redistribution of all type 2 external OSPF routes with tag 6 set.The map prohibits the redistribution of all type 2 external OSPF routes.The map redistributeso EIGRP all routest match the pfx prefix list and the five metric values40000, 1000, 255, 1, a

4、nd 1500.D.E.F.The map prohibits the redistribution of all external OSPF routes with tag 6 set.All routest do no match clauses 10 and 20 of the route map are redistributed with their tags set to 8.The map permits the redistribution of all type 1 external OSPF routes.Answer: AEFSection: Redistribuzion

5、eExplanation/Reference:考点：policyroute-map用route-map对从ospf重分布进来的路由表项进行过滤。同一个route-map子项中多个match是与的关系，而不同route-map子项间是或的关系。过滤掉了type-2，那么就剩下type-1能过。图中的路由打上Tag 8标记有tag6，E2类型的OSPF重分发；允许所有的E1类型路由；把其他未过滤掉QUESTION 3Refer to the exhibit. EIGRP has been configured on all routershe network. What additional co

6、nfigurationsement should be included on router R4 to advertise a default route to its neighbors?Select the best response.A.B.C.D.R4(config)# ip default-network 10.0.0.0 R4(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1R4(config)# ip route 10.0.0.0 255.0.0.0 10.1.1.1R4(config-router)# default-information

7、 originateAnswer: ASection: EIGRPExplanation/Reference:考点：EIGRPEIGRP在默认路由是使用ip default-network 10.0.0.0QUESTION 4o which two types of areas would an area border router (ABR) inject a default route? (Choose two.) Select 2 response(s).A.B.C.D.E.F.the autonomous system of a differenteri area 0totally s

8、tubby NSSAstubateway protocol (IGP)the autonomous system of an exteriateway protocol (EGP)Answer: CESection: OSPFExplanation/Reference:考点：OSPF的特殊区域哪两种类型区域让ABR一条默认路由，当然是stub区域和totally stubby区域。注意NSSA区域中默认路由的路由器既是ABR，又是ASBR。QUESTION 5Which three restrictions apply to OSPF stub areas? (Choose three.) S

9、elect 3 response(s).A.B.C.No virtual links are allowed.The area cannot be a backbone area.Redistribution is not allowed unless the packet is changed to a type 7 packet.D.E.F.The area has no moren 10 routers.No autonomous system border routers are allowed.erarea routes are suppressed.Answer: ABESecti

10、on: OSPFExplanation/Reference:考点：OSPF的特殊区域因为OSPF的末节区域只连接一个区域，所以它是不可能成为骨干区域和建立虚电路的。ASBR只能出现在特殊区域NSSA中，不能出现在stub area，原因是stub area不能引入外部路由。QUESTION 6What are the two reasons for the appearance of 0.0.0.0 as the next hop for a network d output? (Choose two.)Select 2 response(s).he show ip bgpA.B.C.D.E.

11、The network was originated via redistribution of anThe network was defined by a sic route.eriateway protocolo BGP.The network was originated via a network or aggregate The network was learned via EBGP.The network was learned via IBGP.d.Answer: ACSection: BGPExplanation/Reference:考点：BGP用show ip bgp命令

12、发现路由下一条地址为0.0.0.0，这说明这条路由是它自己产生的。在BGP中，自己产生路由的方式有重分发，使用network命令，使用聚合aggregate命令。QUESTION 7Refer to the exhibit. Which two sements are true about the partial configuration two.)t is provided. (ChooseSelect 2 response(s).A.B.C.D.All the configured neighbors are in autonomous system 100. The peer grou

13、p shortens the IBGP configuration.The peer group shortens the EBGP configuration.Only the outgoing filters are app d to BGP updates.E. Three AS-path filters are app d to each BGP neighbor.Answer: ABSection: BGPExplanation/Reference:考点：BGP图中定义了一个 ernal，即IBGP对等体组，并且将整个对等体组定义为AS 100。并将171.69.232.52/54/

14、55三个路由器加入对等体组中。QUESTION 8Refer to the exhibit. Which two sements are correct? (Choose two.) Select 2 response(s).A.B.C.D.E.All six routes will be installed Two routes will be installedFour routes will be installedhe routing table. he routing table.he routing table.All the routes were redistributedo

15、BGP from an IGP.All the routes were originated by BGP with the networkd.Answer: CDSection: BGPExplanation/Reference:考点：BGP best 表示是最优路径，所以有4条路由加入路由表中？plete 表示从IGP重分布到EGP中的路由，所以是六条E选项：如果用network命令 最后path值应该显示为iQUESTION 9What are two rules for compacting IPv6 addresses? (Choose two.) Select 2 response

16、(s).A.Theis two.um number of times a double colon can replace a 16-bit segmentt consists of all zeroesB.C.D.E.The leading zeroes in any 16-bit segment do nove to be written.Every 16-bit segmentt consists of all zeroes can be represented wisingle colon.The trailing zeroes in any 16-bit segment do nov

17、e to be written.Any single, continuous string of one or more 16-bit segmentst consists of all zeroes can berepresented wiTwo zeroesdouble colon.he middle of any 16-bit segment do noF.ve to be written.Answer: BESection: IPv6Explanation/Reference:考点：ipv6的缩写这道题考的是ipv6定义：每个16位组开始的0可以省略任意多个为0的16位组可以用:表示，

18、但是一个ipv6的地址中只允许出现一次:QUESTION 10What is the difference betn the IPv6 addresses :/0 and :/128? Select the best response.A.B.C.D.E.F.:/0 is the unspecified address, and :/128 is the multicast address.:/0 is the unicast address, and :/128 is the anycast address.:/0 is the unicast address, and :/128 is t

19、he multicast address.:/0 is the anycast address, and :/128 is the multicast address.:/0 is the default route, and :/128 is the unspecified address.:/0 is the anycast address, and :/128 is the default address.Answer: ESection: IPv6Explanation/Reference:考点：ipv6（特殊的ipv6地址）书中定义的 :/0表示默认路由 :/128表示非特定地址QU

20、ESTION 11Refer to the output. What IOSd produthis output? Select the best response.A.B.C.D.show ishow ipfpferfaceerfaceshow ipv6 ospfshow ipv6 ospfAnswer: DSection: IPv6Explanation/Reference:考点：ipv6ospfv3是专门为ipv6设计的，然后第一行又是出现的进程信息，所以是命令是show ipv6 ospf大家可以敲一遍命令研究研究。，首行是进程信息QUESTION 12Refer to the exh

21、ibit. Router RTA is the hub router for routers RTB and RTC. The Frame Relay network is configured with EIGRP, and the entire network is in autonomous system 1. However, router RTB and RTC are not receiving each others routes. What is the solution? Select the best response.A.B.C.Configure the auto su

22、mmaryd under router eigrp 1 on router RTA.d on router RTA.Ie the no ip split horizonConfigure suberfa suberface.on the spoke routers and assign different IP addresbnets for eachD.E.F.Check and change the acs lists on router RTA.Ie the no ip split horizon eigrp 1d on router RTA.hat allows it to adver

23、tise all routes to the spoke routers.Configure a distribuist on router RAnswer: ESection: EIGRPExplanation/Reference:考点：EIGRP在帧中继中实现frame relay是一个多路复用技术，图中RTB将自己的路由给路由器RTA的 s0/0口，因为水平分割的原因，RTA不会将RTB的路由再从s 0/0出去，这样RTC将不会得到RTB的路由，所以只要关闭RTA水平分割，路由才会接收正常。图中的拓扑是一个hub and spoke 结构，然后上面运行的是EIGRP协议。注意在星型结构中

24、，边缘路由器会因为水平分割而导致边缘路由器之间得不到互相的路由更新。水平分割：在一个接口上得到的路由更新不会从这个接口再出去。QUESTION 13A router has two paths to reach another network in a different autonomous system. Neither route was generated by the local router and both routes have the same default weight and local preference values. Which sement is true a

25、bout how BGP would select the best path?Select the best response.A.If thehighest MED.d bgppare-med has been given, then the router will prefer the route with theB.C.D.The router will prefer the route with the lower MED.The router will prefer the shortest autonomous system path.To influence one route

26、 to be preferred, its default local preference value will be changed via the use ofthed bgp default local-preference 50.Answer: CSection: BGPExplanation/Reference:考点：BGP的选路策略即是一个更新通过多个BGP对等体学到的时候，它的选路策略问题。BGP选路原则：权本始，短起M权:weight本:local-pref ,默认为100始：自己通告的，即next-hop为0.0.0.0短：最短as-path起：Origin, 优先级：ie

27、? M: MED，最小MED，11步：lowest RID为 etric如题干描述所示both routes have the same default weight and local preference values： weight和local pre的值都相等QUESTION 14Refer to the exhibit. On the basis of the information two.)he exhibit, which two sements are true? (ChooseSelect 2 response(s).A.B.C.D.E.The output was gen

28、erated by entering the show ip bgpThe output was generated by entering the show ip bgpd on the ISP router.d on the SanJose1 router.The serial 0/0/1The serial 0/0/1erface on the ISP router has been configured with the set metric 50erface on the ISP router has been configured with the set metric 75d.d

29、.When traffic is sent from the ISP to autonomous system 64512, the traffic will be forwarded to SanJose1 because of the lower MED value of SanJose1.When traffic is sent from the ISP to autonomous system 64512, the traffic will be forwarded to SanJose2 because of the higher MED value of SanJose2.F.An

30、swer: AESection: RedistribuzioneExplanation/Reference:考点：BGPMED值因为网段192.168.100.0的下一条跳0.0.0.0，这代表192.168.100.0这条路由是本地产生的，而这条路由是ISP router的直连路由，所以上图是ISP上运行的show ip bgp产生的，A正确。根据BGP路由选路原理，其他路由器过来的路由所带的MED越低，此路由器就会选择该路由，E正确。除了MED，其他的属性都一样QUESTION 15Refer to the exhibit. On the basis of the configuratio

31、nt is provided, how would the BGP updatestcome from router R1 be replicated inside autonomous system 65200?Select the best response.A.All BGP updatest are received on router R2 will be sent to routers R3 and R4. Routers R3 and R4will then forward those BGP updates to router R5.B.C.D.All BGP updatesA

32、ll BGP updatest are received on router R2 will not be sent to routers R3 and R4.t are received on router R2 will be sent directly to router R5.None of the BGP updatest are received on router R2 will ever be received by router R5.Answer: DSection: BGPExplanation/Reference:考点：BGP因为R2没有与R5建立BGP对等体关系，所以

33、R2不会与R5发生TCP互，D正确。，即R2，R5之间没有BGP更新交QUESTION 16How is authentication handled with OSPFv3? Select the best response.A.B.C.D.OSPFv3 for IPv6 authentication i OSPFv3 for IPv6 authentication i OSPFv3 for IPv6 authentication iOSPFv3 for IPv6 authentication ipported by SHA-1 authentication. pported by MD5

34、authentication. pported by IPv6 IPsec.pported by IPv4 IPsec.Answer: CSection: IPv6Explanation/Reference:考点：ipv6OSPFv3的认证方式OSPFv3的包头没有authentication type和key字段，它是通过IPv6 IPsec来实现认证的，IPv6 IPsec更安全。QUESTION 17Refer to the exhibit. Router RT-1 chooses one path to network 198.133.219.0/24. Indicate the re

35、ason Router RT-1 chooses this best path.Select the best response.A.B.C.D.E.F.aking its deciaking its deciabout the best path, RT-1 gives precedence to the origin code.about the best path, RT-1 gives precedence to the BGP MED values.IP address 128.107.2.2 is lowern 128.107.255.2.aking its deciabout t

36、he best path, RT-1 prefers the IGP metrics.RT-1 prefersernal BGP routes.IP address 128.107.254.2 is lowern 128.107.255.2.Answer: ASection: BGPExplanation/Reference:考点：BGP的选路策略选路过程（按比较的先后顺序）：1. Weight (Bigger is better)2. Local preference (Bigger is better) 3. Selforiginated (Locally injected is bett

37、ern iBGP/eBGP learned) 4. AS-Path (Smaller is better) 5. Origin(Prefer ORIGIN code I over E, and E over ?)6. MED (Smaller is better)QUESTION 18Refer to the exhibit. Router RT-1 and router RT-2 bodvertise network 131.25.0.0/16 to router RT-3 viaernal BGP. What is the reasont router RT-3 chose router

38、RT-1 as its best path to network131.25.0.0/16.Select the best response.A.B.C.D.E.F.It advertises the best AS-path.It advertises the best origin code. It advertises the best MED.It advertises the best local preference.Is a better router ID.It advertises a lower autonomous system.Answer: ESection: BGP

39、Explanation/Reference:考点：BGP的选路策略 BGP选路原则：权本始，短起M权:weight本:local-pref ,默认为100始：自己通告的，即next-hop为0.0.0.0短：最短as-path起：Origin, 优先级：ie? M: MED，最小MED，11步：lowest RID为 etric注意描述：165.2.2.2 165.1.1.1QUESTION 19Using the rules for IPv6 addressing, how can the address 2031:0000:240F:0000:0000:09C0:123A:121B be

40、rewritten? Select the best response.A.B.C.D.2031:0:240F:09C0:123A:121B2031:240F:09C0:123A:121B2031:240F:9C0:123A:121B2031:240F:09C0:123A:121BAnswer: ASection: IPv6Explanation/Reference:考点：ipv6的缩写 这道题考的是定义：1.每个16位组开始的0可以省略2.任意多个为0的16位组可以用:表示，但是一个ipv6的地址中只允许出现一次:QUESTION 20What two situations could re

41、quire the use of multiple routing protocols? (Choose two) Select 2 response(s).A.B.C.D.E.F.when using UNIX host-based routerswhen smaller broadcasts are desiredbecause having multiple routing protocols confuses hackerswhen migrating from an oldereriateway Protocol (IGP) to a new IGPwhen all equipmen

42、t is manufactured by Ciscowhen there are multiple paths to destination networksAnswer: ADSection: RoutingExplanation/Reference:考点：多路由协议的运用这题属于定义，A、D正确。使用UNIX主机作为路由器；做旧的IGP协议向新的IGP协议的迁移。QUESTION 21During BGP configuration on a routers peered with other BGP speakers, the BGPdaggregate-address 172.32.0

43、.0 255.255.252.0 is ied. However, the peers do not receive this aggregatenetwork in BGP advertisements. Also, the router does nove this aggregate network in its BGP table.Which option indicates asible reason thisd did not cause the router to advertise the aggregatenetwork to its peers? Select the be

44、st response.A.B.C.D.E.F.erface NULL 0 is likely shutdown.The BGPThe BGPd no synchronization is missing.d no auto-summary is missing.Subnets of 172.32.0.0/22 do not exist The IGP running on this router does noThe next hop IP address must be a lohe BGP table.ve network 172.32.0.0/22 installed. ack add

45、ress.Answer: DSection: BGPExplanation/Reference:考点：BGP路由聚合aggregate命令在BGP中，用aggregate命令做路由聚合时，明细子网必须有一条是up的，否则命令是不起作用的。QUESTION 22Refer to the partial configurations Router1?he exhibit. What address is utilized for DR and BDR identification onSelectthe best response.A.B.C.D.the serial 1/1 address th

46、e serial 2/0 addressa randomly generatedernal addressthe configured router-id addressAnswer: DSection: OSPFExplanation/Reference:考点：ipv6OSPFv3是使用ipv4的地址作为RID，在配置OSPFv3必须要指定他的RID，所以DR和BDR的标识符是使用手动指定的ipv4地址作为RID。QUESTION 23Refer to the exhibit. What is required to complete the IPv6 routing configurati

47、ons shown? Select the best response.A.B.C.D.erface authentication must be configured.The routing proses must be configured win area ID.IP unicast routing must be enabled.IPv4 addresses must be app d to theerfa.Answer: CSection: IPv6Explanation/Reference:考点：ipv6图中就差ipv6 unicast routing必须开启，即是全局启用ipv6

48、路由QUESTION 24Refer to the exhibit. Routers R1 and R2 have been configured to operate with OSPF. Routers R1 and R3have been configured to operate with RIP. After configuring the redistribution betn OSPF and RIP onR1, no OSPF routes are distributedo RIP. What should be done to correct this problem?Sel

49、ect the best response.A.B.C.D.The redistribution The redistributionThe redistributiond should be reentered with the match route-type parameter included.d should be reentered with the route-map map-tag parameter included. d should be reentered with the metric metric-value parameter included.Routes wi

50、llneed to be distributedo anothrotocol, and theno RIP.Answer: CSection: RedistribuzioneExplanation/Reference:考点：路由的重分布当OSPF路由重分布进入RIP的时候，必须手动配置Metric，因为重分布时默认的Metric是无穷大，因此路由不会选入路由表中。所以要重新输入Metric字段。QUESTION 25Which two routing protocols require a metric to be configured when redistributing routes f

51、rom other protocols? (Choose two.)Select 2 response(s).A.B.C.D.E.RIP OSPF EIGRP IS-ISBGPAnswer: ACSection: RoutingExplanation/Reference:考点：路由的重分布当其他协议的路由重分布进入RIP和EIGRP的时候，必须手动配置Metric，因为重分布时默认的Metric是无穷大，因此路由不会选入路由表中。所以要重新输入Metric字段。QUESTION 26By default, which sement is correct regarding the redist

52、ribution of routes from other routing protocols OSPF?Select the best response.oA.B.C.D.E.They will appearThey will appearhe OSPF routing table as type E1 routes.he OSPF routing table as type E2 routes.Summarized routes are not accepted.All imported routes will be automatically summarized whensible.O

53、nly routes with lower administrative distanwill be imported.Answer: BSection: OSPFExplanation/Reference:考点：路由的重分布基本定义，其他协议的路由重分布进入OSPF中，会默认显示为type E2路由。QUESTION 27When implementing OSPFv3, which sement describes the configuration of OSPF areas? Select the best response.A.B.Inerface configuration mod

54、e, the OSPFv3 area ID combinatioto OSPFv3 areas.orks to OSPFv3In router configuration mode, the network wildcard area ID comb areas.onC.Inerface configuration mode, the IPv6 OSPF pros arassignserfatoOSPFv3 areas.D.In router configuration mode, the IPv6 OSPFer OSPFv3 on assignserfatoAnswer: CSection:

55、 IPv6Explanation/Reference:考点：ipv6基本定义，OSPFv3区域和进程置是在接口模式下进行的。QUESTION 28Refer to the exhibit.neighbor relationship betn routers R1 and R4. BGPpackets bet failover?n thh R2 or R3. What is the simplest configurationt will allow forSelect the best resnseA.B.C.D.Configure BGP neighbor relationships bet

56、n allerfaon R1 and R4.Install a direct connection betn R1 and R4.Configure loackerfaon R1 and R4 to provide the update source address for BGP packets.Configure only one neighbor relationship betn R1s 192.168.1.2erface and R4s172.16.10.2erface.Answer: CSection: BGPExplanation/Reference:考点：BGP图中是一个IBG

57、P的对等体，如果用回环口做IBGP对等体邻居关系的连接，当物理接口down掉了，通过IBGP对链路的重新收敛，可以保证BGP会话的稳定。题干中 failover-备份QUESTION 29Refer to the exhibit. Routing updates for the 192.168.1.0 network are being received from all three neighbors. Which sement is correct regarding the result of the configuration shown?Select the best respons

58、e.A.B.C.D.E.The router will prefer the next hop of 172.16.1.1 for packets destined for the 192.168.1.0 network. The router will prefer the next hop of 172.26.1.1 for packets destined for the 192.168.1.0 network. The router will advertise the 192.168.1.0 network only to 172.30.1.1.The router will adv

59、ertise the 192.168.1.0 network only to 172.26.1.1.The router will prefer the next hop of 172.26.1.1 for packets except those destined for theAnswer: BSection: BGPExplanation/Reference:考点：BGP选路问题，把来自192.168.1.0/24的前缀给他一个200的本地优先级，因为优先级高了，所以路由就会优先选择去往目的地192.168.1.0/24的下一条为172.26.1.1192.168.1.0对邻居172.2

60、6.1.1过来的路由表项做一个进站的更新。QUESTION 30When troubleshooting an EIGRP connectivity problem, you noticet two connected EIGRP routers arenoting EIGRP neighbors. Abetn the two routers wacsful. What is the next thingt should be checked? Select the best response.A.B.VerifyVerifyt the EIGRPo and hold timers match