单选题Router R1 sits inside OSPF area 1. Router R2 redistributes an E1 route into OSPF for prefix 2.2.2.0/24, with external metric 20. Router R22 redistributes an E2 route for the same prefix/length, external metric 10. Under what conditions will R1 choose as it s best route the route through R22?（）AR1 will always choose the route through R22.BAs long as R1's best internal OSPF cost to reach R22 is less than 10.CAs long as R1's best internal OSPF cost to reach R22 is less than 20.DR1 will never choo se the route through R22 if the E1 route through R2 is available.
单选题
Router R1 sits inside OSPF area 1. Router R2 redistributes an E1 route into OSPF for prefix 2.2.2.0/24, with external metric 20. Router R22 redistributes an E2 route for the same prefix/length, external metric 10. Under what conditions will R1 choose as it s best route the route through R22?（）
A
R1 will always choose the route through R22.
B
As long as R1's best internal OSPF cost to reach R22 is less than 10.
C
As long as R1's best internal OSPF cost to reach R22 is less than 20.
D
R1 will never choo se the route through R22 if the E1 route through R2 is available.
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阅读以下说明，回答问题1和问题2，将解答填入答题纸对应的解答栏内。 【说明】 某公司有3个分支机构，网络拓扑结构及地址分配如图4-1所示。【问题1】（每空1分，共11分） 公司申请到202.111.1.0/29的公有地址段，采用NAPT技术实现公司内部访问互联网的要求，其中，192.168.16.0/22网段禁止访问互联网。 R1、R2和R3的基本配置已正确配置完成，其中R1的配置如下。请根据拓扑结构，完成下列配置代码。 R1的基本配置及NAPT配置如下： R1enable Rlconfig tenrunal R1(config)interface fastenthemet 0/0 R1(config-if)ip address 192.168.0.1 255.255.255.252 R1(config-if)no shutdown Rl(config-if)exit R1(config)interface fastenthemet 0/1 R1(config-if)ip address 192.168.0.9 255.255.255.252 R1(config-if)no shutdown R1(config-if)exit R1(config)interface fastenthernet 0/2 R1(config-if)ip address （1） 255.255.252.0 //使用网段中最后一个地址 R1(config-if)no shutdown R1(config-if)exit R1(config)interface serial 0 R1(config-if)ip address 202.111.1.1 255.255.255.248 R1(config-if)no shutdown R1(corffig)ip nat pool ss 202.111.1.1 （2） netmask （3） R1(corffig) interface （4） fastenthernet 0/0-1 R1(config-if)ip nat （5） R1(config-if)interface serial 0 Rl(config-if)ip nat （6） R1(config-if)exit R1(config)access-Iist l permit 192.168.0.0 （7） Rl(config)ip nat inside （8） list （9） pool （10） （11） 【问题2】．（每空2分，共4分） 在R1、R2和R3之间运行OSPF路由协议，其中R1、R2和R3的配置如下。 行号 配置代码 1 R1(config)router ospf 1 2 R1(config-router)network 192.168.4.0 0.0.3.255 area 0 3 Rl(config-router)network 192.168.0.0 0.0.0.3 area 0 4 Rl(config-router)network 192.168.0.8 0.0.0.3 area 0 5 R2enable 6 R2config terminal 7 R2(config)router ospf 2 8 R2(config-router)netvrork 192.168.8.0 0.0.3.255 area 0 9 R2 (config-router)network 192.168.12.0 0.0.3.255 area 0 1 0 R2 (config-router)network 192.168.0.4 00.0.3 area 0 1 1 R3enable 1 2 R3config terminal 1 3 R3(config)router ospf 3 1 4 R3(config-router)netvrork 192168.0.8 00.0.3 area 0 1 5 R3(config-router)network 192.168.0.4 0.0.0.3 area 0 1．配置完成后，在R1和R2上均无法ping通R3的局域网，可能的原因是（12）。 （12）备选答案： A．在R3上未宣告局域网路由 B．以上配置中第7行和第13行配置错误 C．第1行配置错误 D．R1、R2未宣告直连路由． 2．在OSPF中重分布默认路由的命令是：（13）。 （13）备选答案： A．Rldefault-informaton originate B．R1(config-if)default-information originate C．R1(config-router)default-information originate D．Rl(config)default-information originate
The following output exists on Router R1, a router internal to area 1. What can you d etermine as true from the output of the show ip ospf database summary command?() A. The LSA was created by an ABR due to an area range command.B. The LSA was created by an ASBR due to a summary - address command.C. If cr eated by an area range command, the best metric for a subordinate subnet on that ABR must have been 11.D. None of the other answers is correct.
Refer to the exhibit. Routers R1 and R2 have established a neighbor relationship and are exchanging routing information. The network design requires that R1 r eceive routing updates from R2, but not advertise any routes to R2. Which configuration command sequence will successfully accomplish this task? （）A. R1(config)# router eigrp 1 R1(config - router)# passive - interface serial 0B. R1(config)# access - list 2 0 deny any R1(config)# router eigrp 1 R1(config - router)# distribute - list 20 out serial 0C. R2(config)# access - list 20 permit any R2(config)# router eigrp 1 R2(config - router)# distribute - list 20 in serial 0D. R1(config)# access - list 20 permit any R 1(config)# router eigrp 1 R1(config - router)# distribute - list 20 in serial 0E. R2(config)# access - list 20 deny any R2(config)# router eigrp 1 R2(config - router)# distribute - list 20 out serial 0F. R2(config)# router eigrp 1 R2(config - router)# passive - interface serial 0
Refer to the exhibit. OSPF has been configured on all routers in the network. However, router R1 does not receive a default route to router R2 as in tended. Which configuration change would ensure that R1 would receive a default route from R2? （）A. Add the area 1 stub command on routers R1.B. Add the always keyword to the default - information originate configuration command on router R2.C. Remov e the default information originate configuration command from router R2 and place it on router R1.D. Add the ip route 5.0.0.0 255.255.255.0 0.0.0.0 command to router R2.
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Refer to the diagram. Which OSPF configuration command is required to configure Area 3 a s atotally stubby area?() A. On the ABR router ospf 10 area 3 stubB. On all Area 3 routers router ospf 10 area 3 stubC. On all Area 3 routers router ospf 10 area 3 stub no - summaryD. On the ABR router ospf 10 area 3 nssaE. On the ABR rou ter ospf 10 area 3 stub no - summary
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?() A.Router(config)#router ospf 1B.Router(config)#router ospf 0C.Router(config)#router ospf area 0D.Router(config-router)#network 192.168.16.0 0.0.0.255 area 0E.Router(config-router)#network 192.168.16.0 0.0.0.255 0F.Router(config-router)#network 192.168.16.0 255.255.255.0 area 0
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Which of the following answers can be verified as true based on the following command output from Router R1?（） R1#show ip ospf virtual - links Virtual Link OSPF_VL0 to router 4.4.4.4 is up Run as demand circuit DoNotAge LSA alloweD. Transit area 1, via interface FastEthernet0/1, Cost of using 3A、R1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.B、The ping 4.4.4.4 command on R1 must currently be successful.C、R1's Fa0/0 OSPF cost is 3.D、4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
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Which of the following OSPF commands, when used together, will put the network 192.168.10.0/24 into OSPF area 0?（）A、Router(config-router)# network 192.168.10.0 0.0.0.255 0B、Router(config-router)# network 192.168.10.0 0.0.0.255 area 0C、Router(config-router)# network 192.168.10.0 255.255.255.0 area 0D、Router(config)# router ospf 0E、Router(config)# router ospf 1
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什么命令序列将配置一个路由器运行OSPF，并添加网络10.1.1.0/24 area0？（）A、router ospf area 0 network 10.1.1.0 255.255.255.0 area 0B、router ospf network 10.1.1.0 0.0.0.255C、router ospf 1 network 10.1.1.0 0.0.0.255 area 0D、router ospf area 0 network 10.1.1.0 0.0.0.255 area 0E、router ospf network 10.1.1.0 255.255.255.0 area 0F、router ospf 1 network 10.1.1.0 0.0.0.255
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多选题Which commands are required to properly configure a router to properly configure a router to run OSPFand to add network 192.168.16.0/24 to OSPF area 0？（）ARouter（config）#router ospf 1BRouter（config）#router ospf 0CRouter（config）#router ospf area 0DRouter（config-router）#network 192.168.16.0 0.0.0.255 area 0ERouter（config-router）#network 192.168.16.0 0.0.0.255 0FRouter（config-router）#network 192.168.16.0 255.255.255.0 area 0
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