R1 is internal to area 1, and R2 is internal to area 2. Subnet 10.1.1.0/24 exists in area 2 as a connected subnet off R2. ABR ABR1 connects area 1 to backbone area 0, and ABR2 c onnects area 0 to area 2. Which of the following LSAs must R1 use when calculating R1's best route for 10.1.1.0/24?（）A、R2's Type 1 LSAB、Subnet 10.1.1.0/24's Type 2 LSAC、ABR1's Type 1 LSA in area 0D、Subnet 10.1.1.0/24's Type 3 LSA in Area 0E、 Subnet 10.1.1.0/24's Type 3 LSA in Area 1
R1 is internal to area 1, and R2 is internal to area 2. Subnet 10.1.1.0/24 exists in area 2 as a connected subnet off R2. ABR ABR1 connects area 1 to backbone area 0, and ABR2 c onnects area 0 to area 2. Which of the following LSAs must R1 use when calculating R1's best route for 10.1.1.0/24?（）
- A、R2's Type 1 LSA
- B、Subnet 10.1.1.0/24's Type 2 LSA
- C、ABR1's Type 1 LSA in area 0
- D、Subnet 10.1.1.0/24's Type 3 LSA in Area 0
- E、 Subnet 10.1.1.0/24's Type 3 LSA in Area 1
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【问题2】（6 分）根据网络拓扑和需求说明，完成路由器R1的配置。R1(config)# interface Serial 1/0R1(config-if)# ip address （3） 255.255.255.0 （设置串口地址）R1(config-if)#no shutdown （开启串口）R1(config)#interface FastEthernet0/0R1(config-if)#ip address （4） 255.255.255.0 （设置以太口地址）R1(config-if)#exitR1(config)#router ospf 1R1(config-router)#network 192.0.0.1 （5） area 0R1(config-router)#network 192.1.1.1 （6） area 0
路由器R1的拓扑连接和地址分配如下图所示，如果在R1上安装OSPF协议，运行命令：router ospf 200，则配置E0和E1端口的命令分别是______。A．network 10.1.1.0 255.255.255.0 area 0 network 192.168.1.0 255.255.255.0 area 1B．network 10.1.1.1 255.255.255.0 area 0 network 192.168.1.1 255.255.255.0 area 1C．network 10.1.1.255 0.0.0.8 area 0 network 192.168.1.255 0.0.0.8 area 1D．network 10.1.1.0 0.0.0．255 area 0.0.0.0 network 192.168.1.0 0.0.0.255 area 1
在[问题1]和[问题2]中，所使用的是静态路由协议。当该公司有多个分支机构，决定使用动态路由协议OSPF。下面是分支机构路由器R1的配置命令列表，在空白处填写合适的命令/参数，实现R1的正确配置。(注：点对点链路的area为2，分支机构局域网的area为3)。R1＞enR1conf termR1(config)no ip routeR1(config)router [ (6) ]R1(config-router)network[ (7) ]area 2R1(config-router)network[ (8) ]area 3R1(confiq-router)exitR1copy run start
路由器R1的拓扑连接和地址分配如图1-9所示，如果在R1上安装OSPF协议，运行下列命令：router ospf 200，则配置E0和E1端口的命令分别是(40)。A．network 10.1.1.0 255.255.255.0 area 0 network 192.168.1.0 255.255.255.0 area 1B．network 10.1.1.1 255.255.255.0 area 0 network 192.168.1.1 255.255.255.0 area 1C．network 10.1.1.255 0.0.0.8 area 0 network 192.168.1.255 0.0.0.8 area 1D．network 10.1.1.0 0.0.0.255 area 0.0.0.0 network 192.168.1.0 0.0.0.255 area 1
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
ABR R1 has been configured with an area 1 stub no － summary command. Which stubby area type is area 1?() A. StubB. Totally stubbyC. NSSAD. Totally NSSA
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. OSPF is configured on all routers in the network. On the basis of the show ip ospf n eighbor output, what prevents R1 from establishing a full adjacency with R2? () A. Router R1 will only establish full adjacency with the DR and BDR on broadcast multi- access networks.B. Router R2 has been elected as a DR for the broadcast multiaccess network in OSPF area 1.C. Routers R1 and R2 are configured as stub routers for OSPF area 1 and OSPF area 2.D. Router R1 and R2 are configured for a virtual link between OSPF area 1 and OSPF area 2.E. The Hello parameters on routers R1 and R2 do not m atch.
路由器R1的拓扑连接和地址分配如图5-3所示，如果在R1上安装OSPF协议，运行命令router ospf 200，则配置E0和E1端口的命令分别是(26)。A．network 10.1.1.0255.255.255.0 area0 network 192.168.1.0 255.255.255.0 area 1B．network 10.1.1.1 255.255.255.0 area0 network 192.168.1.1 255.255.255.0 area 1C．network 10.1.1.255 0.0.0.8 area 0 network 192.168.1.255 0.0.0.8 area 1D．network 10.1.1.0 0.0.0.255 area 0.0.0.0 network 192.168.1.0 0.0.0.255 area 1
R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1. Which of the following is true?（）A、R1 loses and then re - establishes neighborships with all neighbors.B、R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.C、R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).D、R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).
Router R1, an ASBR connected to the Internet and to backbone area 0, has been configured with a default - information originate command. Which of the following is true about the effects of this configuration command?（）A、R1 will always create and flood a default route into the OSPF domain.B、R1 will create and flood an LSA for prefix/length 0.0. 0.0/0 into the OSPF domain if R1's IP routing table has a route to 0.0.0.0/0.C、R1 will set a flag on the LSA for the subnet between itself and one of the ISPs, noting this subnet as a default network, regardless of whether R1 has a default route.D、R1 w ill set a flag on the LSA for the subnet between itself and one of the ISPs, noting this subnet as a default network, but only if R1 has a route to 0.0.0.0/0.
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.
The following command output was gathered from Router R1, an ABR between areas 0 (backbone) and area 1. In this internetwork, area 0 contains all the subnets of cla ss A network 10.0.0.0. R1's OSPF process has a distribute - list prefix question in command configured. Assuming the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq 20 permit 0.0.0.0/0 le 32A、R1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1B、R1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 into area 1C、R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablED、R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE
Use the same scenario as the previous question, w ith one changE.Instead of the distribute-list prefix question in command configured on R1,R1's OSPF process has an area 1 filter-list prefix question in commandconfigured. Again assuming that the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq 20 permit 0.0.0.0/0 le 32A、R1 will not create/flood a type 3 LSA for su bnet 10.1.2.0/26 into area 1B、R1 will not create/flood a Type 3 LSA for subnet 10.1.2.0/24 into area 1C、R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablED、R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE
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.
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ABR R1 has been configured with an area 1 stub no - summary command. Which stubby area type is area 1?（）AStubBTotally stubbyCNSSADTotally NSSA
多选题R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1. Which of the following is true?（）AR1 loses and then re - establishes neighborships with all neighbors.BR1 no longer advertises 10.1.1.0/24 to neighbors into area 1.CR1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).DR1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).
单选题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 3AR1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.BThe ping 4.4.4.4 command on R1 must currently be successful.CR1's Fa0/0 OSPF cost is 3.D4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
单选题请问以下配置中，R1的OSPF路由器ID是什么（） R1（config）#interface s0/0/0 R1（config-if）#ip add 192.168.2.1 255.255.255.252 R1（config）#int loopback 0 R1（config-if）# ip add 10.1.1.1 255.255.255.255 R1（config）#router ospf 1 R1（config-if）#network 192.168.2.0 0.0.3.255 area 0A192.168.2.1B10.1.1.1C192.168.2.0D255.255.255.255
单选题R1 is internal to area 1, and R2 is internal to area 2. Subnet 10.1.1.0/24 exists in area 2 as a connected subnet off R2. ABR ABR1 connects area 1 to backbone area 0, and ABR2 c onnects area 0 to area 2. Which of the following LSAs must R1 use when calculating R1's best route for 10.1.1.0/24?（）AR2's Type 1 LSABSubnet 10.1.1.0/24's Type 2 LSACABR1's Type 1 LSA in area 0DSubnet 10.1.1.0/24's Type 3 LSA in Area 0E Subnet 10.1.1.0/24's Type 3 LSA in Area 1
多选题A company uses Routers R1 and R2 to connect to ISP1 and ISP2, respectively, with Routers I1 and I2 used at th e ISPs. R1 peers with I1 and R2; R2 peers with I2 and R1. R1 and R2 do not share a common subnet, relying on other routers internal to the Enterprise for IP connectivity between the two routers. Which of the following could be used to prevent potential routing loops in this design?（）AUsing an iBGP mesh inside the Enterprise coreBConfiguring default routes in the Enterprise pointing to both R1 and R2CRedistributing BGP routes into the Enterprise IGPDTunneling the packets for the i BGP connection between R1 and R2
单选题The following command output was gathered from Router R1, an ABR between areas 0 (backbone) and area 1. In this internetwork, area 0 contains all the subnets of cla ss A network 10.0.0.0. R1's OSPF process has a distribute - list prefix question in command configured. Assuming the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq 20 permit 0.0.0.0/0 le 32AR1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1BR1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 into area 1CR1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablEDR1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE