历史的发展，并不是刀断斧劈式的，而是一个有机体。就像一个人，从少年到老年，他体内有一以贯之的东

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.

ee OSPF neighbors, one connected to each of its three physical interfaces. Which statement is correct about router C？（）

A. It is configured and functioning correctly as an OSPF internal router.

B. It is configured and functioning correc tly as an ABR attached to stub area 4.

C. It is configured and functioning correctly as an ASBR attached to external area 4.

D. It is configured and functioning correctly as an ABR attached to totally stubby area 4.

E. It is not configured correctly to function as specified.

A. On the ABR router ospf 10 area 3 stub

B. On all Area 3 routers router ospf 10 area 3 stub

C. On all Area 3 routers router ospf 10 area 3 stub no - summary

D. On the ABR router ospf 10 area 3 nssa

E. On the ABR rou ter ospf 10 area 3 stub no - summary

te command output on router R1 lists the following phrase: "Gateway of last resort is 1.1.1.1 to network 2.0.0.0".Whic h of the following is most likely to have caused this output to occur on R1？（）

A. R1 has been configured with an ip default- network 2.0.0.0 command.

B. R1 has been configured with an ip route 0.0.0.0 0.0.0.0 1.1.1.1 command.

C. R1 has been configured with an ip route 2.0.0.0 255.0.0.0 1.1.1.1 command.

D. Another router has been configured with an ip default - network 2.0.0.0 command.

E. Another router has been configured with an ip route 2.0.0.0 255.0.0.0 1.1.1.1 command.

ter 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.

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).

configuration mode: area 4 stub.Which two things need to be done to finish making area 4 a totally stubby area？（）

A. Apply the area 4 stub command to all routers in the area

B. On the ABR, use the area 4 stub command with the no - summary keyword

C. On the ABR, specify a default cost for the area with the area default - cost command

D. On the ABR, use the default - information originate command to inject a default route into area 4

E. Use the auto - cost command on each router in the area to automatically determine the cost to other OSPF areas

A. to aggregate routes learned from the ABR

B. to lower the cost of routes advertised by the ABR

C. to connect a non-contiguous area to the backbone

D. to decrease the size of the link-state database in that area

A. Only redistributed RIP routes will appear in Area 1. They will be advertised via t ype 7 LSAs

B. No redistributed routes can appear in Area 1, only summary routes

C. Redistributed RIP and IGRP routes will appear in Area 1. They will be advertised via type 5 LSAs

D. Only redistributed IGRP routes will appear in Area 1. They will be advertised via type 7 LSAs