A. The ABR must have multiple interfaces connected to the backbone areA
B. An ABR is a router with two interfaces, each connected to a different nonbackbone areA
C. The only requirement to be considered an ABR is at least one interface connected to the backbone areA
D. An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA
第1题：
To make OSPF area 4 totally stubby, the following command was issued on the ABR in router 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
第2题：
A. A virtual link to area 0.
B. OSPF summarization command.
C. default - cost extension to the area command.
D. no - summary extension to the area stub comm and.
E. None of the other alternatives apply
第3题：
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.
第4题：
Which statement about OSPF ASBR summary LSA is true？（）
第5题：
A.It is used for type 1 router LSA
B.Highest IP address of the loopback is used
C.router-id needs to be matched on ospf neighbors
D.router-id is 16 bit
第6题：
Refer to the exhibit. The partial configuration for an OSPF ASBR and an Area 0 ABR is shown. Assume the OSPF configurations throughout the network are operable. Which statement about these configurations is true? （）
A. The ASBR route - maps are basically useless, because there are no deny prefix - lists.
B. LSA Type 5s wil l not be received by the ABR from the ASBR.
C. The OSPF backbone will not learn any RFC 1918 addresses.
D. The matched prefix - list addresses will be given a metric of 255, which is essentially unreachable.
第7题：
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
第8题：
Refer to the exhibit. Router C was configured so that it could form an adja cency with three 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.
第9题：
Which is true about OSPF router-id?（）
第10题：
Which of the following is an OSPF configuration parameter that is used on an ABR, but not on an internal router？（）