56. Which one of these statements is true of OSPF type 5 LSAs?

　　哪一个发送OSPf类型5的LSA

　　A. They are used to summarize area routes to other areas.

　　B. They are used in not-so-stubby areas to propagate external routes.

　　C. They are used to notify areas of the ASBR.

　　D. They are flooded to all areas except stub areas (external route).

　　由外部路由器通过末端区域发送到整个区域

　　Answer: D

　　57. Which OSPF LSA type does an ASBR use to originate a default route into an area?

　　在OSPF协议中ASBR在一个区域从外部发送默认路由使用哪种LAS

　　A. LSA 1 B. LSA 3 C. LSA 4 D. LSA 5 E. LSA 7

　　Answer: D

　　58. Refer to the exhibit. Routers A and B are directly connected. Given the configuration, how many EIGRP routes will router B see in its routing table?

　　如图所示，路由器A和B直接相连，这样配置让路由器B得到多少路由表?

　　A. 0 B. 1 C. 2 D. 3 E. 4

　　Answer: A

　　59. Refer to the exhibit. Routers A and B are directly connected and running EIGRP, but they are unable to form a neighbor relationship. What is the most likely cause?

　　如图所示，路由器A和B直接连接并且都运行EIGRP，但是它们没有成为邻居，这是什么问 题

　　A. The network statements are misconfigured.

　　B. The IP address statements are misconfigured.

　　C. The autonomous system is misconfigured.

　　D. There is a physical issue with the cable.

　　Answer: B

　　60. Refer to the exhibit. Routers A and B are directly connected and running OSPF, but they are unable to form a neighbor relationship. What is the most likely cause?

　　如图所示，路由器A和B直接连接并且都运行OSPF，但是它们没有成为邻居，这是什么问题

　　A. The routers are not on the same network.

　　B. The network statements do not match.

　　C. The process number does not match.

　　D. The MTU does not match.

　　E. The OSPF cost does not match

　　. F. There is a physical issue with the cable.

　　Answer: D