单项选择题
A. They are originated by Area Border Router and are sent into a single area to advertise an Autonomous System Border Router.
B. They are originat ed by Area Border Routers and are sent into a single area to advertise destinations outside that area.
C. They are originated by the DR on every multi - access network. They include all attached routers including the DR itself.
D. They are originated by every router in the OPSF network. They include all routers on the link, interfaces, the cost of the link, and any known neighbor on the link.
单项选择题 Refer to the exhibit. On the basis of the configuration provided, how are the Hello packets sent by R2 handled by R5 in OSPF area 5?（）
单项选择题 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? （）
单项选择题 When troubleshooting an EIGRP connectivity problem, you notice that two connected EIGRP routers are not becoming EIGRP neighbors. A ping between the two routers was successful.What is the next thing that should be checked?（）