单项选择题
A.The OSPF area is not configured properly.
B.The priority on R1 should be set higher.
C.The cost on R1 should be set higher.
D.The hello and dead timers are not configured properly.
E.A backup designated router needs to be added to the network.
F.The OSPF process ID numbers must match.
单项选择题 Refer to the exhibit.The network administrator is in acampus building distant from Building B.WANRouter is hosting a newly installed WAN link on interface S0/0.The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface.How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?（）
单项选择题 Refer to the exhibit.How many broadcast domains exist in theexhibited topology？（）
单项选择题 As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?（）
