单项选择题
A.network 0.0.0.0 255.255.255.255 area 0
B.network 0.0.0.0 0.0.0.0 area 0
C.network 255.255.255.255 0.0.0.0 area 0
D.network all-interfaces area 0
单项选择题 Refer to the exhibit.If the router Cisco returns the given output and has not had its router ID set manually, what value will OSPF use as its router ID?（）
单项选择题 A network administrator creates a layer 3 EtherChannel, bundling four interfaces into channel group 1. On what interface is the IP address configured?（）
单项选择题 What parameter can be different on ports within an EtherChannel?（）