單項選擇題

Which line from the output of the show ip interface command indicates a layer 1 problem?（）

A.Serial0/1 is up, line protocol is down
B.Serial0/1 is down, line protocol is down
C.Serial0/1 is up, line protocol is up
D.Serial0/1 is administratively down, line protocol is down

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多項選擇題

Cisco提供（）方法來實現(xiàn)AAA服務

A.基于AAA授權
B.本地AAA認證
C.基于服務器的AAA認證
D.AAA記賬

單項選擇題

Which statement about IPv6 is true?（）

A.Addresses are not hierarchical and are assigned at random.
B.Only one IPv6 address can exist on a given interface.
C.There are 2.7 billion addresses available.
D.Broadcasts have been eliminated and replaced with multicasts.