多項選擇題下列哪些是TACACS+的關鍵因素（）

A.不兼容TACACS和XTACACS
B.認證和授權分離
C.加密所有通信
D.使用TCP端口49


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1.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

2.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

3.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.

4.單項選擇題Which statement about RIPng is true?（）

A.RIPng allows for routes with up to 30 hops.
B.RIPng is enabled on each interface separately.
C.RIPng uses broadcasts to exchange routes.
D.There can be only one RIPng process per router.

5.多項選擇題AAA認證管理性接入的用戶或遠程網絡接入的用戶，采用（）模式請求AAA服務

A.包模式
B.交換模式
C.字符模式
D.密文模式