单项选择题
How many messages does Internet Key Exchange use to negotiate SA characteristics when it runs inaggressive mode？（）
A.3
B.4
C.5
D.2
E.6
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多项选择题
WhichthreestatementsaboutNetFlowaretrue？（）
A.LCP is used for PPP over ATM （PPPoA） setup.
B.LCP is used for PPP over Ethernet （PPPoE） setup.
C.LCP is used for PPP over Ethernet （PPPoPR） setup.
D.LCP is used for PPP CHAP authentication.
E.LCP is used for basic PPP link setup and operation. -
多项选择题
WhichthreestatementsaboutNetFlowaretrue？（）
A.NetFlow records unidirectional IP traffic flow.
B.NetFlow records MPLS frame flow.
C.NetFlow expert is only over TCP.
D.NetFlow records is only over UDP.
E.NetFlow records subinterface information of traffic flow. -
多项选择题
WhichthreemodesaretheoperatingofHDLC？（）
A.asynchronous balanced mode （ABM）
B.normal response mode （NRM）
C.normal peer mode （NPM）
D.asynchronous client mode （ACM）
E.asynchronous response mode （ARM）
