單項選擇題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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1.多項選擇題Which three statements about NetFlow are true？ （）

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.

2.多項選擇題Which three statements about NetFlow are true？（）

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.

3.多項選擇題Which three modes are the operating of HDLC？（）

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）

4.多項選擇題Which three of these statements about the IP service level agreement （SLA） sender are true？ （）

A.SLA sender target can be an IP host
B.SLA sender sends a probe packet and a response probe packet
C.SLA sender sends a probe packet
D.SLA sender target must be a router
E.SLA sender target can be an IP SLA responder

5.多項選擇題Which three of these statements about PPPoP are true？（）

A.You must install PPPoP client software on all hosts that connects to the Ethernet segment this means that the access provider must maintain a CPE
B.PPPoP can provide a host with access to a destination over Ethernet. You can have only one PPPoPsession per PVC
C.PPPoP implementation is susceptible to broadcast storms and possible denial-of-service attacks
D.You cannot use PPPoP with Cisco Service Selection Gateway
E.Per-session accounting is possible， which allows the service provider to charge the subscribe based onsession time for various services offered. The service provider can also require a minimum access change