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）


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1.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

2.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

3.多項選擇題Which two statements about spanning tree path cost are true？（）

A.The path cost can be changed for an interface using the spanning-tree cost command
B.The path cost can be changed for an interface using the stp path-cost command
C.The SPT default path cost depends on the interface speed
D.The STP default path cost is similar for all interface

5.多項選擇題Which three of these are major components of an MPLS VPN network？ （）

A.LDP notification
B.L2TPv3 session
C.VPN route target communities
D.Multiprotocol BGP peering of PE routers
E.MPLS forwarding