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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

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