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