问题:
A . to provide VPN access over L2TP
B . to enable PPP session from the router to the termination device at the headend for metro Ethernet connectivity
C . for DSL connectivity and removing the need for the end - user PC to ru n the PPPoE client software
D . for connecting the router to a cable modem, which bridges the Ethernet frames from the router to the cable modem termination system
● 参考解析
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