单选题In JUNOS software， which type of encapsulation is required on a PE router for the CE-facing interface in a Martini-based VPN？（）A ATMB CCCC HDLCD Ethernet
题目
单选题
In JUNOS software， which type of encapsulation is required on a PE router for the CE-facing interface in a Martini-based VPN？（）
A
ATM
B
CCC
C
HDLC
D
Ethernet