单选题A user is connected on a DSL line and is using a PPP over Ethernet service. Which network device encapsulates the datagram inside of an ATM header?（）A DSLAMB DSL modemC ERX Edge RouterD customer workstation
题目
单选题
A user is connected on a DSL line and is using a PPP over Ethernet service. Which network device encapsulates the datagram inside of an ATM header?（）
A
DSLAM
B
DSL modem
C
ERX Edge Router
D
customer workstation