单选题What is the function of L2TP？（）A It allows L2F tunnels across the network.B It allows GRE tunnels across the network.C It allows PPTP tunnels across the network.D It allows PPP to be tunneled across a network
题目
单选题
What is the function of L2TP？（）
A
It allows L2F tunnels across the network.
B
It allows GRE tunnels across the network.
C
It allows PPTP tunnels across the network.
D
It allows PPP to be tunneled across a network