99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項選擇題

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

微信掃碼免費搜題