A.session 1, destination 2, tunnel 3
B.destination 1, session 2, tunnel 3
C.tunnel 1, session 2, destination 3
D.destination 1, tunnel 2, session 3
参考答案:D
A.session 1, destination 2, tunnel 3
B.destination 1, session 2, tunnel 3
C.tunnel 1, session 2, destination 3
D.destination 1, tunnel 2, session 3
参考答案:D