多项选择题
A.6to4 tunneling
B.VPN tunneling
C.GRE tunneling
D.ISATAP tunneling
E.PPP tunneling
F.Teredo tunneling
单项选择题 Given the output of the Floor3 switch, what statement describes the operation of this switch（）。
单项选择题 Running both IPv4 and IPv6 on a router simultaneously is known as what?（）
单项选择题 What is the default maximum number of equal-cost paths that can be placed into the routing of a cisco OSPF router?（）