单项选择题
Which command enables IPv6 forwarding on a cisco router?（）
A. ipv6 host B. ipv6 unicast-routing C. ipv6 local D. ipv6 neighbor
单项选择题 In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?（）
单项选择题 Which IPv6 address is valid?（）
单项选择题 Which of the following protocols uses both TCP and UDP ports?（）
