单项选择题
A. ipv6 host B. ipv6 unicast-routing C. ipv6 local D. ipv6 neighbor
In the implementation of VLSM techniques on a network u...
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?（）
A. 255.255.255.240 B. 255.255.255.254 C. 255.255.255.252 D. 255.255.255.0 E. 255.255.255.248
Which IPv6 address is valid?（）A. 2031:0:130F::9C0:876A:...
单项选择题Which IPv6 address is valid?（）
A. 2031:0:130F::9C0:876A:130B B. 2001:0DB8:0000:130F:0000:0000:08GC:140B C. 2001:0DB8:0:130H::87C:140B D. 2031::130F::9C0:876A:130B
Which of the following protocols uses both TCP and UDP ...
单项选择题Which of the following protocols uses both TCP and UDP ports?（）
A. SMTP B. Telnet C. FTP D. DNS
