单项选择题
A.ipv6 address PREFIX_1::1/64
B.ipv6 autoconfig 2001:db8:2222:7272::72/64
C.ipv6 autoconfig
D.ipv6 address 2001:db8:2222:7272::72/64
单项选择题 In order to allow the establishment of a Telnet session with a router, which set of commands must be configured（）。
单项选择题 If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20，what is the maximum number of host sallowed on this subnet？（）
单项选择题 Why will a switch never learn a broadcast address？（）