最佳答案应该是D选项。解析如下:“show users” is "Display information about terminal lines",也就是说,它用来显示登陆到本机的用户的信息,包含telnet过来的,也有通过console线直接登陆的,等等;“show sessions” is "Information about Telnet connections",也就是输出本机访问远程主机的telnet会话,故最佳答案为D。
举例:
R4#sh users
Line User Host(s) Idle Location
* 0 con 0 idle 00:00:00
130 vty 0 cycle idle 00:04:45 192.168.12.1
131 vty 1 daniel idle 00:02:23 192.168.23.2
132 vty 2 john idle 00:04:18 192.168.34.3