A.dir recycle-bin
B.dir trash
C.dir /all
D.dir all-file

A.clear trash
B.reset recycle-bin
C.clear all
D.reset trash-bin

A.RAM
B.ROM
C.Memory
D.Recycle-bin

A.display all
B.display ip interface
C.display system-information
D.display diagnostic-information

A.display running
B.display software
C.display version
D.display current-version

A.time
B.clock
C.clock datetime
D.set datetime

A.get
B.put
C.download
D.load

A.display boot
B.display begin
C.display startup
D.display start-configuration

A.中间网络路由配置不对
B.Telnet密码设置不正确
C.路由器Telnet服务没有启动
D.中间网络阻止了PC对路由器的TCP端口23发起连接

A.display history-cli
B.display history-area
C.display history-command
D.display history-cache