计算机命令：

PCA login: root                                     ；使用root用户

 password: linux                                    ；口令是linux

# shutdown -h now                                   ；关机

# init 0                                            ；关机

# logout

# login

# ifconfig                                          ；显示IP地址

# ifconfig eth0 <ip address> netmask <netmask>      ；设置IP地址

# ifconfig eht0 <ip address> netmask <netmask> down ; 删除IP地址

# route add 0.0.0.0 gw <ip>

# route del 0.0.0.0 gw <ip>

# route add default gw <ip>                         ；设置网关

# route del default gw <ip>                         ；删除网关

# route                                             ；显示网关

# ping <ip>

# telnet <ip>                             ；建立telnet之前先ping一下

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

交换机基本状态：

switch:                                             ；ROM状态, 路由器是

rommon>

hostname>                                           ；用户模式

hostname#                                           ；特权模式

hostname(config)#                                   ；全局配置模式

hostname(config-if)#                                ;