Admin n Password 管理密码
n option：新密码。
Connect to the switch using the serial console port with a straight serial cable (9600, 8-n-1, no flow control) with default no user ID or password required.
用串口直连电缆连接到每台交换机的串行控制端口(9600、8 - N - 1、无流控制)，默认下不需要用户ID和密码。
The aim is to get something like SSH -n host whoami to work without being asked for a password.
这样做的目的是能够不需询问密码就可以执行ssh - n host whoami这样的命令。
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