網路原理(一) Section 2.2

hostname name
Hostnames that appear in CLI prompts can be used in various authentication processes between devices, and should be used on topology diagrams.

strong passwords
強密碼

enable secret class
啟用秘密類別

line console 0
The zero is used to represent the first (and in most cases the only) console interface.

password cisco
cisco密碼

login
登入

line vty 0 15
Many Cisco switches support up to 16 VTY lines that are numbered 0 to 15.

以下都是些Cisco的專用東西，就不一一介紹了。
service password-encryption

banner motd # the message of the day #

Startup configuration
The file stored in Non-volatile Random Access Memory (NVRAM) that contains all of the commands that will be used by the device upon startup or reboot

Non-volatile Random Access Memory (NVRAM)
NVRAM does not lose its contents when the device is powered off.
volatile (揮發)

Running configuration
The file stored in Random Access Memory (RAM) that reflects the current configuration. 

Random Access Memory (RAM)
隨機存取記憶體

show running-config ; copy running-config startup-config
To save changes made to the running configuration to the startup configuration file use the copy running-config startup-config privileged EXEC mode command.

reload
use the reload privileged EXEC mode command to restore the startup-config.