The basics of Cisco administration
1. Cisco operating modes
User mode (User EXEC): basic access, limited to observation.
Privileged mode (Privileged EXEC): access to configuration and diagnostic commands.
To access: enable or en
Global configuration mode: modification of the system configuration.
To access: configure terminal or conf t
2. Basic configuration commands
| hostname <name> | Set hostname |
|
line console 0 password <password> login |
Enables console authentication. |
| no ip domaine lookup | Disables DNS lookup, avoids delays when a command error occurs. |
| enable password <password> | Password for privileged access |
| enable secret <password> | Password for privileged access, encrypted and therefore more secure. |
3. Backing up and restoring the configuration
| copy running-config startup-config | Saves the configuration to NVRAM memory (upon reboot) |
| write memory or wr | Saves the configuration to NVRAM memory (upon reboot) |
| show running-config | Current configuration |
| show startup-config | Configuration upon reboot |
| show version | OS version and system information |
| show interfaces | Network interface status |
4. Backup/Restore with a TFTP server
The device will ask you for the server's IP address and the file name.
| copy running-config tftp: | Backup to a TFTP server |
| copy tftp: running-config | Restoring from a TFTP server |