RAM - RAM is used by a Cisco device for working storage.

The following list explains the four main types of memory found in Cisco switches or Cisco routers, as well as the most common use of each type: In order to load all configuration data back after the device loses power, Cisco use several types of more permanent memory. Cisco devices have random-access memory (RAM) to store data from the configuration file while Cisco IOS is using it, but the RAM loses its contents when the device loses power.

Where Configuration Files are StoredĪ Cisco device needs to use the configuration file to do its work. Use the ? command to get answers to your questions about other commands, such as their syntax and description.

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The hostname command assigns a network name to the Cisco device. In short, show is for reporting and debug is for monitoring. As a result, the debug command takes more CPU cycles, but it lets you monitor what is happening in a switch in real time. However, instead of just listing the current status, the debug command asks the device to continue monitoring different processes in it and send messages to the user when different events occur, showing the status of settings over time. Like the show command, debug reveals information about the device’s settings. For example, the show version command displays information about the Cisco IOS version currently loaded on a device. It reads the current configuration from the Cisco device’s RAM and lists the requested settings in the CLI. The show command is one of the most helpful commands because you can find the status of almost every feature of the Cisco IOS. One is interface configuration mode, which can be entered by running the interface FastEthernet 0/1 ( int fa0/1) configuration command. Ĭonfiguration mode contains several sub-modes. To enter configuration mode, a user executes the configure terminal ( conf t) command.

Commands entered in configuration mode update the active configuration file, but the actual changes in configuration take place only after the device reboots. Unlike exec and enable mode, configuration mode accepts configuration commands - commands that tell the switch the details of what to do and how to do it.

Global configuration mode - Allows users to enter nondisruptive commands and display some information.

To enter this mode, the user runs the enable command mode.

Enable mode (privileged mode or privileged exec mode) - Allows the user to execute privileged commands, such as the reload command, which tells the switch to reboot the Cisco IOS.

Accessing the CLI by any of the three methods logs the user into Exec

Exec mode (user mode) - Allows the user to look around but not change anything.

Users can be logged in to a Cisco device using the following modes:

Free Download: Cisco Commands Cheat Sheet.

Cisco ios tftp server