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Module 2: Introduction to Routers
| Command | Command Description | Command Syntax
2.1.3 | enable | To enter privileged EXEC mode, or any other security level set by a system administrator, use the enable EXEC command. | enable [privilege-level]
| exit | Use the exit command at the EXEC levels to exit the EXEC mode. | exit
| ? | To display a brief description of the help system, enter the help command. | ?
| disable | To exit privileged EXEC mode and return to user EXEC mode, or to exit to a lower privilege level, enter the disable EXEC command. | disable [privilege-level]
2.1.4 | show version | To display the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot images, use the show version EXEC command. | show version
| show flash | To display the layout and contents of a Flash memory file system, use the show EXEC command. | for Class A Flash file systems: show flash-filesystem: [all | chips | filesys] for Class B Flash file systems: show flash-filesystem: [partition number] [all | chips | detailed | err | summary] for Class C Flash file systems: show flash-filesystem: for all Flash file systems: show flash is an acceptable, informative usage
2.1.5 | copy tftp flash | To copy an IOS image stored on a TFTP server into the flash memory of the router. | copy tftp {file-id | flash | config}
2.2.1 | setup | To enter the setup command facility, use the setup privileged EXEC command. You can use the setup command facility to create a basic configuration to get a router up and running, but for advanced features and fine tuning of router processes, use the command line. | setup
2.2.5 | enable secret | To specify an additional layer of security over the enable password command, use the enable secret global configuration command. | enable secret [level level] {password | [encryption-type] encrypted-password}
| enable password | To set a local password to control access to various privilege levels, use the enable password global configuration command. | enable password [level level] {password | [encryption-type] encrypted-password}
| disable | To exit privileged EXEC mode and return to user EXEC mode, enter the disable EXEC command. | disable [privilege-level]
2.2.6 | clock | To manually set the system clock, use one of the formats of the clock set EXEC command. | clock set hh:mm:ss day month year clock set hh:mm:ss month day year
| Ctrl-P | Press Ctrl-P or the up arrow to repeat the previous command entry automatically. | Ctrl-P
2.2.7 | terminal no editing | To disable enhanced editing mode, this command is entered at the privileged EXEC mode prompt. | terminal no editing
| Ctrl-A | Moves cursor to the beginning of a command line. | Ctrl-A
| Esc-B | Moves cursor back one word. | Esc-B
| Ctrl-B | Moves cursor back one character. | Ctrl-B
| Ctrl-E | Moves cursor to the end of the command line. | Ctrl-E
| Ctrl-F | Moves cursor forward one character. | Ctrl-F
| Esc-F | Moves cursor forward one word. | Esc-F
| Ctrl-Z | Ctrl-Z is a command used to back out of configuration mode. | Ctrl-Z
2.2.8 | terminal history size | To change the number of command lines the system records during a terminal session, use the terminal history size or the history size command. | terminal history size number-of-lines
| history size | To change the number of command lines the system records during a terminal session, use the terminal history size or the history size command. | history size number-of-lines
| Ctrl-N | Used to recall successively more recent commands. | Ctrl-N
| Tab | When typing commands, as a shortcut, the Tab key may be entered for a command, and the interface will finish the entry. | Tab
2.2.9 | show running-config | This command allows you to view the current configuration in the RAM. This configuration is the active configuration, and changes made to the router will show up in this configuration file. | show running-config

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