barcode font excel 2016 Logging into the Router: User EXEC Mode in Software

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Logging into the Router: User EXEC Mode
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There are two modes in the IOS: user EXEC mode and privileged EXEC mode (also known as enable mode)The router prompt shown in the preceding section is the user EXEC mode prompt, from which you can execute limited router commands These commands are actually a subset of the privileged EXEC mode commands At any time, you can enter help at the router prompt to display a list of available commands and command arguments For example, the show command is used frequently in the management of the Cisco IOS This command has many possible arguments, which you can list by typing one of these commands: router>show help or router>show Try this now; type router>show privilege In the response, you'll see that you have privilege level 1 Cisco routers can have up to 15 different privilege levels The defaults are privilege 1 for user EXEC mode, and privilege 15 for enable mode (covered in the following section) Over time, with a little experience using the IOS, you'll know these common commands
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Many more commands are available in privileged (enable) mode This is where the router configuration changes are made From here, you can enter the global configuration mode and set up the router and its interfaces Privileged mode is usually password protected, and the encrypted enable password is stored internally by the router See the section "Setting the Enable Password" At the EXEC mode prompt, type router>enable (Remember, the router portion of the prompt you see will be the host name of your router) Next you'll be prompted as follows: password>
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Enter your enable password after this prompt If an enable password has not yet been set, the enable mode can only be accessed via the console port If you are connected through the console port and no enable password has been set, simply press Enter The next prompt you see is router# The # in the prompt tells you that you are in privileged (enabled) mode From this prompt you can set up interfaces, change passwords, and perform other router management operations Following are some of the more commonly used commands in the privileged mode: show Shows information about the running configuration telnet Initiates a Telnet session disable Returns you to the user EXEC mode configure Enters global configuration mode To list these and other commands, type at the enable prompt Note that someof these commands can be executed in the user EXEC mode, as well
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As mentioned earlier, the Setup utility is run when you first boot up a new router Executing the setup command on an already configured device will initiate a simple setup procedure that allows you to set passwords, establish interfaces with IP addresses, and more This is an easy way to configure the router, but it is limited If you want to dig in and get to the heart of the router configuration, use the CLI configuration mode Let's go back to the privileged mode prompt (the one with a # after the router name) After theprompt, type router#>show running-config The response to this command shows you the current running configuration of the router The running configuration will be lost if you power down or reload the router If you use the router#>show config command, you will see what is written in nonvolatile RAM (NVRAM) This configuration is not lost if the router is powered down or reloaded (with the reload command) In order to ensure your configuration is safe, remember to use the router#>write memory command after you make changes to the running configuration This takes the current running configuration and writes it to memory Now it's safe to power down the router, and you won't lose your configuration NoteIf you neglect to write your configuration to memory after changing the configuration, you won't see your changes when you use the show configuration command Your changes will be in effect, but only in the running configuration, which you can view using the show runningconfiguration command
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