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ccna training cost in dubai.List access listsaccess-lists accounting accounting data for active sessionsRouter# showIn this example, you get context-sensitive help for the command show, but after displaying this help information, the command showo is displayed on the command line because the IOS assumes that you want to enter the parameters for this command, so you re-enter the command in the CLI. This can be annoying because if you forget this feature of your router and in turn re-enter the command, the result will look similar to the following.Router# showshowThe CLI always parses the commands you enter and checks their validity using the syntax check feature. Any non-existent or incorrectly entered commands will cause the IOS to display an error message with a description of the error.Practical Experience As long as the command is entered correctly, IOS will usually not provide output unless the command will modify the state of the router or its components, such as enabling or disabling the interface. Therefore, if IOS displays a message after you enter a command, you should assume that there is a problem with the command.Of course, when configuring an IOS device, it is inevitable that you will enter a command incorrectly or enter an invalid command. It would be cruel if you entered a command containing 20 arguments, mistyped the last character, and Cisco asked you to re-enter the entire command. The command logging feature is useful in that it allows you to fetch and edit previously executed commands. The next two subsections discuss how to fetch and edit previously executed commands.1. Command Line HistoryOn any IOS device, you can use the command showhistory to view previously entered commands.