Cisco IOS routers allow network administrators access to a wide range of show and debug commands. The show command displays various information about the router's state of play, such as the Ethernet collisions on a particular interface or a router's configuration file. Only a subset of show commands is available when in User EXEC mode. The full range is available when in privilege EXEC mode (PRIV EXEC mode).
The debug command is a more advanced IOS command that allows the administrator to view the router's analyses of packets or buffering mechanisms and is used only to troubleshoot a device or complete network. The debug command is very CPU-intensive.
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