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As you've already seen in the previous sections, one of the most useful commands on the router is the show command. You can use this command to view the status of all the interfaces on the router and the network protocols currently being routed. The more you know about how to use show in different instances, the better you will do on the CCNA exam. Table 3.4 provides a summary of some of the more useful show commands.

Table 3.4 Router Examination Commands

Command

Results

show running-config

Privileged command that shows the router configuration currently running in RAM.

show startup-config

Privileged command that shows the router configuration stored in the router's NVRAM. It's loaded by the router when the router is rebooted.

show CDP neighbor

Shows the routers that are directly connected to your router by LAN or serial connections.

show clock

Shows the time and date settings for the router.

show flash

Shows the IOS file or files contained in the router's Flash RAM and the amount of total Flash RAM and used Flash RAM.

show history

Shows a list of your last 10 commands.

show hub

Shows information on the status of the hub ports of a 2505 router.

show interface.[interface number]

Shows the current configuration of a ethernet specified Ethernet interface

show interface serial [interface number]

Shows the current configuration of a specified serial interface.

show interfaces

Lists all the interfaces on the router and statistics related to the interface, such as their current configuration and encapsulation. Also tells you whether the interface is active.

show processes

Shows CPU utilization information.

show protocol

Lists the routing protocols configured on the router.

show version

Shows the version of the IOS currently running on the router.

show memory

Displays information about the memory available on the router after the system image loads (show memory free shows only free RAM).

Several of these show commands are revisited throughout the book as you configure router interfaces and other router parameters in the chapters on TCP/IP, IPX/SPX, and WAN Protocols.

 

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