The top commands to know for the CCNA certificate would be the variations of the ‘show’ command. Common simulator questions would be presenting you with a set of configured devices and asking you to find information about these devices. Knowing these commands wouldn’t only be helping you succeed at the CCNA but would be immensely helpful when you would be working with a router whose configuration you don’t have memorized or documented.

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Here are some CCNA basic commands:

show running-configuration

The ‘show run’ command is considered to be by far the most useful ‘show’ command you would ever come across. It would be able to give you a page by page report on how the current device would be setting up. This would include the interface information like the IP address, if the interface would be shutting down, etc. You could also observe the device-wide information like which passwords are set, if SSH or telnet would be setting up and ready for login, etc. You could see when the configuration would be last updated as well as saved along with VLAN information.

show interfaces

This command would show you detailed information regarding the interfaces on the device. The knowledge as ‘show int’ alone would be displaying the information about each configured on the device, one after the other.

If you would be looking for information on a specific interface, you could input the type and a number of the interface to gain the knowledge about only that one interface; for instance, ‘ show int fa 0/1’ would be only demonstrating you the info regarding FastEthernet 0/1.

show IP route


‘Show IP route’ would display the routing table utilized to find where to send data. This is what you would use for observing the next hop for every packet. This is considered to be a layer-3 command.

It demonstrates which interface would be able to send out a packet destined for a particular IP address. This command would also be able to tell you how the device learned of that route. You could find out if the path is directly static, connect, or learned through a routing protocol like RIP or OSPF.

show IP interface

The ‘show IP int’ command would give you the detailed layer-3 report of an interface. Such as the ‘show interfaces’ command, you would be able to specify a specific interface to look at like the ‘show IP int g 0/2’. This command would portray information like the incoming and outgoing access list, the IP address, and the network mast.

The power ‘show IP interface brief’ would also be extremely resourceful for quickly seeing which interfaces are up and what IP address would be assigned to each interface. This is a concise and quick way to observe what the primary interface status looks like.

show access-list

This command would be able to display the access-lists on the device. This would be consisting of every line of the access-list but doesn’t indicate which interface that access-list would be applied to. To see where an access-list would be involved, you would be willing to run the ‘show run’ or ‘show IP interface’ commands.

Do note down that the ‘show access-list’ command demonstrating access lists for all protocols, whereas ‘show IP access-list’ only portrays IPv4 access-lists and might excluding other existing access-lists, like the IPv6 access-lists. Remember that each access list would be unstated last command of ‘deny any’. Utilize the ‘show access-list’ command for observing exactly what an access-list would be doing.

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