Checking And Assigning IP Address’s To Interfaces of Cisco Router

Checking Cisco Router Interfaces And Assigning IP Address to Different Interfaces:

Checking and Assigning IP Address to Cisco Router Interfaces

Checking Cisco Router Interfaces:

For CCNA exam perspective and network administration perspective it is necessary to know all the interfaces of a Cisco router and its configurations. Checking router interfaces play a great role in troubleshooting which often results in solving the connectivity problem by correcting the misconfigured interfaces of router.

Command for displaying all interfaces of a Cisco router is “show ip interface brief”

UPAAE > enable                               // for executing this command you need to be in enable mode.

UPAAE # show ip interface brief


checking cisco router interfaces

Assigning IP Address to Fast Ethernet Interface of Cisco Router:

In the above screenshot you have seen that none of the interface is configured, for assigning IP Address to a fast Ethernet port you have to be in global configuration mode. At global configuration mode enter this command “interface fa 0/0”.

This command has three parts 1 interface, 2 type of interface, 3 the port number.

The first part of this command is same for Ethernet and serial ports, the second part is where you have to specify whether you are configuring Serial interface or Ethernet interface(in our case we are going to configure IP address for Ethernet interface), “fa” stands for fast Ethernet. In the third part you have to specify the interface/port number in our case we are going to configure Ethernet port number 0/0.

If you don’t know the interface/ port number of your router run this command ”show ip interface brief” and note the specific interface number of concern.

Interface fa 0/0 will take you to the interface configuration mode where IP Address can be assigned to this interface. Follow the screenshot below.

assigning ip address to fast ethernet port on cisco router

Assigning IP Address to Serial Interface of Cisco Router:

The command syntax for configuration of serial interface is same as the configuration of Ethernet interface but the variables in the command are different, the command structure will be “interface serial 0/0”. For knowing your Cisco router serial port numbers execute this command “show ip interface brief” from enable mode. Steps for assigning IP address to a serial interface is demonstrated in the following screenshot.

Assigning ip address to serial interface on a Cisco Router

Checking if IP Addresses are Properly Assigned:

Validating Cisco Router interfaces Configuration

I am always here to help, please do ask in comments for any problem regarding this tutorial.

Recommended Resources for CCNA Exam:

Following resources are my personal recommendation for CCNA exam preparation, i know that i should recommend one best and most trusted resource but these are all my favorite, choosing only one among these great resources would be a biased decision according to my point of view. You can choose anyone from the following resources and i am 98% sure it will get you CCNA Routing and Switching certificate.

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