CertExams.com Simulator Lab Exercises Answers
Description: The purpose of this Lab is to configure a loop back interface and test it for connectivity.
The loopback interface is a logical interface internal to a router. It is not connected to any other device. A loopback interface is UP as long as the router is up and running. It is useful in managing a router as there will always be at least one interface available on the router, irrespective other physical interfaces.
The command used for assigning loopback interface is
Router(config)#interface loopback <number>
The number can be between 0 and 2147483647
A loopback interface is automatically put in "no shutdown" state when created. However, you need to assign an ip address to use a loopback interface.
Network Diagram:
Instructions:
1. Configure s0/0 on R1 with ip address and subnet mask as shown in the diagram
2. Configure s0/0 and loopback 1 on router R2 as shown in the diagram
3. Ping loopback 1 and verify connectivity
R1>enable
R1#conf term
R1(config)# int serial 0/0
R1(config-if)#ip address 192.168.1.1 255.255.255.0
R1(config-if)#no shutdown
R1(Config-if)#end
R1#
R2>enable
R2#conf term
R2(config)#int serial 0/0
R2(config-if)#ip address 192.168.1.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface loopback 1
R2(config-if)#ip address 192.168.1.10 255.255.255.0
R2(config-if)#end
R2#
R1>enable
R1#ping 192.168.1.10
<you should get successful ping response>
