The objective of this lab exercise is for you to learn and understand how to create and troubleshoot IPv4 addresses on Cisco routers.
Configuring IPv4 addressing is one of your most fundamental tasks as a Cisco engineer. In the exam, you may also be asked to troubleshoot IPv4 addressing that has already been configured but incorrectly, so you need to know which show commands to use.
This lab is suitable for CCENT certification exam preparation.
This lab has a difficulty rating of 2/10.
When you are ready for your certification exam, you should complete this lab in no more than 10 minutes.
Please use the following topology to complete this lab exercise:
Configure the hostnames on routers R1 and R3 as illustrated in the topology.
Configure R1 S0/0, which is a DCE, to provide a clock rate of 768 Kbps to R3 (unless you are using GNS3). Configure the IP addresses on the Serial interfaces of R1 and R3 as illustrated in the topology. Configure the Loopback interfaces specified in the diagram on R1 and R3.
Use the correct show commands to check:
- The summary of all configured IP addresses;
- The status of the interface (up/down or administratively down); and
- The subnet mask applied to the interface.
Configuration and Verification
Router#config t Enter configuration commands, one per line. End with CTRL/Z. Router(config)#hostname R1 Router#config t Enter configuration commands, one per line. End with CTRL/Z. Router(config)#hostname R3 R3(config)#
R1(config)#interface s0/0 R1(config-if)#ip add 172.16.1.1 255.255.255.192 R1(config-if)#no shut R3(config)#interface s0/0 R3(config-if)#ip add 172.16.1.2 255.255.255.192 R3(config-if)#no shut R3(config)#interface lo10 R3(config-if)#ip add 10.10.10.3 255.255.255.128 R3(config)#interface lo20 R3(config-if)#ip add 10.20.20.3 255.255.255.240 R3(config)#interface lo30 R3(config-if)#ip add 10.30.30.3 255.255.255.248
R3#show ip int brie Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset administratively down down Serial0/0 172.16.1.2 YES manual up up Loopback10 10.10.10.3 YES manual up up Loopback20 10.20.20.3 YES manual up up Loopback30 10.30.30.3 ES manual up up R3#show interface s0/0 Serial0/0 is up, line protocol is up Hardware is GT96K Serial Internet address is 172.16.1.2/26 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set