Configuring serial connections between routers for WAN connections is a basic task that you’ll need to be proficient at in order to pass the CCNA exam. In this exercise, you’ll demonstrate the ability to successfully configure a serial connection between two routers that are directly connected.
Two routers are connected back-to-back via Serial interfaces (the interface numbers may vary in your environment), as shown in the following diagram:
Erase any existing startup configurations and reload the devices before proceeding.
Set the hostname of the first router to “R1″.
Configure R1′s Serial 0/0 interface with the IP address 172.16.12.1 and subnet mask 255.255.255.252.
Configure R1 as a DCE device with a clock rate of 128000.
Enable R1′s Serial 0/0 interface.
Set the hostname of the second router to “R2″.
Configure R2′s Serial 0/0 interface with the IP address 172.16.12.2 and subnet mask 255.255.255.252.
Enable R2′s Serial 0/0 interface.
Using the ping command on the R1 router, verify that you can ping the R2 router.
Using the ping command on the R2 router, verify that you can ping the R1 router.