E-Lab 9.2.5 - Layer 3 Troubleshooting using ping In this lab, the students will use the ping command to send an ICMP echo request to an adjacent router. The ping will verify that the link and line protocol over which the ping travels are up and able to send and receive data. Step 1 Login to the router in privileged EXEC mode. Step 2 Issue a standard ping to the Serial 0/0 interface on the Bratislava router.