The Unplugged Host

Lesson 19 of 35 in Coddy's LAN Labs course.

From here on you inherit labs that someone else broke. The method never changes: reproduce the complaint with a ping, read the reason, look at the relevant view (show, show ip, show routes), fix one thing, and ping again.

The oldest fault in networking is a loose cable. In the lab it shows up as a device whose LINKS column reads -, and as a ping that dies at the last hop with the exact interface that leads nowhere.

Challenge

Easy

Users on pc1 report that the server pc3 is down. Ping pc3 from pc1, show the lab, reconnect the missing cable between r1 and pc3, and ping again.

Expected output:

pc1 -> pc3: unreachable (r1 eth1 is not connected to anything)
NODE  TYPE    LINKS
pc1   host    sw1
pc2   host    sw1
pc3   host    -
r1    router  sw1
sw1   switch  pc1, pc2, r1
Linked r1 (eth1) <-> pc3 (eth0)
pc1 -> pc3: reply from 10.0.0.20 (ttl=63, via r1)

Try it yourself

Terminal