Survey the Damage

Lesson 32 of 35 in Coddy's LAN Labs course.

A branch office network was set up by a contractor who left in a hurry. Two floors (192.168.10.0/24 behind switch s1, 192.168.20.0/24 behind s2) hang off router br, and users on both floors complain.

Before touching anything, survey: show for the wiring, check for everything the configuration itself gives away. Read every line; the check will hand you most of the fault list, and the rest you will find by pinging in the next lessons.

Challenge

Easy

Show the lab, then run the check.

Expected output:

NODE  TYPE    LINKS
br    router  s1, s2
h1    host    s1
h2    host    s1
h3    host    s2
h4    host    s2
h5    host    s2
s1    switch  br, h1, h2
s2    switch  br, h3, h4, h5
WARN  h4: no gateway (cannot reach other subnets)
ERROR 192.168.20.11 is used by h3 and h5
WARN  br and h2 share a segment but use different masks (255.255.255.0 vs 255.255.255.128)
WARN  h1 and h2 share a segment but use different masks (255.255.255.0 vs 255.255.255.128)
Lab check: 4 problem(s) found

Try it yourself

Terminal