Welcome to the NetSimLab blog

This blog covers two things we spend a lot of time on:

Testing network changes before production. Modeling a change in a simulated network, checking how it behaves, and going into the maintenance window with fewer surprises.
Certification study. Building practice labs for exam objectives, then breaking and fixing them until the concepts stick.

Expect configuration snippets, topology walkthroughs and lab writeups. For example:

router ospf 1
 network 10.0.12.0 0.0.0.255 area 0
 passive-interface default
 no passive-interface GigabitEthernet0/1

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