My networking final in high school was probably my favorite test taking experience - there was a small written portion on eg subnets, but the bulk of our grade was setting up a physical network, testing it, and leaving the room. Our teacher sabotaged three parts of our network - could be hardware, router misconfiguration, etc. when we came in we had iirc 20-ish minutes to diagnose and fix it.

The best was when she barely unscrewed one of this big DIN connectors so at quick glance it looked fine, but wasn’t fully connected.