Your question is Explaining Network Fundamentals Under Pressure. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you had to quickly come up to speed on basic networking concepts—like subnets, VLANs, routing, or packet flow—and then explain them clearly to solve a security problem or help a team make a decision. What did you do, and what was the outcome?