How the web works, at PM depth

#Why this question keeps coming up

"What happens when you type a URL into a browser and press Enter?" is the most common technical question PMs get, and it is popular for a good reason. One question shows whether you have a mental model of clients, servers, networks and data. It also gives the interviewer a dozen places to ask "and what if that's slow?"

You do not need every detail engineers know. You need the main steps, in order, each described correctly, plus a sense of where time and failure come from.