This question exists because it tests whether you can connect DNS, ARP, TCP, TLS, HTTP and rendering into one ordered flow. Reach for it in any interview that says "walk me through" a web request, and when you debug a slow page and need to know which step is slow. Go in order and name the protocol at each step instead of jumping straight to the server. Depth beats breadth here; a clear sequence with correct ports impresses more than a list of buzzwords.