This question evaluates a candidate's understanding of operating system and networking fundamentals, covering processes, threads and context switching, concurrency versus parallelism, TCP/UDP and flow versus congestion control, and the end-to-end web request and browser rendering pipeline.
Answer concisely but precisely. Use diagrams or bullets if it helps.
Assume a modern browser and OS; note any meaningful variants (e.g., HTTP/2 vs. HTTP/3) where relevant.
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