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Editor's pickDiagnose a website that works on one network but not another. Compare DNS, IPv4 and IPv6, TLS, caching, and connectivity with a practical workflow.
Learn to capture authorized lab traffic in Wireshark, filter DNS and TCP packets, recognize TLS handshakes, and understand what HTTPS encryption hides.
Follow a browser navigation from URL parsing and DNS to TLS, HTTP, caching, and rendering, with notes on HTTP/3 and modern browser optimizations.