Networking

How a packet gets there, what goes wrong with HTTP, and how to diagnose a connection that fails intermittently. Three courses, 30 lessons.

One-off purchase, no subscription. Pay once, it never expires.

What's included

• 01Networking FundamentalsAddresses, routing, ports, TCP and UDP, DNS and its caches, TLS and certificate errors — and a method for turning «it doesn't connect» into a question you can answer.10 lessons · ~81 min
• 02HTTP in PracticeStatus codes that lie, caching, cookies and sessions, CORS, redirect loops, proxies and what HTTP/2 and HTTP/3 did and did not change.10 lessons · ~84 min
• 03Networking TroubleshootingWhere the time goes, latency against bandwidth, MTU black holes, keepalives, packet loss, tcpdump and reading a capture, exhausted connections and intermittent failures.10 lessons · ~88 min