Last week's network problem
12.1: End-to-End Principle
12.2: TCP Header
12.3: Connection establishment
12.6: TCP state diagram
12.7: Old duplicates
12.8: TimeWait
12.9: The Three-Way Handshake Revisited
12.10 Anomalous TCP scenarios
12.11 TCP Faster Opening
12.12 Path MTU Discovery
12.13 TCP Sliding Windows
12.14 TCP Delayed ACKs