# Networks
All Networks notes →1 — UDP
UDP's datagram model and reliability trade-offs, and why DNS, VoIP, and gaming traffic choose it over TCP.
networks transport-layer book
2 — TCP Fundamentals
The TCP three-way handshake and four-way termination, the TCP header, sequence numbers, and ACKs that make reliable delivery possible.
networks transport-layer book
3 — Reliable Transmission
How TCP achieves reliability in practice — sliding window, flow control, congestion control, slow start, AIMD, and fast recovery.
networks transport-layer book
4 — TCP Optimization
Production TCP tuning: the Nagle algorithm, delayed ACK, keep-alive, window scaling, and TCP Fast Open.
networks transport-layer book
5 — QUIC
Why QUIC exists, what it changes by moving transport onto UDP, and how it enables HTTP/3, connection migration, and stream multiplexing.
networks transport-layer book