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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Network Layer & Routing6

Transport Layer5

Ports, and the choice between TCP and UDP
The three-way handshake and how TCP stays reliable
Stop-and-Wait, Go-Back-N, and Selective Repeat: the classic ARQ numericals
Flow control and congestion control
Sockets, where your code actually meets the network

Application Layer & The Web4

Wireless, Security & Performance3

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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Network Layer & Routing6

Transport Layer5

Ports, and the choice between TCP and UDP
The three-way handshake and how TCP stays reliable
Stop-and-Wait, Go-Back-N, and Selective Repeat: the classic ARQ numericals
Flow control and congestion control
Sockets, where your code actually meets the network

Application Layer & The Web4

Wireless, Security & Performance3

Learn Computer Networks Transport Layer

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The three-way handshake and how TCP stays reliable

Why TCP shakes hands before talking, and the sequence number math it uses to guarantee nothing gets lost or reordered.

9 min readUpdated 2026-09-03computer-networkstransport-layertcphandshake