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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

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Stop-and-Wait, Go-Back-N, and Selective Repeat: the classic ARQ numericals

How reliable delivery actually gets implemented step by step, with the exact efficiency formulas and worked numericals for all three sliding window strategies.

11 min readUpdated 2026-09-03computer-networkstransport-layerflow-controlsliding-windowgo-back-nselective-repeat