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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

How bits become wires, light, and radio waves
Bandwidth, latency, and throughput
Noise, errors, and how we catch them

Data Link Layer6

Network Layer & Routing6

Transport Layer5

Application Layer & The Web4

Wireless, Security & Performance3

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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

How bits become wires, light, and radio waves
Bandwidth, latency, and throughput
Noise, errors, and how we catch them

Data Link Layer6

Network Layer & Routing6

Transport Layer5

Application Layer & The Web4

Wireless, Security & Performance3

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Noise, errors, and how we catch them

Why bits flip during transmission, and the simple math (parity and checksums) used to catch it before it causes real damage.

11 min readUpdated 2026-09-03computer-networksphysical-layererror-detectionchecksums