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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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How bits become wires, light, and radio waves

What is physically happening inside a cable or through the air when a computer sends a 0 or a 1.

8 min readUpdated 2026-09-03computer-networksphysical-layersignals