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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Network Layer & Routing6

Transport Layer5

Application Layer & The Web4

DNS, the internet's phonebook
HTTP, and everything that happens when you load a webpage
FTP, and why file transfer got its own dedicated protocol
Email and the other quiet protocols running the internet

Wireless, Security & Performance3

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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Network Layer & Routing6

Transport Layer5

Application Layer & The Web4

DNS, the internet's phonebook
HTTP, and everything that happens when you load a webpage
FTP, and why file transfer got its own dedicated protocol
Email and the other quiet protocols running the internet

Wireless, Security & Performance3

Learn Computer Networks Application Layer & The Web

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Email and the other quiet protocols running the internet

How email actually travels between providers, and a tour of the other application-layer protocols working behind the scenes.

7 min readUpdated 2026-09-03computer-networksapplication-layeremailsmtp