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contentintech© 2026

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Computer Networks

A complete networking course for interviews: OSI and TCP/IP, subnetting, routing, TCP, DNS, HTTP, TLS, and what happens when you type a URL.

1Foundations

Networking Basics~27 min read OSI and TCP/IP Models~25 min read Data Link Layer~32 min read

2Network layer

IP Addressing~26 min read Routing~25 min read

3Transport layer

TCP and UDP~27 min read TCP Flow and Congestion Control~29 min read

4Application layer and security

DNS~30 min read HTTP~30 min read Network Security~31 min read Application Protocols~28 min read

5Putting it together

URL to Page~23 min read Networking Tools~31 min read CN Interview Questions~32 min read

Your preparation pack

Free · Self-paced

14 lessons in 5 modules

Calculate transmission, propagation and queuing delays
Explain every layer of the OSI and TCP/IP models
Solve subnetting, CRC, routing and sliding-window problems
Walk through TCP, DNS, HTTP and TLS step by step
Answer "what happens when you type a URL" end to end
Answer common networking interview questions

Exercises support self-assessment. This free pack does not award a certificate or guarantee placement.