Introduction

Why Networking?

Computer networking is the foundation of the modern internet. Understanding how data travels between machines — from raw sockets to HTTP requests — is essential for every software engineer.

  • Protocols — learn how TCP, UDP, IP, HTTP, and DNS work under the hood.
  • Sockets — build client-server programs that communicate over the network.
  • Hands-on — every lesson runs real networking code in your browser.

What You Will Learn

  • How the internet protocol stack works (physical → application layer)
  • TCP connections, handshakes, and reliable delivery
  • UDP datagrams and when to use them
  • HTTP request/response lifecycle
  • DNS resolution and domain name lookups
  • Building simple network services
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