IN

How the Internet Works

beginner

From typing a URL to pixels on screen.

You type a URL and a page appears half a second later — after your request crossed continents, touched a dozen machines, and got reassembled from packets that each found their own route. Every web developer stands on this machinery. This track walks the whole journey: DNS, TCP/IP, HTTP, TLS, and what browsers actually do.

Web DevelopmentAPIsDebuggingDevOpsInterviews
0%
0/7 lessons

Setup

Concepts track — nothing to install. These built-in tools let you watch each layer work; every lesson uses one or two.

Bash
# All built in (PowerShell):
nslookup example.com        # DNS lookups
ping example.com            # reachability + latency
tracert example.com         # the route your packets take
curl.exe -v https://example.com   # raw HTTP conversation

Lessons

1
The Big Picture: Packets & Layers
The internet's founding trick: chop every message into small packets, let each o…
→
2
IP Addresses & Routing
Every machine on the internet has an address. How your laptop — with its private…
→
3
DNS — The Internet's Phone Book
Computers route by number; humans remember names. DNS translates example.com int…
→
4
TCP & UDP — Reliable vs Fast
IP delivers packets 'best effort' — they can vanish, duplicate, or arrive shuffl…
→
5
HTTP & HTTPS
Above all the plumbing sits a plain-text conversation: 'GET /page' — '200 OK, he…
→
6
The Full Journey: URL to Pixels
Everything assembled: type example.com, press Enter, and watch every layer from …
→
7
Internet Cheatsheet
Layers, ports, status codes, and debug commands — one page.
→