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📘 The internet moves data in labeled packets

Messages split into packets that travel independently and reassemble at the destination.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Packets and layersExplain packets, layering, TCP versus UDP, and IP addressing.Data travels in layered packets with addresses and transport contracts.
  2. Routing and DNSDescribe routing, DNS resolution, HTTPS, and NAT.BGP moves packets between networks; DNS names targets; TLS encrypts apps.
  3. Apps, access, and limitsConnect apps, last-mile access, filtering, and simple tracing tools.Apps ride the same core; outages and policy often localize to paths or names.

Questions this course answers

Why does the internet use packets?

Packet switching interleaves traffic and reroutes around failures.

What is DNS primarily for?

DNS resolves human-readable names to addresses other protocols use.

What does HTTPS add to HTTP?

TLS protects data in transit and verifies server certificates against trusted roots.

Why can one app outage look like the internet is down?

Application or DNS failures differ from core connectivity loss.

Grounded in trusted sources

  • Internet Engineering Task Force, RFC overview — https://www.ietf.org/standards/rfcs/
  • Cloudflare Learning Center, DNS — https://www.cloudflare.com/learning/dns/what-is-dns/
  • National Institute of Standards and Technology, TLS guidance — https://csrc.nist.gov/projects/cryptographic-standards-and-guidelines
  • Wikipedia, Internet protocol suite — https://en.wikipedia.org/wiki/Internet_protocol_suite

Every Wunder lesson is built from real, reputable sources — never invented.

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