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🌐 How does the internet actually work

Packets, IP, DNS, and the layered mesh of networks that makes a webpage appear.

3
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Packets on a Global RelayExplain packet switching, IP, routing hops, and DNS.The internet moves labeled packets across independently owned networks. Addresses guide hops; DNS translates names people use into numbers machines route.
  2. Layers That CooperateSeparate link/IP/transport/app roles and introduce TCP, TLS, and CDNs.Layers divide the problem. TCP and UDP serve different apps; HTTPS encrypts web traffic; CDNs shorten the trip for popular content.
  3. Who Owns the RoadsDescribe ISPs, peering, congestion queues, and resilient routing.Business relationships and capacity shape paths. Congestion is queues and drops; redundancy keeps the global mesh usable when parts fail.

Questions this course answers

What problem does DNS primarily solve for everyday users?

DNS resolves domain names into the IP addresses routers need to deliver packets.

Match each layer-ish job to the better fit.

IP routes, TCP (often) makes transport reliable, TLS protects the web session.

Order a simplified path for loading a website.

Name → connect → fetch → render is the everyday happy path (CDNs may answer as the nearby server).

Grounded in trusted sources

  • Internet Society — how the internet works explainers
  • IETF — RFCs for IP, TCP, and related architecture (overview level)
  • ICANN / IANA — DNS and addressing stewardship context
  • Cloudflare / academic CDN primers on edge caching (educational)

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

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