Visiting a Website (end to end)
Medium+15 XPThe whole trip in one animation: DNS → handshake → TLS → GET → 200 OK. Every networking idea, fired in order.
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Watch
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Press Run to begin.
This is the capstone — everything you've learned, running as one sequence. You type example.com and press enter; five steps fire in order to put the page on your screen. Press Run and watch the whole journey: find the address, open the connection, lock it, ask, receive.
▸Why so many steps just to load one page?
Each step solves a different problem. DNS finds WHERE the server is. The TCP handshake makes sure it's listening and the connection is reliable. TLS makes the connection PRIVATE. Only then does the HTTP request actually ASK for the page. They're layered on purpose — each one trusts the step before it.
▸Does all of this really happen every time?
The full sequence happens on the first visit. After that, computers cache and reuse: DNS answers are remembered, and one open connection carries many requests, so you skip repeat handshakes. That's why the first load of a site feels a touch slower than the ones after it.
▸What could go wrong, and what would I see?
Each step has its own failure. DNS fails → 'server not found.' The connection won't open → it times out. TLS can't verify the certificate → a 'not secure' warning. The server replies with an error → a 404 (page missing) or 500 (server broke). The step that fails tells you what went wrong.
▸Where do packets and routing fit in?
Underneath all of it. Every message here — the DNS query, the handshake, the GET, the page coming back — is chopped into packets that hop router to router across the internet and get reassembled. This animation shows the big steps; packets are the tiny couriers carrying each one.