Mission Tech · Networking Zero to Hero · Path 01

Signal Path I: Browser to Server

Follow the path from browser to server. DNS, TCP, NAT, routing, Ethernet. Six regions, one mission at a time.

Before the path

One request. Four layers.

Every stop ahead works at one of these layers of the network stack. The stack is how the internet is organized: lower layers move bits, higher layers give them meaning.

  • L7 · ApplicationWhat the bytes mean. DNS and HTTP both live here.
  • L4 · TransportTCP keeps bytes in order between two endpoints.
  • L3 · NetworkIP addresses and routing between networks. Routing and NAT live here.
  • L2 · LinkMAC addresses on your local network. ARP lives here.
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