The 4 Layer Internet Model

  • Application: Bi-directional reliable byte stream between two applications, using application-specific semantics
  • Transport: Guarantees correct, in-order delivery of data end-to-end. Controls congestion.
  • Network: Delivers datagrams end-to-end. Best-effort delivery - no guarantees. Must use the Internet Protocol (IP)
  • Link: Delivers data over a single link between an end host and router, or between routers.

Reuse is a big advantage of layering. Each layer provieds a service to above.

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