Unit 2, Transport layer recap

Three widely used transport layers:

  • TCP (reliable bi-directional byte stream), UDP(unreliable delivery of datagrams between applications), ICMP(detect when things go wrong, e.g. ping, traceroute)

  • End-to-end principle: 功能放到断点,giving mild reason and strong reason

  • How TCP builds up reliable connections:

    • data errors and missing packets
    • sliding window
    • retransmission
    • TCP finite state machine, tracks current status and transmission
      Unit 2, Transport layer recap_第1张图片

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