W4 L2 - UDP

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5 Terms

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Transport layer actions

Sender:

  • Passed application layer message

  • Determines segment header fields values

  • Creates segment

  • Passes segment to IP

Receiver:

  • Receives segment from IP

  • Checks header values

  • Extracts application-layer message

  • Demultiplexes message up to application via socket

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Multiplexing

As sender:

Handle data from multiple sockets, add transport header

As receiver:

Use header info to deliver received segments to correct socketlv

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TCP vs UDP

TCP:

  • Reliable, in order

  • Congestion control

UDP:

  • Unreliable, unordered

  • Fast

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UDP

  • Connectionless

    • No handshake between sender and receiver (reduced RTT)

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Checksum

Goal: Detect errors