UDP: more

• often used for streaming multimedia apps

  • loss tolerant
  • rate sensitive

• other UDP uses (why?):

  • DNS
  • SNMP

• reliable transfer over UDP: add reliability at application layer

  • application-specific error recover!

source port #

dest port #

32 bits

Application

data

(message)

UDP segment format

length

checksum

Length, in

bytes of UDP

segment,

including

header

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