User Datagram Protocol (UDP)

1
User Datagram Protocol (UDP)
2
UDP

• Connectionless services
• No reliability checks (sequencing/acks)
• Some apps
• Network monitoring
• DNS name resolution
• Streaming audio video

3
Frame format

• Source Port/Destination Port A port
  (socket/session) Virtual circuit between two
  communicating processes on two different
  computers or devices
• The source port is the port on the sending
  device.
• The destination port is a TCP port on a receiving
  device that corresponds with the source port on
  the sending device
• Length contains information about the length of
  the frame
• Checksum The checksum is a 16-bit cyclic
  redundancy check (CRC) that is computed by adding
  the length of all header fields plus the length
  of the data payload field (the sum of all fields
  in the TCP segment).
• Placed in the frame by the sending station.
• The recipient also calculates the checksum and
  compares its calculation with the value in the
  checksum field.