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UDP August 10, 2005

Posted by Coolguy in Networks.
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  • UDP (User Datagram Protocol) is a protocol that sends independent packets of data, called datagrams, from one computer to another with no guarantees about arrival. UDP is not connection-based like TCP.
  • The order of delivery is not important and is not guaranteed, and each message is independent of any other.
  • Eg: A clock server that sends the current time to its client when requested to do so. If the client misses a packet, it doesn’t really make sense to resend it because the time will be incorrect when the client receives it on the second try.
  • Another example of a service that doesn’t need the guarantee of a reliable channel is the ping command
  • Many firewalls and routers have been configured not to allow UDP packets
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