UDP: User datagram Protocol [RFC 768 口“ no frills"" bare bones" Internet transport Why is there a UDP? protocol o no connection 0" best effort"service, UDP establishment(which can segments may be add delay o lost g simple: no connection state o delivered out of order at sender receiver to app 口sma| segment header g connectionless g no congestion control: UDP o no handshaking between can blast away as fast as UDP sender receiver desired o each UDP segment handled independently of others 3: Transport Layer 3a-73: Transport Layer 3a-7 UDP: User Datagram Protocol [RFC 768]  “no frills,” “bare bones” Internet transport protocol  “best effort” service, UDP segments may be:  lost  delivered out of order to app  connectionless:  no handshaking between UDP sender, receiver  each UDP segment handled independently of others Why is there a UDP?  no connection establishment (which can add delay)  simple: no connection state at sender, receiver  small segment header  no congestion control: UDP can blast away as fast as desired