UDP
UDP
User Datagram Protocol is a best-effort Layer 4 protocol
- UDP segments are called datagrams
- Not connection-oriented
- No connection is established before data is transmitted by the host
- Does Not provide reliable communication
- Acknowledgements are not sent, and lost segments are not retransmitted
- Segments are sent best-effort
- Does Not provide sequencing
- If sequences arrive out of order, there is no mechanism to reconstruct them in order
- Does not have flow control
- No mechanism like TCP's Window Size to control flow of traffic
- Best used for streaming video/audio content
UDP Header
Source: Wikipedia
Common protocols and ports:
Port 69, TFTP
Port 161, SNMP
Port 53, DNS