Simple definition
UDP prefers speed and does not systematically check that each data has arrived.
Technical definition
The datagram protocol does not include acknowledgement, re-ordering or retransmission, and these functions must be performed by the application when required.
What is it used for ?
DNS, voice over IP, streaming, online games and other time-sensitive uses.
Practical example
A telephone conversation can tolerate the loss of a small audio package rather than waiting for it to be retransmitted.
Common issues
- Loss of packages difficult to detect
- Flow blocked by the firewall
- NAT ex-pirating rapidly
- Quality degraded by latency or gyke
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.