User Datagram Protocol (UDP)
- Source Port
- Destination Port
- Length
- Checksum
- Payload
68 is usually client, 67 is usually server
For reliable networks (like local) where out-of-order protections of TCP are unnecessary, or for time sensitive applications (e.g. streams or calls) where lossy transmission at high speed is better than quality transmission at choppy speed.
Segment Format
- Source Port (16 bits)
- Destination Port (16 bits)
- Length in bytes, including header (16 bits)
- Checksum (16 bits)
- Application Data