UDP

User Datagram Protocol

Feature

• Connectionless, unreliable
• Unicast and multicast
• Datagram oriented

UDP Format

• Port numbers
  • Identify sending and receiving applications (processes). The maximum value for a port number is 216-1= 65535
  • 1-1023: Well-known, used by servers, fixed
  • 1024-49151: Registered, used by ordinary user processes
  • $>$49151: Dynamic/private, used by clients, randomly picked