UDP Full Form | Full Form of UDP




UDP Full Form - User Datagram Protocol

  • UDP stands for User Datagram Protocol. It’s a Transport Layer Protocol, which is a part of the internet Protocol Suite and an alternate communication protocol to Transmission Control Protocol (TCP).
  • Both UDP and TCP are transparent layers protocols which are used on the internet or run on the highest of the internet Protocol (IP) and commonly called UDP/IP and TCP/IP, respectively.
  • Out of those two, the UDP is the simplest transport layer protocol designed to send data over the web.
  • It picks the datagram from the network layer and attaches the header then forwards it to the user.
 User Datagram Protocol

User Datagram Protocol

Characteristics of UDP

  • It’s a quick, unreliable, and stateless protocol that produces it suitable for use with applications that may tolerate lost data.
  • It will be used for transaction-based protocols, like DNS or Network Time Protocol NTP.
  • It are often used for settings where many clients are connected and where real-time error correction isn't must, like gaming, voice calls, or video conferencing, and streaming videos.
  • It's a connectionless protocol as it doesn’t need a virtual circuit before transferring the data.
  • It offers minimal transport service, in-order delivery isn't certain, and a congestion control mechanism is additionally not provided.
  • Furthermore, UDP uses headers to transfer data over connections. Its headers contain a collection of parameters called fields. A UDP header has four fields which are as follows:
    • Source Port : It's a 2 Byte field that tells the port number of a source.
    • Destination Port : It's also a 2 Byte long filed that tells the port number of the destination.
    • Length : It's the overall length of the UDP, including the header and also the data. It’s a 16-bits field.
    • Checksum : It's a 2 Byte long field that's used to check errors, e.g., it's used in IPv6 and sometimes in IPv4.
 User Datagram Protocol

User Datagram Protocol

How UDP Works

  • UDP sends a datagram (data unit) from one computer to a different using the internet Protocol.
  • UDP encapsulates the data during a UDP packet and adds its header information to the packet.
  • The data comprises source port, destination port, the packet length, and a checksum. After the UPD packets are encapsulated in an internet Protocol packet, they start moving to their destinations.

Applications of UDP

  • It's used for easy request-response communication where data is a smaller amount and which require one response for one request, and not much concerned with flow and error control. e.g., DNS
  • UDP are often used for multicasting as it supports packet switching.
  • It are often used by routing protocols like RIP and OSPF as they transmit less data.
  • It's used by Trivial File Transfer Protocol (TFTP) to send small files.
  • It's used by multicasting and broadcasting applications.
  • It will be used by streaming media like video conferencing as like speed over reliability.
  • Chatting, online games, and similar real-time applications use UDP.
  • Management protocols like SNMP (Simple Network Management Protocol), and Bootp or DHCP also use UDP.
  • Furthermore, there are various protocols that use UDP, like Kerberos, Network Time Protocol (NTP), Network News Protocol (NNP), etc.


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