What is the purpose of UDP?

UDP is the topic for our article today. We will explore it in detail – what is its purpose, how it works, and why is it so beneficial. So, let’s start. 

UDP – what does it mean?

UDP means User Datagram Protocol. It is a well-known communications protocol that provides a high-speed solution. It is used to create low-latency and loss-tolerant connections between different Internet services.

The User Datagram Protocol speeds up the communication process by allowing data to be transferred before the receiver agrees. As a result, for time-sensitive communications such as DNS lookups, Voice over IP (VoIP), video, or audio transfers, User Datagram Protocol is the recommended alternative.

Why does DNS prefer UDP?

How does it function?

Like other communication protocols, UDP divides a message into packets or datagrams. They are then routed through the network and the machines that comprise it until they reach their destination. However, the fact that the user datagram protocol does not require a connection is a significant difference. This means that the data transfer does not need to start with a formal and active connection. This significantly accelerates the process.

UDP does not number datagrams while reassembling them after slicing messages. Instead, each datagram has a header with port numbers (from the source and destination) that are used to identify between different users’ requests when using it. The checksum function in the User Datagram Protocol ensures that the data has been transferred completely, but it does not guarantee that the messages have been received correctly.

UDP Structure

When sending data across a network, UDP needs headers to package the data. It has four fields, each of which is two bytes long. Here they are:

  • Source port number – The data-transmitting device’s port.
  • Destination port number – The port of the data-receiving device. It is a number from 0 to 65,535 bytes.
  • Length – the UDP header and any enclosed data’s length in bytes
  • Checksum – We use it to verify the packet header and payload integrity. For Internet Protocol version 4 (IPv4) is non-compulsory, but for Internet Protocol version 6 (IPv6) is obligatory.

Advantages of using UDP

UDP is extremely simple and fast. But these aren’t his only advantages. Here are the other ones:

  • UDP supports multicast if you need to broadcast information.
  • It’s suitable for the Domain Name System (DNS) because DNS queries and responses may all be carried on a single IP datagram, and DNS also has to respond to requests quickly.
  • For communication applications such as voice-over-IP or real-time, as well as online gaming, UDP is an excellent choice. In fact, UDP could be used by any application or process that can tolerate datagram loss. The decision is based on what is more important to you: rapid speed or precision, on the other hand.


In summary, UDP is a messaging protocol that allows networks and devices to communicate efficiently and quickly. It could be the ideal solution for you. When it is more or less appropriate is influenced by your personal priorities as well as the network’s requirements.

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