At which layer does the UDP protocol work?

The layer where the udp protocol works is the transport layer. The UDP protocol (User Datagram Protocol) is a connectionless transport protocol that provides applications with a way to send encapsulated IP packets without establishing a connection.

In the TCP/IP protocol suite, the UDP protocol works at the transport layer.

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The TCP/IP protocol is divided into 4 layers, from bottom to top, the network interface layer, the Internet layer, the transport layer and the application layer. The main function of the transport layer is to segment the user information passed by the application layer and add some additional instructions to ensure that the other party receives reliable information. There are two protocols in this layer, namely Transmission Control Protocol (TCP) and User Data Packet Protocol (UDP).

The Internet protocol set supports a connectionless transmission protocol called User Datagram Protocol (UDP, User Datagram Protocol). UDP provides a way for applications to send encapsulated IP packets without establishing a connection. RFC 768 describes UDP.

The Internet's transport layer has two main protocols that complement each other. Connectionless is UDP, which does little in particular except give applications the ability to send packets and allow them to architect their own protocols at the required level. The connection-oriented one is TCP, which does almost everything.

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