In which OSI layer is UDP categorized?

In which OSI layer is UDP categorized?

• A. Transport Layer (Layer 4)
• B. Network Layer (Layer 3)
• C. Data Link Layer (Layer 2)
• D. Session Layer (Layer 5)

Answer: (A)

UDP sits in the Transport Layer, which is Layer 4 of the OSI model. The transport layer is where end-to-end communication between processes is handled, using ports to multiplex multiple conversations over the same network address. UDP is a connectionless datagram protocol, sending individual packets without establishing a connection and without guaranteeing delivery, order, or protection against duplicates. Those traits—low overhead, no handshake, and no reliability guarantees—are hallmarks of transport-layer design aimed at speed and simplicity, setting UDP apart from the networks and framing responsibilities of lower layers like the Network and Data Link layers, or the session-management focus of the Session layer. So UDP is categorized as a Transport Layer protocol.

UDP sits in the Transport Layer, which is Layer 4 of the OSI model. The transport layer is where end-to-end communication between processes is handled, using ports to multiplex multiple conversations over the same network address. UDP is a connectionless datagram protocol, sending individual packets without establishing a connection and without guaranteeing delivery, order, or protection against duplicates. Those traits—low overhead, no handshake, and no reliability guarantees—are hallmarks of transport-layer design aimed at speed and simplicity, setting UDP apart from the networks and framing responsibilities of lower layers like the Network and Data Link layers, or the session-management focus of the Session layer. So UDP is categorized as a Transport Layer protocol.