Understanding the Difference Between UDP and TCP in the TCP/IP Protocol Stack: A Guide to the Transport Layer

UDP and TCP belong to which layer of the TCP/IP protocol?

UDP (User Datagram Protocol) and TCP (Transmission Control Protocol) belong to the Transport layer of the TCP/IP protocol stack.

The Transport layer is responsible for the communication between two hosts or applications over an IP network. It ensures reliable and orderly delivery of data packets from the source host to the destination host.

TCP is a connection-oriented protocol, meaning it establishes a reliable and sequential connection between two hosts. It guarantees that data packets arrive in order and without errors. TCP provides features like error detection, flow control, and congestion control.

UDP, on the other hand, is a connectionless protocol. It does not establish a reliable connection before transmitting data packets. UDP is used when a reliable and ordered delivery of packets is not necessary, making it more suitable for applications like streaming media, online gaming, or DNS (Domain Name System).

Both UDP and TCP rely on the underlying IP layer for addressing and routing packets across the network. Therefore, they function on top of the network layer (IP) and are considered as part of the Transport layer in the TCP/IP protocol stack.

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