Which of the following is an example of a Transport Layer protocol?

The User Datagram Protocol (UDP) is indeed an example of a Transport Layer protocol. The Transport Layer is responsible for end-to-end communication, data flow control, and error handling between hosts on a network. UDP specifically facilitates a connectionless communication model where data is sent without establishing a prior connection, making it suitable for applications that require fast data transmission with minimal overhead, such as video streaming or online gaming.

In contrast, other protocols mentioned serve different layers or purposes. File Transfer Protocol (FTP) and Hypertext Transfer Protocol (HTTP) are both classified under the Application Layer, which focuses on end-user applications and data presentation. They provide higher-level functionalities for file transfers and web communications, respectively. Internet Control Message Protocol (ICMP), on the other hand, operates at the Network Layer and is primarily used for diagnostic and error reporting functions within IP networks, such as determining reachability or informing about packet loss. Thus, UDP's role and functionality place it clearly within the Transport Layer category.