Which protocol operates at the Transport layer of the TCP/IP model?

Which protocol operates at the Transport layer of the TCP/IP model?

• A. Ethernet
• B. TCP
• C. HTTP
• D. IPv4

Answer: (B)

Understanding the layers helps: the Transport layer is responsible for end-to-end communication between applications, offering features like reliable delivery, sequencing, and port-based multiplexing. The protocol in this set that operates at the Transport layer is TCP. TCP provides a connection-oriented, reliable stream of data between hosts, with mechanisms such as a three-way handshake to establish a connection, acknowledgments, retransmission of missing data, and flow control. Other options map to different layers: Ethernet is a data link protocol used for framing on local networks; IPv4 is a network layer protocol that handles addressing and routing; HTTP is an application-layer protocol that uses transport-layer services (most commonly TCP) to deliver its messages.

Understanding the layers helps: the Transport layer is responsible for end-to-end communication between applications, offering features like reliable delivery, sequencing, and port-based multiplexing. The protocol in this set that operates at the Transport layer is TCP. TCP provides a connection-oriented, reliable stream of data between hosts, with mechanisms such as a three-way handshake to establish a connection, acknowledgments, retransmission of missing data, and flow control.

Other options map to different layers: Ethernet is a data link protocol used for framing on local networks; IPv4 is a network layer protocol that handles addressing and routing; HTTP is an application-layer protocol that uses transport-layer services (most commonly TCP) to deliver its messages.