Which statement correctly describes a primary transport protocol that guarantees data delivery through connection-oriented communication?

Which statement correctly describes a primary transport protocol that guarantees data delivery through connection-oriented communication?

• A. TCP is connection-oriented and guarantees delivery
• B. UDP is connection-oriented and guarantees delivery
• C. TCP is connectionless and does not guarantee delivery
• D. UDP is connectionless and guarantees delivery

Answer: (A)

The main idea is that reliable delivery comes from a connection-oriented transport. TCP establishes a connection with a three-way handshake, then uses sequence numbers, acknowledgments, and retransmissions to ensure every byte is delivered and in the correct order. It also employs flow control and congestion control to regulate how fast data is sent. UDP, by contrast, is connectionless and offers no reliability guarantees, sending data as best effort without retransmission or ordering. So describing TCP as connection-oriented and guaranteeing delivery best captures how this protocol provides reliable communication.

The main idea is that reliable delivery comes from a connection-oriented transport. TCP establishes a connection with a three-way handshake, then uses sequence numbers, acknowledgments, and retransmissions to ensure every byte is delivered and in the correct order. It also employs flow control and congestion control to regulate how fast data is sent. UDP, by contrast, is connectionless and offers no reliability guarantees, sending data as best effort without retransmission or ordering. So describing TCP as connection-oriented and guaranteeing delivery best captures how this protocol provides reliable communication.