What standard governs the establishment of network connections for data transmission?

• A. Transmission Control Protocol (TCP)
• B. User Datagram Protocol (UDP)
• C. Internet Protocol (IP)
• D. Hypertext Transfer Protocol (HTTP)

Answer: (A)

Establishing a reliable data path between two hosts is handled by a connection-oriented transport protocol. TCP does this by performing a three-way handshake (SYN, SYN-ACK, ACK) to set up a connection before any data is transmitted, then maintaining that connection to ensure data is delivered in order and without errors. It uses acknowledgments, retransmission of lost segments, and sequencing numbers to guarantee reliability, along with flow and congestion control to manage the pace of transmission. That combination—the explicit connection setup and guaranteed, ordered delivery—is what makes TCP the standard for establishing network connections for data transmission.

UDP, on the other hand, is connectionless and does not establish a persistent connection or guarantee delivery. IP handles addressing and routing, not the establishment of a connection or reliability. HTTP operates at the application layer and typically runs over TCP, but it’s the transport layer’s TCP that governs how and when a connection is established.