Which protocol is considered connection-oriented and reliable?

The selected answer, TCP, stands out as a connection-oriented and reliable protocol due to its design and functionality in network communications. TCP, or Transmission Control Protocol, establishes a connection between sender and receiver before any data is transmitted, ensuring that the data flow is organized and reliably delivered.

One of the hallmark features of TCP is its mechanism for error-checking and recovery. It breaks data into segments and sends them, ensuring each segment is accounted for. If any segments are lost in transmission, TCP employs retransmission strategies to ensure that all data arrives intact at the destination. Furthermore, TCP uses sequence numbers to maintain the correct order of packets, which is crucial for applications that require data integrity and correct sequencing.

In contrast, the other protocols mentioned do not offer the same level of reliability or connection management. UDP (User Datagram Protocol) is connectionless and does not guarantee delivery, order, or error checking, making it faster but less reliable. FTP (File Transfer Protocol) does rely on TCP for transferring files, which does make FTP a reliable protocol, but it is not the fundamental protocol considered for connection-oriented characteristics. TFTP (Trivial File Transfer Protocol) is also based on UDP and thus shares its lack of reliability and connection orientation.

TCP's design