Institution: Bangladesh Development Bank Exam: Bangladesh Development Bank Ltd - Officer - 28.03.2014
Topic: ICT (তথ্য ও যোগাযোগ প্রযুক্তি), Subject: Computer and ICT (তথ্য ও যোগাযোগ প্রযুক্তি)

Best Answer Explained in Below-:

The correct answer is A) TCP, which stands for Transmission Control Protocol. TCP is a core protocol of the Internet Protocol Suite, responsible for establishing a reliable connection-oriented service for message transmission between devices over a network.

TCP is designed to ensure that data packets are delivered accurately and in the correct order. It achieves this reliability through several key mechanisms, including error detection, retransmission of lost packets, and flow control. When a TCP connection is established, a three-way handshake is performed to create a reliable channel between the sender and receiver.

In contrast, Option B) IP (Internet Protocol) is primarily responsible for addressing and routing packets but does not guarantee reliable delivery; it operates in a connectionless manner. Option C) UDP (User Datagram Protocol) also fails to provide reliability features, prioritizing speed over accuracy, which makes it suitable for applications like video streaming or online gaming, where speed is more critical than perfect data delivery. Therefore, TCP is the protocol that provides a reliable, connection-oriented service for delivering messages, making it the correct choice for the given question.