Why TCP is called connection-oriented and reliable protocol? Differentiate TCP with UDP.

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Suresh Chand · Accepted Answer

TCP is a connection-oriented protocol because it requires a logical connection to be established between the two processes before data is exchanged. The connection must be maintained during the entire time that communication is taking place, then released next. Connection-oriented transport means any data remaining in the buffer is sent before the connection is terminated. The release is accomplished in a three-way handshake between client and server processes. TCP provides for the recovery of segments that get lost, are damaged, duplicated, or received out of their correct order. TCP is described as a 'reliable' protocol because it attempts to recover from these errors. The difference between TCP and UDP is TCP UDP It is a connection-oriented protocol. It is a connectionless protocol. TCP reads data as streams of bytes, and the message is transmitted to segment boundaries. UDP messages contain packets that were sent one by one. It also checks for integrity at the arrival time. TCP messages make their way across the internet from one computer to another. It is not connection-based, so one program can send lots of packets to another. TCP rearranges data packets in a specific order. UDP protocol has no fixed order because all packets are independent of each other. The speed for TCP is slower. UDP is faster as error recovery is not attempted. The header size is 20 bytes The header size is 8 bytes. TCP is heavy-weight. TCP needs three packets to set up a socket connection before any user data can be sent. UDP is lightweight. There are no tracking connections, ordering of messages, etc. TCP does error checking and also makes error recovery. UDP performs error checking, but it discards erroneous packets. Acknowledgment segments No Acknowledgment segments Using handshake protocols like SYN, SYN-ACK, ACK No handshake (so connectionless protocol) TCP is reliable as it guarantees the delivery of data to the destination router. The delivery of data to the destination can’t be guaranteed in UDP. TCP offers extensive error-checking mechanisms because it provides flow control and acknowledgment of data. UDP has just a single error checking mechanism which is used for checksums.

Why TCP is called a connection-oriented and reliable protocol? Differentiate TCP with UDP.

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Why TCP is called a connection-oriented and reliable protocol? Differentiate TCP with UDP.

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