What is TCP/IP on the Internet? Discuss about TCP/IP on the Internet.

TCP/IP on the Internet:-

TCP/IP is the widely accepted protocol used in the networks. It is a protocol suite that consists of several protocols including two primary protocols, Transmission Control Protocol (TCP) and Internet Protocol (IP). The TCP/IP Protocol (protocol program) works asynchronously to handle multiple message traffic simultaneously from multiple sources to multiple destinations as shown in Figure 1.4. TCP (TCP Protocol program) handles the data integrity. It makes sure data gets to the destination without errors. TCP is also responsible for disassembling and assembling the data. It divides large messages into smaller packets of at the most 15 KB size. Each of this packet is called a segment. TCP numbers these segments and hands over to the IP. IP is the Protocol (protocol program) that controls how data moves around on the network. After TCP divides the message into segment, IP labels them with source and destination. These packets are now called IP Datagrams. IP also takes care of sending the datagrams by determining the route. These datagrams may hop several networks before reaching the destination.





At the destination the IP verifies the labels and passes them to the TCP. The TCP (at the destination) checks if all the segments have been received. If any of the segments are missing it informs this to the source TCP and requests the segment to be sent again. It is called retry. After verification, the TCP assembles the message from these data segments and supplies to the destination program.