TCP is one of the main protocols in TCP/IP networks. TCP/IP was developed in the 1970s and adopted as the protocol standard for ARPANET (the predecessor to the Internet) in 1983.Whereas the IP protocol deals only with packets. TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and also guarantees that packets will be delivered in the same order in which they were sent.It is a popular network debugging tool used to intercept and display packets transmitted or received on a network.TCPdump is one of those tools that network and systems administrators alike reach for whenever they need to take a look at the actual network packets. The TCP/IP suite provides two transport methods and also ensures that data arrive intact and complete. It is used for everything that must arrive in perfect form.
The TCP transport layer 4 sends packets to IP network layer 3, which adds its own header and delivers a "datagram" to a data link layer 2 protocol such as Ethernet, ATM or SONET. Datagram is the unit of data or packet, transmitted in a TCP/IP network. Each datagram contains source and destination addresses and data.
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