What is TCP/IP and How does it work ?

TCP (Transmission Control Protocol ) and IP (Internet Protocol ) are two distinct computer network protocols mostly used together. Due to their popularity and wide adoption, they are built in all operating systems of networked devices.

IP corresponds to the Network Layer ( Layer 3) whereas TCP corresponds to the Transport layer ( Layer 4) in OSI. TCP/IP applies to network communications where the TCP transport it used to deliver data across IP networks.
TCP/IP protocols are commonly used with other protocols such as HTTP, FTP ad SSH at application layer and Ethernet at the data link/physical layer.

Incidentally, in TCP/IP based network communication, if one layer is hacked, the other layers do not become aware of the hack and the entire communication gets compromised. Hence, there is need to employ security controls at each layer to ensure foolproof security.

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