• It was created in the 1970s by DARPA, an agency of the United States Department of Defense.
  • This model laid the foundation for ARPANET, which was the world’s first wide area network and a predecessor of the Internet.


  • The TCP/IP Model is a specification for computer network protocols.


Layers of TCP/IP Model

  • TCP/IP is typically divided into four layers (from bottom to top) –
    • Network Interface Layer (Layer 1)
    • Internet Layer (Layer 2)
    • Transport Layer (Layer 3)
    • Application Layer (Layer 4)

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