Bits over a wire

The TCP/IP model is a reference models of networking which was invented by the Department of Defense in the 1960 s. Its comprised of 4 layers.

• Application Layer - Manages how information is sent.
• Level 3- Transport Layer - Responsible for ensuring data is not lost when it is sent .
• Level 2- Network Layer (Internet Layer) - Responsible for routing packets over the entire network.
• Level 1- Network Access Layer (Link Layer) - Deals with how bits are sent on a wire or transmitted through the air waves, as well as the detecting and correction of errors.

Number 2The OSI Model

The Open Systems Interconnection model (OSI model) is a reference model from the International Organization for Standardization (ISO) that provides a common basis for the coordination of standards development for the purpose of systems interconnection. [2] In the OSI reference model, the communications between systems are split into seven different abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.[3]

Number 3 The OSI Model

The Open Systems Interconnection model (OSI model) is a reference model from the International Organization for Standardization (ISO) that provides a common basis for the coordination of standards development for the purpose of systems interconnection. [2] In the OSI reference model, the communications between systems are split into seven different abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.[3]