The Network Layer

The network layer is concerned with getting packets from the source to the destination. Thus, the network layer has to know about the topology of the network; that is, how the nodes are connected together.

Packets are the unit of information of hte network layer.

Principles of the Network Layer

  • The services should be independent of the router technology.
  • The transport layer should be shielded from the number, type, and topology of the routers present.
  • The network addresses made available to the transport layer should use a uniform numbering plan, even across LANs and WANs.

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]

Transport

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