OSI models ---Network Layer

The network layer is responsible for end to end delivery or Source to destination delivery. The Network Layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination host via one or more networks while maintaining the quality of service and error control functions.Network layer consists of seven different types of layers, these are having different type of properties and functionalities. Layers are
Physical Layer
Data Link Layer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer Its offered to OSI reference model
(Open System Interconnection model).

The common functions of the network layers are
Connection oriented and connectionless communications,
Host addressing,
Message forwarding.

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