OSI Model in Network (Open System Interconnection)

Seven layers of OSI Model

1 Physical : - Physical layer deals with bit-level transmission between different devices and supports electrical or mechanical interfaces connecting to the physical medium for synchronized communication.

2 Data Link : - Data Link layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.

3 Network : - Network layer that provides data routing paths for network communication. Data is transferred in the form of packets via logical network paths in an ordered format controlled by the network layer.

4 Transport : - The transport layer is a conceptual division of methods in the layered architecture of protocols in the network. The protocols of the layer provide host-to-host communication services for applications.

5 Session : - The session layer provides the mechanism for opening, closing and managing a session between end-user application processes, i.e., a semi-permanent dialogue.

6 Presentation : - The presentation layer is layer 6 and serves as the data translator for the network. It is sometimes called the syntax layer.

7 Application : - The Application  consists of protocols that focus on process-to-process communication across an IP network and provides a firm communication interface and end-user services.