what is OSI model

OSI MODEL

OSI stand for Open System Interconnection, OSI model represent how to way data transfer (One Network ) to (Another Network).
OSI Model also known as Reference Model.

• OSI - Open System Interconnection.
• ISO - International Standards Organization
• IEEE - Institute of Electric Electronic Engineering.  

OSI Model Layer Diagram

Every OSI model Layer Has Own Responsibility's

1. Application Layer - This layer is responsibility to access the file and check the extension of the file Ex. .txt .jpg .png .html .php etc. 
2. Presentation Layer - This layer is responsibility to Encrypt and decrypt and also compress the file and data.
3. Session Layer - This layer is responsibility to check size of file and data, Session management and error handling.
4. Transport Layer - This layer is responsibility to deliver the message from source network to destination network.
5. Network layer - This layer is responsibility to check the ip address of source network and destination network and also chose the best path for sending the data between network, with ARP (Address Resolution Protocol) send data in packet form.
6. Data-Link Layer -This layer is responsibility to check the MAC address (Media Access Control) of source network and destination network and also check LCC (Logical Link Control).
7. Physical Layer - This layer is responsibility to established the connection between source network and destination network, It can be wired and wireless.