OSI MODEL

OSI stand for open systems interconnection or OSI model was first proposed by international standard organization (ISO) to solve the multiple problems faced in telecommunication. It is conceptual model of telecommunication networking where the whole process is divided into seven effective layers. The 7 OSI model layers are:-

1- Physical layer
2- Data link layer
3- Network layer 
4- Transport layer
5- Session layer
6- Presentation layer
7- Application layer