Today we study the OSI model which is very important it provide the conceptual understanding in the internet networking.The OSI model have seven layers which perform different function the detail are below.
It describes the electrical/optical .mechanical and functional interference through physical medium, and carries the signals to all higher layers.It use for data encoding like convert the pattern 0 and 1.It used to connect the mediums and define how many pins the conductor have and for what the pin use.The physical layer also use for transmission technigue that tell where in encoding bits will transmitted in to digital to analog signals and from analog to digital signals.As physical layer transmits the electrical/optical signals through the medium and tell what physical medium use and for signals stats rate tell how many volt/db used
Over the physical layer the data link layer provide error free data transfer from one node to other..It establish and terminate the connection between two node,it close the node back off when no frame buffer are available means use for traffic control,use to send or receive date in sequence,use to detect or remove the error occur in physical layer during data transmission,data link layer create and recognize the boundaries.Frame error checking for frame integrity,also use for media access management,determines is the node right to use the physical medium.
It control the operation of subnet,and tell through which physical path data well send on based network condition.it tell the router frame in network,subnet traffic control,frame fragmentation means divide the data in a packets according to network size,translate the logical physical address and network layer also use for accounting the subnet usage like provide the billing information.
It deliver the message of error free and no duplication in data and use the protocol of higher layer and transfer the data between one to other pair.It do message segments mean divide massage in small unit and take data from session layer.Transport layer look after the delivery of message in end to end.It control the message traffic and define that which message belong to which session and keep in a link
session control the session running between different station.It maintain terminate and allow the physical application are establish between two machine use to terminate the connection.The session layer basically use for communication over the network and security like log in so on.
It use as a translator in the network,it formats the data present in the application layer,it translate data into a common formats at the sending end and in receiving end again it formats the data from common to like present in application layer,translate the character of code,Data conversion ,it reduce the number of bit and for security point of view encrypt the data like password encryption etc
It provide the window services to access the network services.like use for sharing process,remote file access,inter process communication,printer sharing,mail services,directory services,management of network and terminals of network.
