NETWORK ESSENTIAL

                                                                 OSI MODEL 

Application layer -:   This is the 7th layer of osi model which directly deals with and user application 

Ex-: Gmail, common protocal which work on this layer , HTTP , SMPT , TALNET , IMP . 

PRESENTATION LAYER -: THIS  IS THE 6TH LAYER OF  OSI  MODEL , THE WORK OF IS TO CHECK WHAT IS FORMATE OF DATA INPORT DATA  INCRISTION DESCRIPTION AND COMPRESSION , DECOMPRESSION .

* THIS LAYER MAINLY RESPONSIBLE TO MAKE DATA UNDER STANDABLE FOR APPLICATION LAYER. 

SESSION LAYER -: THIS LAYER IS MAINLY RESPONSIBLE FOR CREATING , TERMINATE , RECONNECT AND MANAGE SESSION.

TRANSPORT LAYER -: THE WORK OF TRANSPORT LAYER IS PORT TO PORT DELIVERY ALSO KNOWNS AS END TO END DELIVERY . TRANSPORT LAYER CREATE SEGMENT OF OUR DATA AND ADD HEADER (TCP , UDP ) ON SEGMENT.

NETWORK LAYER -: THIS LAYER CREATE DATA PACKET OF SEGMENT AND ADD IP HEADER ON THIS PACKET. THIS LAYER IS RESPONSIBLE FOR SOURCE DEVICE TO DESTINATION  DEVICE  DELIVERY . ALL ROUTING PROTOCAL WORKS ON THIS LAYER .

EX -: IP , ICMP , IGMP , RIP

DATA LINK  LAYER -: THIS LAYER  IS  SUBDIVIDED  INTO TWO LAYER .

1. LLC - LOGICAL LINK CONTROL 

2. MAC -: MEDIA ACCESS CONTROL 

THE MAIN RESPONSIBILITY OF LAYER TO IS CREATE DATA FRAME (ENCAPSULATE IN TO FRAME  ENCAPSULATE ) BY ADDING HEADER AND TRAILOR ,FLOW , ERROR DETCTION .

PHYSICAL LAYER -: ALL TRANSMISSOIN MEDIUM WORK ON THIS LAYER . THIS LAYER IS RESPONSIBILE FOR SENDING OR RECEVING OUR DATA IN ELECTORNIC SIGNAL , LIGHT SIGNAL AND RADIO FREQUENCY .

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