OSI Refrance Model

on

 

OSI MODEL


1. ISO REPRESENT A 1947 MORE THAN WORK AND AGAIN REPRESENTS A ISO IN 1977 AND MORE THAN WORK AN REPRESENT  IN 1983 A OSI REDFRENCE MODEL.

2. HIS MODEL REPRESENT A 7 LAYER

3. OSI MEANS  (OPEN SYSTEMS INTERCOMMUNICATIO).

1. APPLICATION LAYER

1. THE APPLICATION LAYER IS USED BY END-USER SOFTWARE SUCH AS WEB BROWSERS AND EMAIL CLIENTS. 

IT PROVIDES PROTOCOLS THAT ALLOW SOFTWARE TO SEND AND RECEIVE INFORMATION AND PRESENT MEANINGFUL DATA TO USERS.

2. IT SENDS ITS DATA TO THE FORM OF THE PDU.



PROTOCLS  AND DEVICES USED IN LAYER

THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE APPLICATION LAYER.

WHICH IN TURN WORKS AT THE APPLICATION LAYER.MANY DEVICES USE IT AT THE APPLICATION LAYER.

PROTOCOLS

FTP  (FILE TRANSOFER PROTOCOL)

DNS (DOMAIN NAME SYSTEM)

HTTP (HYPER TEXT TRANSFOR PROTOCOL)

DEVICES

ALL END DEVICES USED IN LAYER.

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2. PRESENTATION LAYER

1. THE PRESENTATION LAYER RECEIVED  THE DATA FROM APPLICATION LAYER AND PROCESSES THE RAW DATA AND THEN COMPRESSES THE DATA AND ENCODE THE DATA SO SESSION LAYER EASILY RECIEVE THE DATA.

2. PRESENTATION LATER SENDS ITS DATA IN PDU FORMAT. 


PROTOCLS  AND DEVICES USED IN LAYER

THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE PRESENTATION LAYER.

WHICH IN TURN WORKS AT THE PRESENTATION LAYER.MANY DEVICES USE IT AT THE APPLICATION LAYER.

PROTOCOLS

NCP  (NETWARE CORE PROTOCOL)

LPP (LINEAR PROGRAMMING PROBLEM)

DEVICES

GATEWAY OR FIREWALL OR PC.

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3. SESSION LAYER

1. IT IS USED TO MANAGE USER CONNECTIONS SESSION LAYER CONTROLS THE CONNECTION BETWEEN COMPUTERS.

2. IT ESTABLISHES, MANAGES AND TERMINATES CONNECTIONS BETWEEN USERS OR REMOTE APPLICATIONS.

3. IT TRANSMITS ITS DATA IN PDU FORM.



PROTOCLS  AND DEVICES USED IN LAYER

THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE SESSION LAYER.

WHICH IN TURN WORKS AT THE SESSION LAYER.MANY DEVICES USE IT AT THE APPLICATION LAYER.

PROTOCOLS

  PPTP (POINT-TO-POINT TUNNLING PROTOCOL)

  RPC (REMOTE PROCRDURE CAL PROTOCOL)


DEVICES

GATEWAY OR FIREWALL OR PC.

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4. TRANSPORT LAYER

1. WHEN OUR DATA MOVES FROM ONE PLACE TO ANOTHER, CONTROLS THE DATA FLOW. 

2. IF ANY PROBLEM OCCURS DURING DATA TRANSFER, IT RESOLVES IT. 

3. IF THE DATA IS MORE, IT CONVERTS AND TRANSFERS THIS DATA IN SEGMENTS SO THAT THERE IS NO PROBLEM IN THE DATA AND YOUR DATA IS EASILY TRANSFERRED.

4.  IT SENDS ITS DATA IN THE FORM OF SEGMENTS.

PROTOCLS  AND DEVICES USED IN LAYER

THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE TRANSPORT LAYER.

WHICH IN TURN WORKS AT THE TRANSPORT LAYER.MANY DEVICES USE IT AT THE APPLICATION LAYER.

PROTOCOLS

  TCP (TRANSMISSION CONTROLL PROTOCL)

  UDP (USER DATAGROUND PROTOCOL)


DEVICES

GATEWAY OR FIREWALL PC.

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5. NETWORK LAYER

1. THE NETWORK LAYER CHOSES BEST PATH YOUR PACKET  AND THEN FORWARDS IT FORWARD SO THAT THERE IS NO PROBLEM IN FORWARDING THE PACKET

2. NETWORK LAYER ALLOWS THE TRANSFER OF DATA PACKET OF CONNECTIONS BETWEEN NETWORKS.

3. IT SENDS ITS DATA IN THE FORM OF PACKET

PROTOCLS  AND DEVICES USED IN LAYER

THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE NETWORK LAYER.

WHICH IN TURN WORKS AT THE NETWORK LAYER.MANY DEVICES USE IT AT THE APPLICATION LAYER.

PROTOCOLS

  IPV4 (INTERNET PROTOCOL VERSION 4)

    IPV6 (INTERNET PROTOCOL VERSION 6)

ICMP (INTENET CONTROLLL MESSAGE PRTOCOL)


DEVICES

ROUTER.

MULTY LAYER SWITCH.

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6. DATA LINK LAYER 

1. THE DATA LINK LAYER ESTABLISHES AND TERMINATES A CONNECTION BETWEEN TWO PHYSICALLY-CONNECTED NODES ON A NETWORK.

IT BREAKS UP PACKETS INTO FRAMES AND SENDS THEM FROM SOURCE TO DESTINATION.

2. THIS LAYER IS COMPOSED OF TWO PARTS—LOGICAL LINK CONTROL (LLC), WHICH IDENTIFIES NETWORK PROTOCOLS, PERFORMS ERROR CHECKING AND SYNCHRONIZES FRAMES, AND MEDIA ACCESS CONTROL (MAC) WHICH USES MAC ADDRESSES TO CONNECT DEVICES AND DEFINE PERMISSIONS TO TRANSMIT AND RECEIVE DATA.


PROTOCLS  AND DEVICES USED IN LAYER

THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE DATA LINK LAYER.

WHICH IN TURN WORKS AT THE DATA LINK LAYER .MANY DEVICES USE IT AT THE APPLICATION LAYER.

PROTOCOLS

(PPP)  Point To Point Protocol.

(LAP)  Link Control Protocol 

   Link Access Procedure.

(NCP ) Network Control Protocol .


DEVICES

ROUTER.

MULTY LAYER SWITCH.

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