2. IT STANDS FOR“OPENSYSTEM INTERCONNECTION”
IT WAS DEVELOPED BY “ISO” IN 1984
IT WAS DESIGNED FOR UNDERSTANDING DATA
COMMUNICATION BETWEEN 2 NETWORKS
IT DIVIDES THE COMMUNICATION PROCESS INTO SEVEN
LAYERS
3. LAYERS OF OSI MODEL
PHYSICAL LAYER: ESTABLISHES CONNECTION
BETWEEN NETWORK & DEVICES
DATALINK LAYER:
THE MESSAGE IS CONVERTED INTO BITS &
LATER BITS CONVERTED INTO MESSAGE
4. NETWORK LAYER: THE NETWORK ADDRESS
TRANSLATES DATA INTO PHYSICAL ADDRESS
o BREAKS THE DATA INTO SMALLER UNITS
TRANSPORT LAYER: DATA IS CONVERTED INTO
PACKETS
o PACKETS ARE CHANGED INTO MESSAGE
o DELIVERY OF DATA SHOULD BE ERRORFREE WITH
NO MESSAGE LOSS
o IT PROVIDES ACKNOWLEDGEMENT OF
SUCCESSFUL TRANSACTION
5. SESSION LAYER: IT IS HELPFUL FOR IDENTIFYING
o MANAGES THE DATA TRANSMIT FOR CERTAIN
TIME
PRESENATTION LAYER: IT TRANSLATE DATA
FROM APPLICATION TO NETWORK( ASCII KEY)
APPLICATION LAYER: IT ALLOW ACCESS TO
NETWORK SERVICES THAT SUPPORT
APPLICATIONS
