THIRD MEETING OF IT2

  OSI MODEL-use for solving problems or tracing problems


OSI-OPEN SYSTEM INTERCINNEC

THE OSI REFERENCE MODEL

• 7 APPLICATION
• 6 PRESENTATION
• 5 SESSION
• 4 TRANSPORT
• 3 NETWORK
• 2 DATA-LINK
• 1 PHYSICAL

APPLICATION- layer deal with networking application
                           Ex: email, web browser
PRESENTATION- responsible for presenting the data in the requered format which may include
SESSION- establishes, manages and termates sessions between communicating hosts
TRANSPORT- breaks up the data from sending host and then ressembles it in the receiver
NETWORK- sometimes referred to as the "cisco layer"
DATA LINK-provides reliable transit of data across a physical link
PHYSICAL- media though which the data