OSI Model

OSI Model o    International Standards Organization (ISO) 1947 o    Multinational body dedicated to worldwide agreement on International Standards o    An ISO Standard that covers all aspects of Network Communication is Open System Interconnection Model (OSI) o    Open System: A model that allows two different systems to communicate regardless of their underlying network o    Vendor -Specific Models close off communication ™   Purpose of the OSI MODEL        Open Communication between different systems without requiring changes to the underlying hardware and software. OSI   Model   is   not   a   Protocol.   It   is   a   model   for   understanding   and designing a network architecture that is flexible, robust and interoperable ™  Definition of the OSI MODEL A layered framework for the design of network systems that allows communication across all types of computer systems regardless of their underlying architecture ™  Layers of the OSI Model 1.  Physical (Bits) 2.  Data Link (Frames) 3.  Network   (Packets) 4.  Transport (Segment) 5.  Session     (Dialog units) 6.  Presentation (Raw Data) 7.  Application (Text, Numbers)