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Computer Networking (OSI Model (Advantages: -Standard and…

- - - - Datalink - Layer 2
      - Network - Layer 3
      - Transport - Layer 4
      - Session - Layer 5
      - Presentation - Layer 6
        
        Functions
        
        Data Representation/syntax:
        
        Ensures that data is readable by receiving system
        
        Formats data to be presented to application layer
        
        Structures data
        
        Negotiates data transfer syntax for application layer
        
        Provides encryption
        
        Examples
        
        Different systems(Linux, Mac, Windows) has different ways of formatting the data.
        
        To ensure receiving system can receive and understand the data it is receiving, data needs to be changed to Machine Independent Format
        
        Examples of Machine Independent Format:
        
        JPG
        
        MPEG
        
        mp3
        
        zip
        
        html
      - Physical - Layer 1
      - Application - Layer 7
        
        Functions
        
        Network Processes to Applications:
        
        Provides access for users
        
        Provides network services to application processes
        
        Identify communication Partners
        
        Provides user authentication
        
        Examples
        
        Examples: Protocols used in applications like:
        
        Browsers(FTP, Telnet protocol, HTTP)
        
        Microsoft Outlook(IMAP, POP3, SMTP)
        
        The applications uses these protocol to communicate with lower layers of the OSI Model
        
        Other Examples:
        
        remote file access
        
        remote printer access
        
        resource sharing
        
        directory services