OSI Model Assignment Help

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OSI Model Assignment Help

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OSI Model (Open System Interconnection) has been
developed by International Organization for
Standardization (ISO). It is an abstract
description for layered communications and
computer network protocol design. It is a 7 layer
architecture. All these seven layers work
together to transmit the data from one system to
another. Each layer have different functions to
work. 
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LAYERS OF OSI MODEL

• APPLICATION LAYER  It is The Topmost Layer of
  OSI model. users interact directly with
  applications that work at layer 7. Some examples
  of application layers are Google Chrome,
  Firefox, Safari, Skype, Outlook, Office.
• PRESENTATION LAYER  Presentation layer is also
  called the Translation layer.  The data from the
  application layer is translated according to the
  format to transmit over the network. 
• The functions of the presentation layer are  
•  Translation 
•  Encryption 
•  Compression

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• SESSION LAYER  Session layer is responsible for
  the security and authentication.  This Layer also
  ensure setup, coordination (how long should a
  system wait for a response) and termination
  between the applications at each end of the
  session 
• The functions of the session layer are
• Session establishment, maintenance and
  termination 
• Synchronization 
• Dialog Controller

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• Transport Layer  This layer takes data from the
  above layer and breaks it into smaller units
  called Segments and then gives it to the Network
  layer for transmission. It is responsible for the
  End to End delivery of the complete message 
•  The functions of the transport layer are
• Segmentation and Reassembly 
• Service Point Addressing

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• NETWORK LAYER  Network layer works for the
  transmission of data from one host to the other
  located in different networks. It Transmit the
  data in the form of packets. It selects the
  shortest path to transmit data. 
• The functions of the Network layer are
•  Routing 
• Logical Addressing

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• DATA LINK LAYER  The Data Link Layer provides
  node-to-node data transfer between two directly
  connected nodes. It also handles error correction
  from the physical layer.  It transmit the data as
  the frames 
• The functions of the data Link layer are 
•  Framing 
• Physical addressing 
•  Error control 
•  Flow Control 
• Access control

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• PHYSICAL LAYER  It is the lowest layer of OSI
  Model.  It is responsible for the actual physical
  connection between the devices . This layer
  contains the data in the form of bits 
•  The functions of the physical layer are 
•  Bit synchronization
•  Bit rate control 
• Physical topologies 
• Transmission mode

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