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Network Model Layers

  1. Application layer: provides network services to user applications and determines the resources required for applications to communicate with each other.
  2. Physical layer: responsible for activating and maintaining the physical links between devices.
  3. Network layer: Provides bit timing/synchronization, signaling, and physical specifications
  4. Presentation layer: Provides compression and decompression of data, conversion of data into different formats and data syntax conversion
  5. Session layer: Provides for communication sessions between network devices and is often called the communications manager

Network Model or Layer

When dealing with networking, you may hear the terms network model or layer. Network models define a set of network layers and how they interact. There are several different network models depending on what organization or company started them. The most important two are:
  1. TCP/IP Model:This model is sometimes called the DOD model since it was designed for the department of defense and is also called the internet model because TCP/IP is the protocol used on the NET.
  2. OSI Network Model: The (ISO) International Standards Organization has defined a standard called the (OSI) Open Systems Interconnection reference model.