Transport Layer of OSI Model

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Computer Networking Computer Networking

Transport Layer of OSI Model

The basic function of the Transport layer is to accept data from the layer above, split it up into smaller units, pass these data units to the Network layer, and ensure that all the pieces arrive correctly at the other end.

The transport layer prepares applicaiton data for transport over the network and processes network data for use by applications. The transport layer is the layer in the open system interconnection (OSI) model responsible for end-to-end communication over a network. It provides logical communication between application processes running on different hosts within a layered architecture of protocols and other network components.

transport layer

The transport layer is also responsible for the management of error correction, providing quality and reliability to the end user. In the OSI model, the transport layer is the fourth layer of this network structure.

Role of Transport Layer

  • Encapsulating application data for use by the Network layer
  • Enables multiple applications to communicate over the network at the same time on a single device
  • Ensures that, if required, all the data is received reliably and in order by the correct application
  • Employs error handling mechanisms

Responsibilities of Transport Layer

  • Tracking the individual communication between applicationson the source and destination hosts (Establishing a Session )
  • Segmentingdata and managing each piece
  • Reassemblingthe segments into streams of application data
  • Identifying the differentapplications (Port Number)

Design Issues with Transport Layer

  • Accepting data from Session layer, split it into segments and send to the network layer.
  • Ensure correct delivery of data with efficiency.
  • Isolate upper layers from the technological changes.
  • Error control and flow control.

Computer Networking Computer Networking

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