The Transport Layer of OSI Model

Computer NetworkComputer EngineeringMCA

The transport layer (Layer 4) is responsible for delivery of an entire message from an application program on the source device to a similar application program on the destination device.

The main functions of the transport layer are as follows −

  • It delivers a message from a specific process of one computer to a specific process in another computer. The transport layer adds a port address to the header of the data packet.
  • It divides a message into smaller segments such that each segment contains a sequence number along with the port address. It ensures that the segments arrive correctly at the receiver’s end and then reassembles them.
  • It provides an error-free point-to-point channel for both connectionless and connection-oriented services.
  • It isolates the upper layers, i.e., the user support layers from any changes in hardware technology in the lower layers, i.e., network support layers.
  • It identifies errors like damaged packets, lost packets, and duplication of packets, and provides adequate error-correction techniques.

Published on 13-Jul-2018 16:06:04