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The Transport Layer of OSI Model
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.
- Related Articles
- The Physical Layer of OSI Model
- The Network Layer of OSI Model
- The Session Layer of OSI Model
- The Presentation Layer of OSI Model
- The Application Layer of OSI Model
- The Data Link Layer of OSI Model
- The Transport Layer in TCP/IP Model
- The OSI Reference Model
- Advantages and Disadvantages of the OSI Model
- What is the transport layer?
- Computer Networks – Layers of OSI Model
- What is the OSI Reference Model?
- OSI Model in Computer Networking
- What are the critiques of OSI Model and Protocols?
- Explain the advantages and disadvantages of the OSI reference Model
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