Osi Model Questions Medium
The Transport layer is the fourth layer of the OSI Model and is responsible for the end-to-end delivery of data between source and destination hosts. Its main role is to provide reliable and efficient communication services to the upper layers.
The Transport layer ensures that data is delivered error-free, in the correct order, and without any loss or duplication. It achieves this through various mechanisms such as segmentation, flow control, and error detection and correction.
Segmentation: The Transport layer breaks down the data received from the upper layers into smaller units called segments or datagrams. This segmentation allows for efficient transmission over the network and helps in managing the flow of data.
Flow Control: The Transport layer implements flow control mechanisms to regulate the amount of data sent by the sender and the rate at which it is received by the receiver. This prevents overwhelming the receiver and ensures that data is delivered smoothly.
Error Detection and Correction: The Transport layer includes error detection and correction techniques to ensure the integrity of the data being transmitted. It uses checksums or other error detection codes to detect any errors that may have occurred during transmission. If errors are detected, the Transport layer can request retransmission of the corrupted segments.
In addition to these functions, the Transport layer also provides multiplexing and demultiplexing of data streams. It allows multiple applications running on the source and destination hosts to establish simultaneous connections and ensures that the correct data is delivered to the appropriate application.
Overall, the Transport layer plays a crucial role in ensuring reliable and efficient communication between hosts by providing error-free data delivery, flow control, and multiplexing/demultiplexing capabilities.