Osi Model Questions Medium
The Transport layer protocols in the OSI Model have several functions.
1. Segmentation and Reassembly: The Transport layer breaks down the data received from the Session layer into smaller segments or packets for efficient transmission over the network. It also reassembles these segments at the receiving end to reconstruct the original data.
2. End-to-End Connection: The Transport layer establishes a logical connection between the source and destination hosts. It ensures that the data sent from one end is received correctly at the other end, providing reliable and error-free communication.
3. Flow Control: The Transport layer manages the flow of data between the sender and receiver to prevent congestion and ensure smooth transmission. It uses techniques like buffering, windowing, and acknowledgments to regulate the rate of data transfer.
4. Error Control: The Transport layer detects and corrects errors that may occur during data transmission. It uses mechanisms like checksums and sequence numbers to verify the integrity of the data and retransmits any lost or corrupted packets.
5. Multiplexing and Demultiplexing: The Transport layer allows multiple applications or processes running on the same host to share the network connection. It assigns unique identifiers (port numbers) to each application, enabling the receiving host to correctly deliver the data to the appropriate application.
6. Quality of Service (QoS): The Transport layer supports QoS by prioritizing certain types of traffic over others. It ensures that time-sensitive applications like voice or video streaming receive higher priority and are delivered with minimal delay or loss.
Overall, the Transport layer protocols play a crucial role in ensuring reliable, efficient, and secure communication between network hosts.