What are the functions of transport layer?

The functions of the transport layer are as follows:

1. Segmentation and reassembly: The transport layer breaks down the data received from the upper layers 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. Connection establishment and termination: The transport layer establishes a connection between the sender and receiver before data transmission begins. It ensures that both parties are ready to exchange data and sets up the necessary parameters for the communication. Similarly, it also terminates the connection once the data transfer is complete.

3. Reliable data delivery: The transport layer ensures the reliable delivery of data by implementing error detection and correction mechanisms. It checks for any errors or loss of data during transmission and retransmits the lost or corrupted packets to ensure the complete and accurate delivery of data.

4. Flow control: The transport layer manages the flow of data between the sender and receiver to prevent congestion and ensure efficient transmission. It regulates the rate at which data is sent and adjusts it based on the receiver's capacity to handle the incoming data.

5. Multiplexing and demultiplexing: The transport layer allows multiple applications or processes to use the network simultaneously by multiplexing their data. It assigns unique identifiers to each application or process and uses these identifiers to demultiplex the received data and deliver it to the appropriate destination.

Overall, the transport layer plays a crucial role in ensuring the reliable and efficient transmission of data across a network.