What is the use of error control in transport layer if error control is already present in data-link layer?

Error control in data link layer is the process of detecting and correcting data frames that have been corrupted or lost during transmission. In case of lost or corrupted frames, the receiver does not receive the correct data-frame and sender is ignorant about the loss.

Why flow control and error control at the transport layer as we have it at the data-link layer?

Flow control in transport layer ensures the delivery of the message globally, as the two points of connection over this protocol are logically connected. Whereas in data-link layer, the concern is to deliver message locally, as the two points of connection over this protocol are physically connected.

At which layer of OSI model do layers flow and error control?

Flow and error control needs to be done at several layers. For node-to-node links, flow and error control is carried out in the data-link layer. For end-point to end-point, flow and error control is carried out in the transport layer.

What are the flow and error control mechanism in transport layer?

Flow control and Error control are the control mechanism at data link layer and transport layer. Whenever the sends the data to the receiver these two mechanisms helps in proper delivering of the reliable data to the receiver.

Does transport layer do error correction?

Error correction is done at layer 4 i.e transport layer. In data link layer redundant information is added to each frame and then at the receiver end those frames were checked and if it is invalid then the frame will be discarded.

What is flow control in transport layer?

Flow Control This increases network congestion and thus, reducing the system performance. The transport layer is responsible for flow control. It uses the sliding window protocol that makes the data transmission more efficient as well as it controls the flow of data so that the receiver does not become overwhelmed.

What is flow and error control?

Flow control is meant only for the transmission of data from sender to receiver. Error control is meant for the transmission of error free data from sender to receiver.

Why are the layers from transport layer and above called truly end to end layers?

Transport Layer is the second layer of the TCP/IP model. It is an end-to-end layer used to deliver messages to a host. It is termed as an end-to-end layer because it provides a point-to-point connection rather than hop-to- hop, between the source host and destination host to deliver the services reliably.