at the network layer, congestion control mechanism takes place
Congestion refers to the traffic at receiver or overwhelming of receiver. Techniques that avoid congestion are congestion control techniques. And it takes place at network layer.
transport layer
congestion is Traffic in excess of network capacity. it occurs network layer and it is one of the function of network layer.
Congestion control mechanisms are tools that control how backed up a substance may get. Traffic congestion control mechanisms can be stop lights, for example.
The techniques include End-system flow control, Network congestion control, Network based congestion avoidance and Resource allocation.
what are the congestion prevention policy on network lay
If you are talking strictly about routing, then layer 3 (the Network layer). There are some routing protocols, usually known as link-state routing protocols that are aware of network congestion problems and can re-route as necessary. Network congestion is not restricted to routing alone, however. At layer 4 (Transport Layer) there is a facility known as flow control, which can pause a sending network if the receiving network is too busy to accommodate all the packets.
It don't control congestion that is up to the routers and gateways as they are the ones that look at the traffic and figure out the best way to send something over the internet.
Average rate will remain same but Flow control: end-to-end mechanism for regulating traffic between source and destination • Congestion control: Mechanism used by the network to limit congestion
In congestion control, the load on a network is prevented from exceeding the capacity. Quality of service refers to the characteristics that a flow of data seeks to attain. If there is good congestion control, then the QoS is also good and vice versa.
The use of UDP is controversial for streaming multimedia application, because UDP lacks any form of congestion control. While congestion control is needed to prevent the network from entering a congested state in which very little useful work is done. If everyone were to start streaming high bit-rate video without using any congestion control, there would be so much packet overflow at routers that no one would see anything. So the lack of congestion control in UDP is a potentially serious problem. In short its faster but has no error detection.
Flow Control
Congestion control does ensure that the network does not become saturated at any one point. This ensures that there is no compromise in the quality of service.
Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing Where is the following items located in IVP4 header? Congestion Control Differentiated Services/QOS (Quality of Service) Error detection and correction Flow Control "Connection oriented" Queues/Queuing