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Congestion control in data communication and computer networks refers to the set of mechanisms used to prevent, detect, and recover from congestion in a network. Congestion occurs when the demand for network resources exceeds the available capacity, leading to packet loss, increased latency, and decreased throughput. To maintain efficient and reliable communication, networks implement various congestion control mechanisms at different layers of the network protocol stack, particularly at the network and transport layers. Congestion control mechanisms can be broadly classified into two categories: open-loop congestion control and closed-loop congestion control. Open-loop mechanisms attempt to prevent congestion before it occurs, while closed-loop mechanisms aim to respond to congestion once it has been detected. Various techniques and strategies have been developed for both categories, involving cooperation between routers and end systems. ### 1. Open-loop Congestion Control Mechanisms Open-loop congestion control involves policies that are applied to prevent congestion from occurring in the first place. These mechanisms are based on predefined rules and configurations and do not rely on feedback from the network. #### a) Traffic Shaping Traffic shaping, also known as traffic smoothing, regulates the data transmission rate to ensure that it does not exceed the network’s capacity. The most common traffic shaping techniques are the Leaky Bucket and Token Bucket algorithms. * Leaky Bucket Algorithm: This algorithm controls the data rate by allowing data to be sent at a constant rate, regardless of the burstiness of incoming traffic. Packets are queued in a buffer and transmitted at a fixed rate, thereby smoothing out traffic bursts and reducing the risk of congestion. * Token Bucket Algorithm: This technique allows bursts of traffic up to a certain limit. Tokens are generated at a fixed rate and stored in a bucket. Each packet requires a token to be transmitted. If tokens are available, packets are sent; otherwise, they are delayed or dropped. This method offers more flexibility compared to the leaky bucket. #### b) Admission Control Admission control is a policy used to determine whether new traffic flows can be admitted into the network based on current load and resource availability. If admitting a new flow is likely to cause congestion, it is rejected or delayed. This mechanism is commonly used in ATM networks and multimedia applications to guarantee Quality of Service (QoS). #### c) Resource Reservation Resource reservation protocols, such as RSVP (Resource Reservation Protocol), allow applications to reserve necessary resources like bandwidth and buffers in advance. By allocating resources before transmitting data, networks can avoid overloading and congestion. #### d) ____ _________ _______ _____ ___ ______ ____.
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