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Flow control is an essential mechanism in data communication and computer networks that regulates the rate at which data is transmitted between a sender and a receiver. Its primary objective is to ensure that the sender does not overwhelm the receiver by sending data faster than it can process or store. Since different devices operate at different processing speeds and have limited buffer capacity, flow control helps maintain a balanced and efficient communication process. It is mainly implemented at the Data Link Layer and Transport Layer of the network architecture. The need for flow control arises when a high-speed sender communicates with a slower receiver. Without proper control, the receiver’s buffer may overflow, leading to data loss and retransmissions, which reduce network performance. Flow control prevents this situation by coordinating data transmission using acknowledgments, buffering, and window management techniques. By monitoring the receiver’s readiness, the sender can adjust the transmission speed accordingly. Two major flow control methods are commonly used: Stop-and-Wait and Sliding Window. In the Stop-and-Wait method, the sender transmits one frame at a time and waits for an acknowledgment before sending the next frame, ensuring reliability but reducing efficiency. The Sliding Window method improves performance by allowing multiple frames to be sent before receiving acknowledgments, thus making better use of available bandwidth. Overall, flow control plays a vital role in ensuring reliable and efficient communication. It prevents receiver overload, reduces packet loss, improves bandwidth utilization, and supports smooth data transfer in modern applications such as video streaming, online communication, and cloud computing.#snsinstitutions #snsdesignthinkers #designthinking