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TCP or Transmission Control Protocol is designed to provide reliable data transmission. One of its key features is congestion control. Congestion control helps to ensure that the network is not overwhelmed by too much data at once. This is done through algorithms that manage the rate at which data is sent. If the network becomes congested, TCP dynamically reduces the data transmission rate to ease the load. When the network state improves, it gradually increases the rate again. This helps to balance traffic efficiently and avoid packet loss.
This mechanism is crucial for maintaining network stability, especially in scenarios where multiple data streams are transmitted simultaneously.

UDP, or User Datagram Protocol, is used widely in applications like video streaming due to its low-latency transmission capabilities. Unlike TCP, UDP does not involve handshaking and retransmission of packets. This is because real-time applications, such as video calls, cannot afford delays caused by retransmissions.
Although this enhances real-time performance, UDP lacks built-in congestion control, making the network vulnerable to congestion if too much data is sent at once. This can potentially overwhelm network bandwidth and cause substantial packet loss, negatively impacting other network traffic, particularly data streams managed by TCP.

RTCP or Real-Time Control Protocol works alongside RTP (Real-Time Transport Protocol) to manage video streams. RTCP provides feedback through receiver reports, which include valuable information about the quality of the received data. These reports are sent periodically and detail the percentage of packets received successfully during the reporting period.
This feedback mechanism is essential for adaptive streaming. By analyzing RTCP reports, the source can make informed decisions to adjust the transmission rate, optimizing the quality and stability of the video stream and ensuring better use of network resources.

Network congestion occurs when the volume of data exceeds the network's capacity to handle it. This can lead to packet loss, delays, and reduced network performance. Video streams using UDP, due to the lack of built-in congestion control, can exacerbate congestion problems.
Congestion negatively impacts all network users, including those using TCP for data transmission. TCP’s congestion control mechanism helps alleviate the problem by reducing the data transmission rate, but unregulated UDP traffic can still cause significant disruptions. Thus, it’s crucial to manage and balance traffic effectively to maintain network efficiency and reliability.

Real-time performance is critical for applications like video streaming, online gaming, and voice over IP (VoIP). These applications require data to be delivered quickly and in sequence, without the delays caused by retransmissions.
UDP is often preferred in these scenarios because it provides the lowest latency. However, the challenge is to ensure that this real-time data transmission does not overwhelm the network. By using mechanisms such as RTCP for feedback and adjusting transmission rates accordingly, it is possible to achieve a balance. This helps in maintaining high-quality real-time performance while mitigating the risks of network congestion.