Closed loop congestion is based on:

The correct answer is Option 4) Prevention of congestion.

Key Points

• Closed loop congestion control techniques aim to prevent congestion before it becomes a serious problem in a network.
• These methods rely on feedback mechanisms to monitor and control data flow, ensuring that network capacity is not exceeded.
• Examples of closed loop congestion control:
  • TCP Congestion Control: Adjusts the sending rate based on feedback (ACKs, timeouts, etc.).
  • Window-based flow control: Restricts the number of unacknowledged packets to avoid overloading the receiver.
• Closed loop systems act dynamically based on network conditions and try to adjust the traffic proactively to avoid congestion buildup.

Additional Information

• Option 1 – Removal of congestion: Refers to reactive techniques used after congestion has occurred (not closed loop).
• Option 2 – Limiting congestion: A partial goal, but prevention is the primary aim in closed loop systems.
• Option 3 – Allowing congestion: Is not a valid approach for congestion control.
• Open Loop Congestion Control: Tries to prevent congestion by design (e.g., good routing, traffic shaping), without using feedback.