Discussion
Network congestion occurs:
Answer: A
Correct answer: in case of traffic overloading
Congestion occurs when the traffic offered to a link or a router exceeds what it can carry, so queues build up, delay rises and packets are eventually dropped. It is a capacity problem, not a failure: nothing has broken. TCP responds by treating loss as a congestion signal and reducing its window, which is what keeps the Internet stable under load; a terminated connection or a failed node is a quite different condition.
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