Discussion
Network congestion occurs?
Answer: A
Network congestion occurs in case of traffic overloading.
Congestion happens when more data is offered to a network, a link or a router than it can carry. Queues in the routers fill up, packets are delayed or dropped, and throughput falls. Congestion control methods, such as TCP slowing its sending rate, exist to deal with it.
A system terminating, or a connection between two nodes ending, reduces the traffic rather than overloading the network. 'None of the above' is wrong because overloading is the cause.
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