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Why does congestion occur?

  1. Because the routers and switches have tables
  2. Because the routers and switches have queues
  3. Because the routers and switches have cross-points
  4. None of the options
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option D is the answer because congestion is the result of poor bandwidth, data transmission etc. It has nothing to do with what mentioned in other options.

If in option b , there was queuing delay mentioned then it'd be the correct answer.

 

reference:- https://en.wikipedia.org/wiki/Network_congestion

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