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CSMA/CD

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Two CSMA/CD stations are each trying to transmit long (multiframe) files. After each frame is sent, they contend for the channel, using the binary exponential backoff algorithm. What is the probability that the contention ends on round k?

   
   
 

(A) ΣkPk
 

(B) kPk
 

(C) ΣPk
 

(D) none
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