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p0941
Posts: 95
Posted 02:12 Apr 26, 2011 |

Hi Dr. Guo, 

Two questions: 

1) For homework question 1, how do we know the time for DIFS and SIFS?

2) For question 5,  the sender is D, how can we use the shortest path graph for node A in the question 4, to use the RFP?

Thank you

hpguo
Posts: 139
Posted 11:10 Apr 26, 2011 |

1) You don't need to know the values of Difs and Sifs. Just use them directly in your final results.

2) q5 is based on 4.a, so yo can use the shortest path in 4.a