Can someone explain how the MaxSeq Num affects the sliding window protocol?

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Description

Can someone explain how the MaxSeq Num affects the sliding window protocol?

Question

Can someone explain how the MaxSeqNum affects the sliding window protocol?

For example, in this question below I don’t understand what it means.

  1. Suppose that we attempt to run the sliding window algorithm with SWS = RWS = 3 and with MaxSeqNum = 5. The Nth packet DATA[N] thus actually contains N mod 5 in its sequence number field. Give an example in which the algorithm becomes confused;that is, a scenario in which the receiver expects DATA[5] and accepts DATA[0]—which has the same transmitted sequence number—in its stead. No packets may arrive out of order. Note that this implies MaxSeqNum ≥ 6 is necessary as well as sufficient.

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