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Kurose Ross 6th Edition PN 745 R17

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Please explain answer of following question.

R17. What does it mean to say that a nonce is a once-in-a-lifetime value? In whose
lifetime?
Ans given ->  Once in a lifetimes means that the entity sending the nonce will never again use that value to check whether another entity is “live”.
 

Please explain the answer.

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