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Two copies of same packet reach the router at same time during flooding. Which one will it accept ?

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explanation : 

 flooding increases  congestion  bcz of packet  duplication( each packet has been passed blindly to connected  nodes except source node), and this causes traffic  in network  . so now what should we use for prevention. 

so duplication  can be prevented  by time stamp  to every packet . 

time stamp - give smaller  sequence  number  to early comers.(  for ex-  suppose  you are late in your  school and mam has given you token no 1 , other one who  came  late than you  ,  he will got token number 2  and so on ....)  here that token number is sequence number from  here now each router  will know which one is old packet  and which one is new . 

so when same packet  will reach at each node than , router will give priority  to new packet  ... bcz it will have more recent  data . 

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