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 .