After posting Question i got the idea about RIP max count 15 and how router shows
beahvair to the router16, 17 ... so on...
when the router receive updates as routing tables it looks inside and accepts everything
rather than route/s which hop 16 , 17 ... so on ,,, although 16 as poisoning ,,, done entry for
route 16 but ICMP unreachable if any trafic goes on route 16...
Consider 20 routers ... R1 to R20
R1 accepting updates from R2,R3,R4...upto R15 , done entries in its routing table ,,;although 16
was declared poisoning and for router 17, 18,19,20 not because RIP has nature it only accepts routes
hop count 1 to 15 not beyond that...
but as ROUTER2 has enetries in its routing table from R4 to R16 including R1 because R1 is counted directly as R4 to
R3...
if my idea wrong then please correct me