OSPF topic in CCNA

#1

In ospf routing protocol DR,BDR and OtherDR election process. Who is elected first DR or BDR please explain ?

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#2

First tell me why OSPF has DR BDR election ?

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#3

if you are connect ospf router in shared medium like (Broadcast multi access) they send hello to each other and generate unnecessary traffic due to this reason bandwidth more utilization in network so in this type of network ospf elect dr and bdr.
But point to point and non-broadcast does not elect dr and bdr.
please try to understand because my english is very weak.

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