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Any way this is the broadcast network while i am sending the packet from R1 to hub means at that time itself it will broadcast that packet,then what is the use of designated router sending again or hub will unicast the packet to only designated router
If the database exchange was broadcast, you're correct it would negate much of the reason for having a DR. But it's not broadcast.
BTW:
Scenario: Refer the attachmentPriority of 10.1.1.1 is 20
Priority of 10.1.1.2 is 10
Priority of 10.1.1.3 is 0
Priority of 10.1.1.4 is 255
So Router 4's ethernet port will be the desinated router bec priority is 255
Not necessarily. R4 should become the DR when there's a DR election if all 4 were on-line at the time of an election. But if R4 joined the network after an election, it doesn't preempt.
