Once an interviewer asked me, "Can we use OSPF without area 0?" I was not able to answer at that time.
Later on, I searched, but I did not not find a satisfactory answer for this question. So, can we really use OSPF without Area 0?
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If not using area 0 or backbone area then it means that single area ospf is being implemented here..
What is single area ospf read it here:- http://learnwow.blogspot.in/2017/10/ospf-in-networking-top-standout-characteristics.html