I'm creating a network dataset from a road feature class. But I didn't create topology of that road feature class. My question is here, should I build a topology of that feature class to create a network dataset of same? If yes then please inform me ASAP.
You do not need to create topology to create a network dataset. However the creation of correct network topology relies on connectivity. If your data is well constructed with end points meeting each other, etc then it should be fine. If you do not have good topologically connected data then you will have to work with the topology tools or the Integrate tool to first get your data in a good shape for network dataset creation.