It depends on the private business you have – Large, Medium or Small:
with the 192.168.x.x address scheme you could make 254 networks each with 254 Machines connected inside each of those networks.
With the 10.x.x.x address scheme you can make lots and lots of different combinations of Networks with lots of machines inside each of those Networks.
The key would be to make sure you can manage the addresses effectively.
If you have a small business keep it simple, the addresses are private so it does not really matter which range you use, but how you use them..
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