Answer:
I think the answers would most definitely be requiring a login to access the network because if businesses had a network with no login, anyone could get into it. Others would be providing employees with access privileges so that way ONLY employees may get into certain things, and possibly having employees change their passwords regularly so that way, anyone who has the employees previous password can't log in at any time to steal anything cause it's changed.
Hope this helped! Have a great day! - Olli :]