Bit embarrassing when you don't know the answer. Residents often don't. For example, I've lived near Cambridge all my life. If anyone asks where any one of some of the colleges is, I often don't know. And as for streets; local people may recognise the name as one they've heard but have no idea exactly where it is. They know where shops and pubs are but don't recognise the street named as being the same street as the shop or pub is in. Well, they've never needed the street name to find these landmarks, since they know how to get to them without ever knowing that.
Mind, tourist offices abroad are commonly worse than any local; I once asked, in Israel, where a museum was and, typically, the young assistant didn't know. It was 100 metres away from where she was sitting.