Many are snake oil or overhyped, but it&#x27;s generally accepted by professionals that a proper IDS or IPS appliance is helpful as an additional layer. Those alone aren&#x27;t nearly sufficient; many many layers are required. But they do add value.<p>You could make the same argument about anti-virus (IDS is really just network anti-virus), and while it&#x27;s true, it&#x27;s also true that it&#x27;s a good idea to put AV on all your endpoints.