Security practitioners have been talking about layered security for decades. Layered security is currently considered a best practice for enterprises. It’s easy to overspend on individual products, to buy overlapping systems, or to leave unsecured gaps between layers. Even well-managed layers can create problems within an organization, said Jerry Irvine, CIO at Prescient Solutions. Administrators need to understand how the initial configuration and the subsequent changes might affect business processes, as well as other security systems, he said.”]
Source: https://www.csoonline.com/article/3004856/the-dark-side-of-layered-security.html