To borrow from the Nobel Prize winning songwriter, the (security) times, they are a-changin’. When the commercial Internet was young – say in 1995 – IT structure was relatively simple. It consisted of just three layers: server, network and client. Each had its own security component.
Ah, the good old days. Growing complexity is one of today’s IT’s biggest security challenges. The more complex the system, the greater the attack surface (in general). It is much easier now to hide multi-pronged canattacks in different layers and parts of the IT infrastructure.