Re: one one of the biggest data security breaches in history.
AC - if I have two servers that need to talk to one another (lets say a classic client-server app where a front-end website talks to a back-end database).
How would choosing a protocol other than TCP/IP or a protocol supporting encryption provide me with more protection than a well firewalled (i.e. only necessary ports opened between zones, ensure zone separation for non-related functions), TLS-encrypted transport stream running over TCP/IP? In terms of one continuous network, firewalls provide an easy way of addressing the "one continuous network" issue to provide security, assuming they aren't configured with allow any rules.
The problem isn't TCP/IP, the problem is poor implementation - alternative network protocols will suffer the same issues.