I'm talking about op-sec. Network design is but a single aspect of that, and often doesn't feature at all. I mean this more in the sense described by Wikipedia¹, and not the likes of SecurityStudio²/Fortinet³ (first two search results).

¹ https://en.wikipedia.org/wiki/Operations_security ² https://securitystudio.com/operational-security/ ³ https://www.fortinet.com/resources/cyberglossary/operational...