No, I've never worked for Cisco, but I did have my own firewall product at one point. (: That's another story for another day though.

Plan 9 is, at its core, still an ambient authority system, and I will never try to misrepresent it otherwise. That said, I've found it does an admirable job emulating what a "familiar" (in the sense of not looking completely alien to someone who only knows ambient authority) object-capability system could look like, kind of like how you can emulate the free monad in Ruby despite it not being a functional programming language.

This is possible principally because the mantra of Plan 9 is that everything is a filesystem: if you can bind it into your namespace, you can access it. As a corollary, if you can't bind it into your namespace, you can't access it. It makes shaping one's ambient authority a remarkably productive endeavor.