I'll give you one example I went out and saw in the field last weekend. TOURtech, "the market leader in providing temporary network solutions for the events industry", runs all their Internet traffic at events through a HA pair of pfSense boxes. They do the networking for many large events. Last weekend, they invited me down to see their impressive setup at ACL Fest. It's a significant network across the site, with all their Internet traffic (payment processing and other mission-critical things to the event) running through a pair of our C2758 appliances.
@acriollo:
maybe something like CISA CISM CGEIT CRISC ?
Those are certifications for people, not software.
@charliem:
Maybe he refers to Safe Harbor; Cisco certifies certain IOS (old) releases, or they used to anyway.
That's a QA thing of sorts, and maintaining old software for certain usage cases. Don't think that's really relevant here.