Cisco

Cisco Systems is the world's largest networking company, with switching, routing, wireless, and security hardware running the backbone of enterprise networks across virtually every industry. Decades of certifications (CCNA through CCIE) mean there is no shortage of engineers trained specifically on Cisco gear.

That ubiquity is the point: when a corporate reseller bids on a data center or campus network project, "Cisco-certified" is often a line item in the tender itself. Carrying Cisco hardware means being able to say yes to that requirement rather than losing the deal on a technicality.