Enterprise networking is currently a major industry – over $40 billion in revenue in 2015 and growing. In this industry, some major powerhouse companies have consistently shown their value to the market, and Network World has compiled a list of the ten most dominant. Their findings were based on consultations with industry analysts, journalists, and their own research, and focused on market share in core networking, monitoring and management, and more. Some entries may seem obvious, some may be unexpected. But this article provides handy, easy-to-read information about key industry players and what solutions they offer, which will be helpful to both veteran and new IT administrators alike.