Over time a typical enterprise accumulates multiple security products and services as access needs evolve, each designed to address a different function. For example, mobile device management (MDM) is popular and widely used, as are remote tunneling technologies such as SSL and IP VPN platforms. Network and Application firewalls are everywhere and made by dozens of vendors, as are Two-Factor Authentication products and Network Policy (NAP) systems. Single-Sign on products are also essential, but you need two if you wish to support both the enterprise and the cloud.
The product list continues to grow while application and access needs grow as additional technologies are continually added to help control access.