It's no secret that the proliferation of the cloud and virtualization has transformed the core of network security. And nowhere was this trend more evident than at Interop 2011, held at the Mandalay Bay Resort and Casino in Las Vegas. This year, security companies had a strong presence at the world's biggest IT network conference. During the show, attendees could find everything from next-generation firewalls to unified threat management devices to access management and application control conducted in the cloud.

Here are a few of the products seen on the show floor.