Dividing a server into multiple virtual machines has brought down firms' purchasing costs and allowed for more efficient use of existing hardware. However, virtualization also poses security risks and challenges, including managing a more complex network, additional layers of technology, potential data leaks as multiple virtual machines share common communication lines, and the threat of rogue machines.
The most common form of virtualization entails creating a layer--a hypervisor--between the cold, hard metal of the server and the virtual machines that sit on top of it. Each virtual machine has its own operating system and runs its own applications.
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