VMMs and Hypervisors
You’ve already seen virtualization in action with the example shown using VMware Workstation earlier in this chapter. Many networks use a few virtual machines to augment and refine a traditional network closet. VMware Workstation is how I first performed virtualization on PCs, but the technology and power have grown dramatically over the last few years.
VMware Workstation requires an underlying operating system, so it functions essentially like a very powerful desktop application. What if you could remove the OS altogether and create a bare-metal implementation of virtualization?
VMware introduced ESX in 2001 to accomplish this goal. ESX is a hypervisor that’s powerful enough to replace the host operating system on a physical ...

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