Physical machines versus virtual machines
Seeing a section on virtual machines in a networking book may come as somewhat of a surprise. To be fair, it certainly is out of place. In addition to being an important enterprise platform, virtualization can also be an invaluable learning tool. In real networks, a technician may test a service in a virtual machine before rolling it out to the environment. For example, a new DNS server may begin life as a VM, and then once it is tested and proven, moved into an environment for use by the organization. One benefit of this approach is that you can take several snapshots as you develop the solution, and should you mess up and ruin it, you can just restore the snapshot and begin from a known-working state. ...
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