Traditional data centers are usually built in a very non-scalable fashion: everything goes through a central pair of firewalls (and/or load balancers) with thousands of rules that no one really understands; servers in different security zones are hanging off VLANs connected to the central firewalls.
Some people love to migrate the whole concept intact to a newly built private cloud (which immediately becomes server virtualization on steroids) because it’s easier to retain existing security architecture and firewall rulesets.
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