Typically, data center administrators have applied security controls in the traditional manner. There are firewalls, authentication mechanisms, vulnerability assessment, logging, alerting and more When the data center migrated to the cloud, it was tough to take these functions along for a lot of reasons.First, virtual machines don't behave exactly like their physical counterparts under the covers. That means that such things as firewalling can be challenging. Managing access control can pose equally daunting challenges. As well, in a public cloud these problems are exacerbated by the legal issues surrounding multi-tenant environments.
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