Implementing an access control system is a fundamental in data center security1. Access should be restricted to those individuals (plus necessary facility personnel) required to support the environmental and network infrastructure.
When developing your information security process include the physical access control system which can provide an audit trail of the physical access to the space.
If the access control system is managed via a network interface, ensure there are controls in place to approve and authorize access list changes. This will negate building security administrators granting access without proper approvals.
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