Explanation
When leasing space in a data center, an organization can avoid the enormous startup and building costs associated with a data center, and can instead leverage economies of scale by grouping with other organizations and sharing costs.

Volume storage is allocated and mounted as a virtual hard drive within IaaS implementations, and it can be maintained and used the same way a traditional file system can. Object storage uses a flat structure on remote services that is accessed via opaque descriptors, structured storage resembles database storage, and unstructured storage is used to hold auxiliary files in conjunction with applications hosted within a PaaS implementation.

Explanation
The standards put out by the National Fire Protection Association (NFPA) cover general fire protection best practices for any type of facility, but also specific publications pertaining to IT equipment and data centers.

Explanation/Reference:
Explanation:
Hardened perimeter devices are more useful at attenuating the risk of external attack.