The answer is regions, zones, and data centers.
The Infrastructure Layer consists of the data center structure as well as the equipment and systems that keep it working. The Infrastructure Layer includes components such as backup power equipment, the HVAC system, and fire suppression equipment. These gadgets and systems aid in the protection of servers and, eventually, your data.
The infrastructure-as-a-service layer is the foundation of the cloud (Infrastructure as a service). This layer consists primarily of hardware and networks. The primary differences between this and a traditional server or hosting provider are scalability and virtualization.
Therefore, the answer is regions, zones, and data centers.
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