AWS (Amazon Web Services) Certification Practice Exam

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Which of the following best describes the difference between an AWS region and an availability zone?

  1. A region is a single data center; an availability zone is a collection of data centers.

  2. A region contains multiple availability zones linked by low-latency networks.

  3. An availability zone exists in one geographic location only.

  4. Regions are for data processing; availability zones are for storage only.

The correct answer is: A region contains multiple availability zones linked by low-latency networks.

The statement that a region contains multiple availability zones linked by low-latency networks accurately captures the architecture and design of AWS. An AWS region is a broad geographic area, and within each region, there are several availability zones that are isolated from each other but connected through high-speed, low-latency links. This design enhances the reliability and fault tolerance of applications by allowing customers to distribute their workloads across multiple availability zones while still operating within the same region. This segmentation not only supports high availability but also provides flexibility in deploying applications. For instance, if one availability zone experiences an outage, applications can be automatically or manually redirected to another availability zone within the same region, minimizing downtime and ensuring continuity of service. The other options misconstrue the structure and function of regions and availability zones. For example, describing a region as a single data center does not capture the larger scope of a region, which encompasses multiple zones. Furthermore, the assertion that availability zones only exist in one geographic location is misleading since availability zones actually are sometimes in different areas to maximize redundancy. Lastly, the idea that regions are strictly for data processing while availability zones are only for storage ignores the multipurpose functionality of both components, as they are utilized for a variety of computing,

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