AWS Certified Cloud Practitioner — Question 23

How does the AWS global infrastructure offer high availability and fault tolerance to its users?

Answer options

• A. The AWS infrastructure is made up of multiple AWS Regions within various Availability Zones located in areas that have low flood risk, and are interconnected with low-latency networks and redundant power supplies.
• B. The AWS infrastructure consists of subnets containing various Availability Zones with multiple data centers located in the same geographic location.
• C. AWS allows users to choose AWS Regions and data centers so that users can select the closest data centers in different Regions.
• D. The AWS infrastructure consists of isolated AWS Regions with independent Availability Zones that are connected with low-latency networking and redundant power supplies.

Correct answer: D

Explanation

The correct answer, D, accurately describes how AWS Regions and Availability Zones operate independently while still being interconnected, which enhances fault tolerance and availability. Option A incorrectly suggests that Regions are not isolated, while B misrepresents the geographic distribution of Availability Zones, and C focuses on user choice rather than the underlying infrastructure's resilience.