Achieving High Availability Across Regions
Short answer
A Use EC2 instances in multiple AWS Regions.
Question
Key Takeaways
The question tests the understanding of AWS Global Infrastructure and disaster recovery strategies, specifically distinguishing between regions and availability zones for geographic resilience.
To ensure high availability during geographic disasters, EC2 instances must be deployed in multiple AWS Regions. This solution establishes cross-region redundancy to protect against local outages.
Common mistake: Candidates often confuse Availability Zones with Regions or select CloudFront for caching rather than compute availability, failing to recognize that AZs are within a single region.
Expert Analysis
Why the Answer Is Correct
Option A is correct because deploying EC2 instances in multiple AWS Regions provides the highest level of fault tolerance against natural disasters. Since natural disasters affect specific geographic areas (e.g., hurricanes, earthquakes), having infrastructure in separate, distant regions ensures that if one region goes down, another can take over traffic.
Why the Other Options Are Wrong
Option B is incorrect because Edge Locations are used by Amazon CloudFront for content delivery caching, not for hosting full EC2 instances. Option C is logically invalid; an instance cannot exist in different regions simultaneously while being in the same Availability Zone. Option D uses CloudFront for distribution, but without multi-region compute sources, it doesn't solve the underlying compute availability issue as robustly as Option A.
Community Comment Notes
The community consensus strongly supports Option A. As ShaiTay noted, this is "the best option to ensure high availability if there is a natural disaster." Meow7 also confirmed that A is correct, emphasizing the need to understand global infrastructure design principles.
Exam Strategy
Always distinguish between Availability Zones (for data center failure) and Regions (for geographic disaster). When the scenario mentions 'natural disaster' or 'geographic area', think Multi-Region architecture.
Frequently Asked Questions
Why not just use multiple Availability Zones?
Does CloudFront provide high availability for EC2?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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ShaiTay 👍 1 Answered AA. Use EC2 instances in multiple AWS Regions. - This is the best option to ensure high availability if there is a natural disaster in one geographical area.
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Meow7 👍 1A is correct. please help with discussion on 473~476
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Naantje 👍 1A is Correct. Question: 147
Reader comments & corrections
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