CLF-C02 Cloud Concepts Practice Question
A company deploys their web application across multiple isolated locations within the same AWS Region, each with independent power, cooling, and networking. This design ensures that a failure in one location does not affect the others. What are these isolated locations called?
⚠ Common exam trap
It's easy for candidates to confuse Availability Zones with AWS Regions, thinking that any isolated location must be a different Region, but the question explicitly states 'within the same AWS Region,' which points directly to Availability Zones.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Availability Zones
Availability Zones (AZs) are isolated locations within an AWS Region that consist of one or more data centers with independent power, cooling, and networking. This design ensures that a failure in one AZ does not affect the others, providing high availability and fault tolerance for applications. The scenario directly describes the defining characteristics of an Availability Zone.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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AWS Regions
Why it's wrong here
An AWS Region is a large geographic area that contains two or more Availability Zones, but it is too coarse a granularity for the fault-isolation scenario in question. Within a single Region, AZs are independent data centers with isolated power, cooling, and networking, which is exactly what allows you to survive a data-center failure. Choosing multiple Regions would be necessary for disaster recovery across geographic areas, but the question specifically asks about isolated locations within the same Region—the Availability Zones.
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Availability Zones
Why this is correct
AZs are one or more discrete data centres within a Region, each with independent power, cooling, and networking. Deploying across multiple AZs means a failure in one AZ does not affect workloads in the others.
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Edge Locations
Why it's wrong here
Edge locations are AWS's global network of caching endpoints for Amazon CloudFront, designed to reduce latency by serving cached copies of content. They support limited edge functions like Lambda@Edge but are not general-purpose compute or storage environments where you can deploy a full web application. Edge locations do not provide the same infrastructure-level fault isolation or service-level commitments as Availability Zones, and they are not intended for hosting persistent workloads.
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VPC Subnets
Why it's wrong here
A VPC subnet is a logical boundary for IP address management and routing, not a physical data center. Although each subnet is tied to a specific Availability Zone, the subnet itself has no independent power, cooling, or hardware—it merely defines which AZ's resources your instances use. Fault isolation is achieved by the physical separation of AZs, not by the subnet abstraction, so selecting subnets is the method but not the source of fault tolerance.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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