- A
Launch all EC2 instances in a single Availability Zone to ensure low latency between instances.
Why wrong: This is incorrect because a single Availability Zone can fail entirely if its data center suffers an outage. Placing all instances in one AZ creates a single point of failure and does not provide high availability.
- B
Deploy the EC2 instances across two or more Availability Zones within the us-east-1 Region.
This is correct. Availability Zones are physically separate data centers within a Region. Running instances in multiple AZs ensures that the application remains available if one AZ goes offline, because the other AZs continue operating. This is a standard best practice for high availability.
- C
Deploy the EC2 instances in multiple AWS Regions, such as us-east-1 and eu-west-1.
Why wrong: This is not the best answer for a data center outage. While multiple Regions protect against a Region-wide disaster, they introduce higher latency, complexity, and cost. The question specifies a data center failure within the same Region, which is best addressed by multiple Availability Zones, not multiple Regions.
- D
Use separate AWS accounts for each EC2 instance to isolate the workload from a data center failure.
Why wrong: This is incorrect because AWS accounts are administrative boundaries, not physical infrastructure isolation. Instances in different accounts could still reside in the same Availability Zone and would be affected by a data center outage. AWS account separation does not provide fault tolerance against infrastructure failures.
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is designing a critical web application that must remain available even if an entire data center goes offline due to a power outage. The application will run on Amazon EC2 instances in the us-east-1 Region. Which AWS infrastructure strategy should the company use to meet this high-availability requirement?
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
Deploy the EC2 instances across two or more Availability Zones within the us-east-1 Region.
Option B is correct because deploying EC2 instances across two or more Availability Zones (AZs) within a single AWS Region protects against an entire data center failure. Each AZ is physically separated, with independent power, cooling, and networking, so if one AZ goes offline, the application continues running in the other AZs. This design meets the high-availability requirement without the complexity and latency of multi-Region deployment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Launch all EC2 instances in a single Availability Zone to ensure low latency between instances.
Why it's wrong here
This is incorrect because a single Availability Zone can fail entirely if its data center suffers an outage. Placing all instances in one AZ creates a single point of failure and does not provide high availability.
When this WOULD be correct
If the requirement is to minimize inter-instance latency for a tightly coupled, latency-sensitive workload (e.g., high-frequency trading) and the application can tolerate a single point of failure, then placing all instances in one AZ would be correct.
- ✓
Deploy the EC2 instances across two or more Availability Zones within the us-east-1 Region.
Why this is correct
This is correct. Availability Zones are physically separate data centers within a Region. Running instances in multiple AZs ensures that the application remains available if one AZ goes offline, because the other AZs continue operating. This is a standard best practice for high availability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy the EC2 instances in multiple AWS Regions, such as us-east-1 and eu-west-1.
Why it's wrong here
This is not the best answer for a data center outage. While multiple Regions protect against a Region-wide disaster, they introduce higher latency, complexity, and cost. The question specifies a data center failure within the same Region, which is best addressed by multiple Availability Zones, not multiple Regions.
When this WOULD be correct
This option would be correct if the question required the application to remain available even if an entire AWS Region becomes unavailable (e.g., due to a regional disaster), and the application can tolerate cross-Region latency.
- ✗
Use separate AWS accounts for each EC2 instance to isolate the workload from a data center failure.
Why it's wrong here
This is incorrect because AWS accounts are administrative boundaries, not physical infrastructure isolation. Instances in different accounts could still reside in the same Availability Zone and would be affected by a data center outage. AWS account separation does not provide fault tolerance against infrastructure failures.
When this WOULD be correct
A company needs to isolate workloads for security or compliance reasons, such as separating development and production environments, or meeting regulatory requirements that mandate strict account-level boundaries. In that case, using separate AWS accounts would be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Deploy the EC2 instances across two or more Availability Zones within the us-east-1 Region.Correct answer▾
Why this is correct
This is correct. Availability Zones are physically separate data centers within a Region. Running instances in multiple AZs ensures that the application remains available if one AZ goes offline, because the other AZs continue operating. This is a standard best practice for high availability.
✗Launch all EC2 instances in a single Availability Zone to ensure low latency between instances.Wrong answer — click to see why▾
Why this is wrong here
Launching all EC2 instances in a single Availability Zone does not protect against an entire data center failure, as a power outage would affect that entire AZ, causing the application to become unavailable.
★ When this WOULD be the correct answer
If the requirement is to minimize inter-instance latency for a tightly coupled, latency-sensitive workload (e.g., high-frequency trading) and the application can tolerate a single point of failure, then placing all instances in one AZ would be correct.
Why candidates choose this
Candidates may think that a single AZ provides the lowest latency and assume that high availability can be achieved within one AZ, overlooking that AZs are isolated from each other's failures.
✗Deploy the EC2 instances in multiple AWS Regions, such as us-east-1 and eu-west-1.Wrong answer — click to see why▾
Why this is wrong here
Deploying across multiple Regions (e.g., us-east-1 and eu-west-1) introduces cross-Region latency and higher costs, and is unnecessary for protection against a single data center failure; the requirement is to survive an Availability Zone outage, not a full Region outage.
★ When this WOULD be the correct answer
This option would be correct if the question required the application to remain available even if an entire AWS Region becomes unavailable (e.g., due to a regional disaster), and the application can tolerate cross-Region latency.
Why candidates choose this
Candidates may think that multiple Regions provide the highest availability, overlooking that the question specifies a single data center failure, which is an Availability Zone issue, not a Region issue.
✗Use separate AWS accounts for each EC2 instance to isolate the workload from a data center failure.Wrong answer — click to see why▾
Why this is wrong here
Using separate AWS accounts does not protect against a data center failure because each account still operates within the same physical infrastructure and Availability Zones. A power outage affecting an entire data center would impact instances across accounts if they are in the same zone.
★ When this WOULD be the correct answer
A company needs to isolate workloads for security or compliance reasons, such as separating development and production environments, or meeting regulatory requirements that mandate strict account-level boundaries. In that case, using separate AWS accounts would be correct.
Why candidates choose this
Candidates may think that separate accounts provide physical isolation, similar to using different data centers, but AWS accounts are logical constructs that do not guarantee geographic or infrastructure separation.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Availability Zones with Regions, thinking that multi-Region deployment is required for high availability, when in fact deploying across multiple AZs within a single Region is sufficient and more cost-effective for surviving a data center failure.
Detailed technical explanation
How to think about this question
Under the hood, each Availability Zone is a distinct physical location with its own independent power grid, cooling, and network connectivity, connected to other AZs via low-latency, redundant fiber links. When using an Elastic Load Balancer (ALB or NLB) with cross-zone load balancing, traffic is automatically distributed across healthy instances in multiple AZs, and Auto Scaling groups can be configured to maintain a minimum number of instances per AZ. A real-world scenario: during the 2021 AWS us-east-1 Kinesis outage, applications deployed across multiple AZs remained available while single-AZ deployments failed.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Concepts — This question tests Cloud Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the EC2 instances across two or more Availability Zones within the us-east-1 Region. — Option B is correct because deploying EC2 instances across two or more Availability Zones (AZs) within a single AWS Region protects against an entire data center failure. Each AZ is physically separated, with independent power, cooling, and networking, so if one AZ goes offline, the application continues running in the other AZs. This design meets the high-availability requirement without the complexity and latency of multi-Region deployment.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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