This CV0-004 practice question tests your understanding of operations and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 migrating to the cloud and needs to ensure high availability for a web application. The solution must tolerate the failure of an entire Availability Zone. Which three actions should the administrator take? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy the application across two or more Availability Zones.
Option A is correct because deploying the application across two or more Availability Zones (AZs) ensures that if an entire AZ fails, the application remains available in the other AZ(s). This is a fundamental design pattern for achieving high availability in AWS, as AZs are physically separate data centers with independent power, cooling, and networking. By distributing resources across multiple AZs, the application can tolerate the failure of one AZ without service interruption.
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.
✓
Deploy the application across two or more Availability Zones.
Why this is correct
This is fundamental to survive an AZ failure.
Related concept
Read the scenario before looking for a memorised answer.
✓
Implement auto scaling with a minimum of one instance per AZ.
Why this is correct
This ensures that each AZ has at least one instance running.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an Application Load Balancer with cross-zone load balancing enabled.
Why it's wrong here
ALB already routes to healthy targets across AZs; cross-zone balancing is for distributing traffic within each AZ, not for AZ failure.
✗
Use a single instance in a larger instance size.
Why it's wrong here
This creates a single point of failure and does not provide AZ resilience.
✓
Use a Multi-AZ RDS database.
Why this is correct
Multi-AZ RDS provides automatic failover to a standby in another AZ.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse cross-zone load balancing (which optimizes traffic distribution) with the fundamental requirement of deploying resources across multiple AZs to achieve AZ failure tolerance, leading them to select option C as a necessary action when it is actually a default or optional feature that does not by itself provide AZ redundancy.
Detailed technical explanation
How to think about this question
Under the hood, AWS Availability Zones are isolated from each other to prevent cascading failures, with independent power grids and network connectivity. When deploying across multiple AZs, the application must use a load balancer (like ALB or NLB) that can detect AZ failures via health checks and reroute traffic to healthy AZs. In a real-world scenario, if an AZ experiences a power outage, the load balancer's health checks will mark instances in that AZ as unhealthy, and traffic will be directed only to the remaining AZs, ensuring continuous availability.
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
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the application across two or more Availability Zones. — Option A is correct because deploying the application across two or more Availability Zones (AZs) ensures that if an entire AZ fails, the application remains available in the other AZ(s). This is a fundamental design pattern for achieving high availability in AWS, as AZs are physically separate data centers with independent power, cooling, and networking. By distributing resources across multiple AZs, the application can tolerate the failure of one AZ without service interruption.
What should I do if I get this CV0-004 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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Question Discussion
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