This CV0-004 practice question tests your understanding of troubleshooting. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 on-premises workloads to the cloud. They need to ensure high availability for a stateless web application across two availability zones. Which THREE components should be configured to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An auto scaling group spanning both availability zones
An auto scaling group spanning both availability zones (Option A) ensures that the stateless web application can automatically replace failed instances and maintain the desired capacity across multiple AZs, which is essential for high availability. By distributing instances across AZs, the application can tolerate an entire AZ failure without losing all compute capacity.
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.
✓
An auto scaling group spanning both availability zones
Why this is correct
Correct; auto scaling maintains instance count across AZs.
Related concept
Read the scenario before looking for a memorised answer.
✓
A load balancer in front of the web tier
Why this is correct
Correct; load balancer distributes traffic across AZs.
Related concept
Read the scenario before looking for a memorised answer.
✗
A read replica database in a different AZ
Why it's wrong here
Incorrect; stateless web app does not require database.
✗
A single large EC2 instance to handle all traffic
Why it's wrong here
Incorrect; single instance is a single point of failure.
✓
Multiple subnets, each in a different availability zone
Why this is correct
Correct; subnets in different AZs allow instances to be distributed.
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 database-level high availability (like read replicas or Multi-AZ RDS) with application-tier high availability, leading them to select a database option (C) when the question explicitly targets the stateless web tier.
Detailed technical explanation
How to think about this question
Under the hood, an auto scaling group uses health checks (e.g., EC2 status checks or Elastic Load Balancing health checks) to detect instance failures and automatically launches replacement instances in the same or different AZ based on the distribution strategy. When combined with a load balancer (Option B) and multiple subnets (Option E), traffic is distributed only to healthy instances, and the subnet-per-AZ design ensures network-level isolation and fault tolerance, aligning with AWS Well-Architected Framework best practices for high 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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An auto scaling group spanning both availability zones — An auto scaling group spanning both availability zones (Option A) ensures that the stateless web application can automatically replace failed instances and maintain the desired capacity across multiple AZs, which is essential for high availability. By distributing instances across AZs, the application can tolerate an entire AZ failure without losing all compute capacity.
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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