This CV0-004 practice question tests your understanding of deployment. 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 deploying a multi-tier application with web servers and a database. Which architecture ensures high availability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy web servers in an auto-scaling group across two AZs and database in a multi-AZ configuration
Option A is correct because deploying web servers in an auto-scaling group across two Availability Zones (AZs) ensures that if one AZ fails, the other continues serving traffic, while a multi-AZ database configuration (e.g., Amazon RDS Multi-AZ) automatically synchronously replicates data to a standby instance in a different AZ, enabling automatic failover. This combination eliminates single points of failure at both the web and database tiers, meeting high availability requirements.
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 web servers in an auto-scaling group across two AZs and database in a multi-AZ configuration
Why this is correct
This provides redundancy for both web and database tiers.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy a single large web server and a single database instance
Why it's wrong here
No redundancy at either tier.
✗
Deploy web servers in an auto-scaling group in one AZ and database in single instance
Why it's wrong here
Database is a single point of failure.
✗
Deploy web servers and database in a single availability zone
Why it's wrong here
A single zone risks total outage if the zone fails.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume auto-scaling alone guarantees high availability, but without distributing instances across multiple AZs, a single AZ failure still causes downtime.
Detailed technical explanation
How to think about this question
In a multi-AZ database configuration, synchronous replication is used to maintain a standby replica in a secondary AZ, with automatic failover typically completing within 60–120 seconds; the database endpoint remains unchanged, so application connections are transparently redirected. Auto-scaling groups distribute instances across AZs using a load balancer (e.g., ALB) that performs health checks and routes traffic only to healthy instances, ensuring that even during a gradual scale-in or AZ failure, capacity is maintained.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy web servers in an auto-scaling group across two AZs and database in a multi-AZ configuration — Option A is correct because deploying web servers in an auto-scaling group across two Availability Zones (AZs) ensures that if one AZ fails, the other continues serving traffic, while a multi-AZ database configuration (e.g., Amazon RDS Multi-AZ) automatically synchronously replicates data to a standby instance in a different AZ, enabling automatic failover. This combination eliminates single points of failure at both the web and database tiers, meeting high availability requirements.
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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