CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 its on-premises application to the cloud and needs to ensure high availability. The application requires a stateless web tier and a stateful database tier. Which design approach BEST meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 behind a load balancer and use a managed database with multi-AZ replication.
Option B is correct because deploying web servers behind a load balancer provides horizontal scaling and fault tolerance for the stateless web tier, while using a managed database with multi-AZ replication ensures automatic failover and data durability for the stateful database tier. This combination meets high availability requirements by eliminating single points of failure and providing redundancy across Availability Zones.
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 one large web server and one large database server.
Why it's wrong here
Single instances are single points of failure.
✓
Deploy web servers behind a load balancer and use a managed database with multi-AZ replication.
Why this is correct
Provides redundancy for both tiers.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use round-robin DNS for web servers and a read replica for the database.
Why it's wrong here
Round-robin DNS does not handle failures; read replica is not for failover.
✗
Use auto-scaling for web servers and a single database instance.
Why it's wrong here
Single database instance is not highly available.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that round-robin DNS or a single read replica provides high availability, but candidates must recognize that DNS-based load balancing lacks health checking and automatic failover, and a read replica cannot handle write failures, making multi-AZ replication essential for database high availability.
Detailed technical explanation
How to think about this question
In a multi-AZ deployment, the managed database synchronously replicates data to a standby instance in a different Availability Zone; if the primary fails, AWS RDS automatically fails over to the standby with a DNS change, typically within 60-120 seconds. The load balancer (e.g., ALB) performs health checks on web servers and distributes traffic only to healthy instances, supporting session persistence via cookies if needed, though the stateless tier avoids this requirement. This architecture aligns with the AWS Well-Architected Framework's Reliability Pillar, which recommends deploying across multiple Availability Zones to withstand zone failures.
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.
Cloud Architecture and Design — This question tests Cloud Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy web servers behind a load balancer and use a managed database with multi-AZ replication. — Option B is correct because deploying web servers behind a load balancer provides horizontal scaling and fault tolerance for the stateless web tier, while using a managed database with multi-AZ replication ensures automatic failover and data durability for the stateful database tier. This combination meets high availability requirements by eliminating single points of failure and providing redundancy across Availability Zones.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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