The correct answer is to use an auto-scaling group with a minimum of two instances spread across zones. This design ensures high availability across availability zones by distributing workload across physically separate, isolated data centers within a region, so if one zone fails, the other instance continues serving traffic without interruption. On the CompTIA Cloud+ CV0-004 exam, this principle tests your understanding of fault tolerance and redundancy at the infrastructure layer, often appearing in scenario-based questions where a single zone failure must not cause total application downtime. A common trap is choosing a single large instance in one zone or relying solely on load balancing without multi-zone distribution, which still creates a single point of failure. Remember the memory tip: “Two zones, two instances—never put all eggs in one data center basket.”
CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and design. 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 cloud architect is designing a multi-tier application that must remain available during a single Availability Zone failure. Which TWO design principles should the architect apply?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy resources across multiple Availability Zones.
Deploying resources across multiple Availability Zones (AZs) ensures that if one AZ fails, the application continues to run using resources in the other AZ(s). This is a fundamental principle of high availability in cloud architecture, as AZs are isolated from each other's failures. Option E complements this by using an auto-scaling group with a minimum of two instances spread across zones, which maintains capacity even if one instance or AZ fails.
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.
✗
Implement synchronous replication between the primary site and a DR site.
Why it's wrong here
This does not protect against an Availability Zone failure within the primary region.
✓
Deploy resources across multiple Availability Zones.
Why this is correct
This provides redundancy if one zone fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a single load balancer to distribute traffic across instances.
Why it's wrong here
A single load balancer is a single point of failure.
✗
Place all application servers in the same subnet for low latency.
Why it's wrong here
Placing all servers in one subnet creates a single point of failure.
✓
Use an auto-scaling group with a minimum of two instances spread across zones.
Why this is correct
This ensures capacity is maintained even if one zone fails.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between high availability (within a region across AZs) and disaster recovery (across regions), leading candidates to mistakenly choose synchronous replication (Option A) for AZ failure scenarios when it is actually designed for regional outages.
Detailed technical explanation
How to think about this question
Availability Zones are physically separate data centers within a region, each with independent power, cooling, and networking. When you deploy an Auto Scaling group across multiple AZs, the group automatically distributes instances and can replace failed instances in another AZ. Under the hood, AWS uses Elastic Load Balancing (ELB) health checks to route traffic only to healthy instances, and the Auto Scaling group's minimum size ensures that the desired capacity is maintained even if an entire AZ becomes unavailable.
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.
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 resources across multiple Availability Zones. — Deploying resources across multiple Availability Zones (AZs) ensures that if one AZ fails, the application continues to run using resources in the other AZ(s). This is a fundamental principle of high availability in cloud architecture, as AZs are isolated from each other's failures. Option E complements this by using an auto-scaling group with a minimum of two instances spread across zones, which maintains capacity even if one instance or AZ fails.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
easy
A.Deploy one large web server and one large database server.
✓ B.Deploy web servers behind a load balancer and use a managed database with multi-AZ replication.
C.Use round-robin DNS for web servers and a read replica for the database.
D.Use auto-scaling for web servers and a single database instance.
Why B: 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.
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This CV0-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CV0-004 exam.
Question Discussion
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