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CV0-004 Practice Question: Migrating to the cloud and needs to ensure high…
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.)
⚠ Common exam trap
Many candidates 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.
Answer choices
Why each option matters
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.
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.
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.
- ✓
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.