hardMultiple ChoiceObjective-mapped
CV0-004 Practice Question: Deploying a multi-tier application with web…
A company is deploying a multi-tier application with web servers and a database. Which architecture ensures high availability?
⚠ Common exam trap
It's easy for candidates to assume auto-scaling alone guarantees high availability, but without distributing instances across multiple AZs, a single AZ failure still causes downtime.
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 web servers in an auto-scaling group across two AZs and database in a multi-AZ configuration
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.
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.
- ✗
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.
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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.