CV0-004 Troubleshooting Practice Question
A company is migrating on-premises workloads to the cloud. They need to ensure high availability for a stateless web application across two availability zones. Which THREE components should be configured to meet this requirement?
⚠ Common exam trap
A common mix-up: candidates confuse database-level high availability (like read replicas or multi-AZ database replication) with application-tier high availability, leading them to select a database option (C) when the question explicitly targets the stateless web tier.
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
✓
An auto scaling group spanning both availability zones
An auto scaling group spanning both availability zones (Option A) ensures that the stateless web application can automatically replace failed instances and maintain the desired capacity across multiple AZs, which is essential for high availability. By distributing instances across AZs, the application can tolerate an entire AZ failure without losing all compute capacity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
An auto scaling group spanning both availability zones
Why this is correct
Correct; auto scaling maintains instance count across AZs.
- ✓
A load balancer in front of the web tier
Why this is correct
Correct; load balancer distributes traffic across AZs.
- ✗
A read replica database in a different AZ
Why it's wrong here
Incorrect; stateless web app does not require database.
- ✗
A single large compute instance to handle all traffic
Why it's wrong here
Incorrect; single instance is a single point of failure.
- ✓
Multiple subnets, each in a different availability zone
Why this is correct
Correct; subnets in different AZs allow instances to be distributed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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