CV0-004 Operations and Support Practice Question
A cloud administrator is setting up auto-scaling for a web application that uses an SQS queue for incoming requests. The administrator wants to scale the number of EC2 instances based on the queue depth. Which two metrics are appropriate for this auto-scaling policy? (Choose TWO.)
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
✓
ApproximateNumberOfMessagesVisible (queue depth)
SQS queue depth (ApproximateNumberOfMessagesVisible) is a common metric. CPU utilization of instances is also relevant but not directly queue-related. The correct ones are ApproximateNumberOfMessagesVisible and BacklogPerInstance (which combines queue depth and instance count).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CPU utilization of instances
Why it's wrong here
CPU utilization is not directly related to queue depth.
- ✓
ApproximateNumberOfMessagesVisible (queue depth)
Why this is correct
This is the direct metric for the number of messages in the queue.
- ✗
Memory utilization of instances
Why it's wrong here
Memory is not a direct indicator of queue load.
- ✗
Network throughput
Why it's wrong here
Network throughput is not a standard metric for queue-based scaling.
- ✓
BacklogPerInstance (queue depth per instance)
Why this is correct
This metric helps determine how many instances are needed based on queue depth.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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