Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Exhibit
Architecture inventory: 3 EC2 instances for RabbitMQ 2 EC2 instances for application workers Average broker CPU: 8%-12% Average broker memory: 18%-22% Monthly ops time spent on broker patching, backups, and failover testing: 14 hours Message requirements: Durable queueing At-least-once delivery acceptable No need for broker-managed topics or complex routing Failure note: A node reboot caused a 9-minute enqueue outage last month
Based on the exhibit, the company runs a self-managed RabbitMQ cluster on EC2 for asynchronous work. The queue only needs durable at-least-once delivery, and the application does not require AMQP-specific features such as exchanges, routing keys, or broker plugins. Which change is the best cost-optimization move?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Replace RabbitMQ with Amazon SQS Standard and keep the workers unchanged except for the queue client library.
Amazon SQS is a fully managed queue that satisfies durable, at-least-once messaging without requiring broker administration. It removes the EC2 broker fleet, patching, backups, and failover testing, and it reduces outage risk from broker maintenance. Because the workload does not need AMQP-specific features such as exchanges or routing keys, SQS is the most cost-effective and operationally simple replacement.
B
Distractor review
Replace RabbitMQ with Amazon MQ for RabbitMQ to keep the same protocol and reduce costs.
Amazon MQ reduces some administration effort, but it is still a broker service with broker-related costs. For a workload that does not need AMQP-specific features, SQS is typically cheaper and simpler because it removes the broker layer entirely.
C
Distractor review
Increase the RabbitMQ instance size and add a fourth node for higher availability.
The exhibit shows very low CPU and memory utilization, so scaling the cluster up would raise cost without addressing the underlying self-managed broker overhead. It also does not eliminate the patching, backup, and failover-testing burden.
D
Distractor review
Move the queue to Amazon DynamoDB and use scans for consumers to detect new messages.
DynamoDB is not a queue service, and scanning it for work items is inefficient and expensive at scale. This would add complexity and would not provide the same messaging semantics as a real queue.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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Question 2
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Replace RabbitMQ with Amazon SQS Standard and keep the workers unchanged except for the queue client library. — The workload only requires durable at-least-once delivery and does not depend on AMQP-specific broker features, so Amazon SQS Standard is the best fit. It removes the self-managed RabbitMQ fleet and the operational work of patching, backups, and failover testing. That lowers both direct infrastructure cost and the hidden operational cost of maintaining a broker cluster, while also eliminating the outage pattern caused by node maintenance or failure. Amazon MQ is useful when protocol compatibility matters, but that is not needed here. Scaling RabbitMQ up increases cost and complexity without fixing the fundamental self-managed overhead. DynamoDB is not a queue and does not provide an appropriate messaging model for this requirement.
What should I do if I get this SAA-C03 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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