← SOA-C02·Amazon Web Services

Question 635 of 1,546

Cost and Performance Optimization →hardMultiple ChoiceObjective-mapped

SOA-C02 Cost and Performance Optimization Practice Question

This SOA-C02 practice question tests your understanding of cost and performance optimization. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A company uses AWS Lambda functions to process messages from an SQS queue. The Lambda function is configured with a reserved concurrency of 100. The SQS queue receives unpredictable spikes of up to 10,000 messages per second. The function takes about 1 second to process a message. The SysOps team notices that during spikes, messages are being throttled and appear in the DLQ. How can the team resolve this while optimizing cost?

A
Reduce the reserved concurrency to 10 to force the function to process messages more slowly.
Why wrong: This would increase throttling and DLQ messages.
B
Increase reserved concurrency to 1000 and enable batch processing with a batch size of 10 in the SQS event source mapping.
Higher concurrency allows handling spikes, batch processing reduces invocations.
C
Provision an EC2 fleet to poll the SQS queue and invoke the Lambda function.
Why wrong: This adds complexity and cost, defeating serverless benefits.
D
Increase the Lambda function memory and timeout to use a larger instance type.
Why wrong: Larger instances may not help with concurrency limits and increase cost.

Full breakdown with real-world context →

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

✓

Increase reserved concurrency to 1000 and enable batch processing with a batch size of 10 in the SQS event source mapping.

Option B is correct because increasing reserved concurrency to 1000 allows the Lambda function to scale to handle the spike of 10,000 messages per second, and enabling batch processing with a batch size of 10 reduces the number of invocations, which optimizes cost by processing up to 10 messages per invocation instead of one. Option A is wrong because reducing reserved concurrency would throttle even more messages, increasing DLQ traffic. Option C is wrong because using EC2 adds operational overhead and does not leverage Lambda's serverless scaling, increasing complexity and cost. Option D is wrong because Lambda does not use instance types; memory and timeout adjustments do not directly address concurrency limitations or batch processing.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Reduce the reserved concurrency to 10 to force the function to process messages more slowly.
Why it's wrong here
This would increase throttling and DLQ messages.
✓
Increase reserved concurrency to 1000 and enable batch processing with a batch size of 10 in the SQS event source mapping.
Why this is correct
Higher concurrency allows handling spikes, batch processing reduces invocations.
Related concept
Read the scenario before looking for a memorised answer.
✗
Provision an EC2 fleet to poll the SQS queue and invoke the Lambda function.
Why it's wrong here
This adds complexity and cost, defeating serverless benefits.
✗
Increase the Lambda function memory and timeout to use a larger instance type.
Why it's wrong here
Larger instances may not help with concurrency limits and increase cost.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

Visual reference

Quick reference

Cloud Service Model Comparison

Model	You Manage	Provider Manages	Examples
IaaS	OS, runtime, apps, data	Hardware, hypervisor, networking	EC2, Azure VMs, GCP Compute Engine
PaaS	Apps and data	OS, runtime, middleware, hardware	Elastic Beanstalk, Azure App Service
SaaS	Data and settings only	Everything else	Microsoft 365, Salesforce, Workday
FaaS / Serverless	Function code only	Infra, scaling, runtime	Lambda, Azure Functions, Cloud Run
CaaS	Containers and apps	Kubernetes, OS, hardware	EKS, AKS, GKE

What to study next

Got this wrong? Here's your next step.

Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Cost and Performance Optimization — This question tests Cost and Performance Optimization — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Increase reserved concurrency to 1000 and enable batch processing with a batch size of 10 in the SQS event source mapping. — Option B is correct because increasing reserved concurrency to 1000 allows the Lambda function to scale to handle the spike of 10,000 messages per second, and enabling batch processing with a batch size of 10 reduces the number of invocations, which optimizes cost by processing up to 10 messages per invocation instead of one. Option A is wrong because reducing reserved concurrency would throttle even more messages, increasing DLQ traffic. Option C is wrong because using EC2 adds operational overhead and does not leverage Lambda's serverless scaling, increasing complexity and cost. Option D is wrong because Lambda does not use instance types; memory and timeout adjustments do not directly address concurrency limitations or batch processing.

What should I do if I get this SOA-C02 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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