← SOA-C02·Amazon Web Services

Question 493 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 runs a critical web application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application is deployed in a single AWS region. The company wants to improve performance for users in other regions and reduce the load on the origin servers. The SysOps administrator decides to use Amazon CloudFront. After implementing CloudFront, the administrator notices that the cache hit ratio is very low (around 10%) for the dynamic API responses that are served by the application. These API responses are personalized per user and change frequently. The administrator wants to improve performance for these dynamic requests while still using CloudFront. The application uses cookies for session management and the API responses depend on the user's session. The administrator must ensure that users receive the correct personalized content. Which configuration should the administrator use?

A
Use Lambda@Edge to generate personalized responses at the edge without forwarding all requests to the origin.
Use Lambda@Edge to generate personalized responses at the edge. This allows dynamic content to be served from the edge without requiring a round trip to the origin, improving performance while maintaining correctness. It directly addresses the low cache hit ratio by avoiding caching altogether for personalized content.
B
Configure CloudFront to use origin shield and enable keep-alive connections to the origin.
Why wrong: Configuring Origin Shield and keep-alive connections can improve efficiency for cacheable content but does not help with dynamic, non-cacheable responses. Origin Shield adds an additional layer that may increase latency for cache misses and does not solve the issue of personalization.
C
Configure CloudFront to forward cookies to the origin and enable caching based on cookies.
Why wrong: Forwarding cookies and enabling caching based on cookies would result in a separate cache entry per user session, leading to many cache misses and very low cache hit ratio. This would not improve performance and could increase complexity.
D
Disable caching for the API behavior in CloudFront and enable real-time logs.
Why wrong: Disabling caching and enabling real-time logs would send all requests to the origin, increasing load and not improving performance. Real-time logs are for monitoring, not performance enhancement.

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

✓

Use Lambda@Edge to generate personalized responses at the edge without forwarding all requests to the origin.

For dynamic, personalized API responses that depend on user session cookies, caching is ineffective because each user's response is unique. Lambda@Edge allows you to run code at CloudFront edge locations to generate personalized responses or modify requests/responses. By using a Lambda function that inspects the session cookie and generates the appropriate API response at the edge, you can serve personalized content without forwarding every request to the origin. This improves performance by reducing round trips and origin load while ensuring users receive correct personalized content. Options B, C, and D do not effectively address the need for dynamic personalization with low cache hit ratio.

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.

✓
Use Lambda@Edge to generate personalized responses at the edge without forwarding all requests to the origin.
Why this is correct
Use Lambda@Edge to generate personalized responses at the edge. This allows dynamic content to be served from the edge without requiring a round trip to the origin, improving performance while maintaining correctness. It directly addresses the low cache hit ratio by avoiding caching altogether for personalized content.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure CloudFront to use origin shield and enable keep-alive connections to the origin.
Why it's wrong here
Configuring Origin Shield and keep-alive connections can improve efficiency for cacheable content but does not help with dynamic, non-cacheable responses. Origin Shield adds an additional layer that may increase latency for cache misses and does not solve the issue of personalization.
✗
Configure CloudFront to forward cookies to the origin and enable caching based on cookies.
Why it's wrong here
Forwarding cookies and enabling caching based on cookies would result in a separate cache entry per user session, leading to many cache misses and very low cache hit ratio. This would not improve performance and could increase complexity.
✗
Disable caching for the API behavior in CloudFront and enable real-time logs.
Why it's wrong here
Disabling caching and enabling real-time logs would send all requests to the origin, increasing load and not improving performance. Real-time logs are for monitoring, not performance enhancement.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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.

Related SOA-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Monitoring, Logging, and Remediation practice questions

Practise SOA-C02 questions linked to Monitoring, Logging, and Remediation.

Reliability and Business Continuity practice questions

Practise SOA-C02 questions linked to Reliability and Business Continuity.

Deployment, Provisioning, and Automation practice questions

Practise SOA-C02 questions linked to Deployment, Provisioning, and Automation.

Security and Compliance practice questions

Practise SOA-C02 questions linked to Security and Compliance.

Networking and Content Delivery practice questions

Practise SOA-C02 questions linked to Networking and Content Delivery.

Cost and Performance Optimization practice questions

Practise SOA-C02 questions linked to Cost and Performance Optimization.

SOA-C02 fundamentals practice questions

Practise SOA-C02 questions linked to SOA-C02 fundamentals.

SOA-C02 scenario practice questions

Practise SOA-C02 questions linked to SOA-C02 scenario.

SOA-C02 troubleshooting practice questions

Practise SOA-C02 questions linked to SOA-C02 troubleshooting.

Practice this exam

Start a free SOA-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

SOA-C02 practice-test guide →Study guide →Browse all practice tests

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: Use Lambda@Edge to generate personalized responses at the edge without forwarding all requests to the origin. — For dynamic, personalized API responses that depend on user session cookies, caching is ineffective because each user's response is unique. Lambda@Edge allows you to run code at CloudFront edge locations to generate personalized responses or modify requests/responses. By using a Lambda function that inspects the session cookie and generates the appropriate API response at the edge, you can serve personalized content without forwarding every request to the origin. This improves performance by reducing round trips and origin load while ensuring users receive correct personalized content. Options B, C, and D do not effectively address the need for dynamic personalization with low cache hit ratio.

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This SOA-C02 practice question is part of Courseiva's free Amazon Web Services 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 SOA-C02 exam.