← SOA-C02·Amazon Web Services

Question 486 of 1,546

Networking and Content Delivery →hardMultiple ChoiceObjective-mapped

SOA-C02 Networking and Content Delivery Practice Question

This SOA-C02 practice question tests your understanding of networking and content delivery. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Amazon CloudFront to distribute content to users worldwide. The origin is an Application Load Balancer (ALB) that routes to EC2 instances. The SysOps administrator notices that some users are receiving cached responses even though the content has been updated on the origin. The administrator needs to ensure that users always receive the latest version of the content. What should the administrator do?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.

A
Configure the ALB to send a Cache-Control: no-cache header.
Why wrong: Setting Cache-Control: no-cache on the ALB would force CloudFront to revalidate each request with the origin, but it does not invalidate already cached objects and increases origin load.
B
Set up a Lambda@Edge function to change the origin request path.
Why wrong: Lambda@Edge can modify origin requests, but changing the request path does not force CloudFront to fetch new content unless the path is versioned; it does not invalidate existing cache.
C
Use CloudFront cache invalidation to remove the old objects after updating the origin.
CloudFront cache invalidation removes specified objects from edge caches, ensuring subsequent requests fetch the updated content from the origin.
D
Reduce the CloudFront TTL to 0 seconds.
Why wrong: Setting TTL to 0 seconds causes CloudFront to treat all objects as expired immediately, but it does not actively invalidate cached objects and leads to constant origin fetches.

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 CloudFront cache invalidation to remove the old objects after updating the origin.

To ensure users always receive the latest content after updating the origin, the most effective method in CloudFront is to create a cache invalidation request to remove the old cached objects. The other options are not appropriate: Option A (sending Cache-Control: no-cache from the ALB) would require CloudFront to always revalidate with the origin, which increases load and latency, and does not affect existing cached objects. Option B (using Lambda@Edge to change the origin request path) could be used for versioned URLs, but simply changing the path does not invalidate existing cache. Option D (reducing TTL to 0 seconds) would cause all requests to go to the origin, defeating the purpose of CloudFront and increasing origin load, and still does not clear existing cached objects.

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.

✗
Configure the ALB to send a Cache-Control: no-cache header.
Why it's wrong here
Setting Cache-Control: no-cache on the ALB would force CloudFront to revalidate each request with the origin, but it does not invalidate already cached objects and increases origin load.
✗
Set up a Lambda@Edge function to change the origin request path.
Why it's wrong here
Lambda@Edge can modify origin requests, but changing the request path does not force CloudFront to fetch new content unless the path is versioned; it does not invalidate existing cache.
✓
Use CloudFront cache invalidation to remove the old objects after updating the origin.
Why this is correct
CloudFront cache invalidation removes specified objects from edge caches, ensuring subsequent requests fetch the updated content from the origin.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reduce the CloudFront TTL to 0 seconds.
Why it's wrong here
Setting TTL to 0 seconds causes CloudFront to treat all objects as expired immediately, but it does not actively invalidate cached objects and leads to constant origin fetches.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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?

Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use CloudFront cache invalidation to remove the old objects after updating the origin. — To ensure users always receive the latest content after updating the origin, the most effective method in CloudFront is to create a cache invalidation request to remove the old cached objects. The other options are not appropriate: Option A (sending Cache-Control: no-cache from the ALB) would require CloudFront to always revalidate with the origin, which increases load and latency, and does not affect existing cached objects. Option B (using Lambda@Edge to change the origin request path) could be used for versioned URLs, but simply changing the path does not invalidate existing cache. Option D (reducing TTL to 0 seconds) would cause all requests to go to the origin, defeating the purpose of CloudFront and increasing origin load, and still does not clear existing cached objects.

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

Are there clue words in this question I should notice?

Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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