← DOP-C02·Amazon Web Services

Question 1,603 of 1,750

Resilient Cloud Solutions →hardMultiple ChoiceObjective-mapped

Use Amazon EFS Instead of EBS for Regional Cache Persistence

This DOP-C02 practice question tests your understanding of resilient cloud solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 has a critical application running on EC2 instances in an Auto Scaling group across two Availability Zones. The application uses an EBS volume for local caching. The company wants to ensure that if an instance fails, the cache data is not lost and the replacement instance can use it. Which solution meets this requirement?

A
Configure the Auto Scaling group to use a launch template that attaches the same EBS volume to new instances
Why wrong: An EBS volume can only be attached to one instance at a time (unless Multi-Attach, which is limited).
B
Take periodic EBS snapshots and create a new volume from the snapshot for the replacement instance
Why wrong: Periodic snapshots may lose recent cache data.
C
Use an EBS Multi-Attach volume and attach it to all instances in the Auto Scaling group
Why wrong: Multi-Attach is limited to a single AZ and up to 16 instances; not suitable for cross-AZ.
D
Use Amazon EFS instead of EBS for the cache
EFS is a shared file system accessible across AZs and persists independently of instances.

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 Amazon EFS instead of EBS for the cache

Option D is correct because Amazon EFS is a regional, shared file system that can be mounted by EC2 instances across multiple Availability Zones. This ensures that cache data persists independently of instance lifecycle, so if an instance fails, a replacement instance can mount the same EFS file system and access the cached data without loss. Option A is incorrect because an EBS volume can only be attached to one instance at a time (except with Multi-Attach, which is limited to the same AZ) and is tied to a specific Availability Zone, making it unsuitable for an Auto Scaling group spanning two AZs. Additionally, automatically attaching a specific existing volume to new instances is not a standard Auto Scaling feature. Option B is incorrect because periodic snapshots are not real-time; data written between snapshots would be lost, and creating a new volume from a snapshot does not provide continuous access to the latest cache. Option C is incorrect because EBS Multi-Attach volumes can only be attached to instances within the same Availability Zone, so they cannot serve instances in both AZs of the Auto Scaling group.

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 Auto Scaling group to use a launch template that attaches the same EBS volume to new instances
Why it's wrong here
An EBS volume can only be attached to one instance at a time (unless Multi-Attach, which is limited).
✗
Take periodic EBS snapshots and create a new volume from the snapshot for the replacement instance
Why it's wrong here
Periodic snapshots may lose recent cache data.
✗
Use an EBS Multi-Attach volume and attach it to all instances in the Auto Scaling group
Why it's wrong here
Multi-Attach is limited to a single AZ and up to 16 instances; not suitable for cross-AZ.
✓
Use Amazon EFS instead of EBS for the cache
Why this is correct
EFS is a shared file system accessible across AZs and persists independently of instances.
Related concept
Read the scenario before looking for a memorised answer.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Identify which DOP-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 DOP-C02 question test?

Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use Amazon EFS instead of EBS for the cache — Option D is correct because Amazon EFS is a regional, shared file system that can be mounted by EC2 instances across multiple Availability Zones. This ensures that cache data persists independently of instance lifecycle, so if an instance fails, a replacement instance can mount the same EFS file system and access the cached data without loss. Option A is incorrect because an EBS volume can only be attached to one instance at a time (except with Multi-Attach, which is limited to the same AZ) and is tied to a specific Availability Zone, making it unsuitable for an Auto Scaling group spanning two AZs. Additionally, automatically attaching a specific existing volume to new instances is not a standard Auto Scaling feature. Option B is incorrect because periodic snapshots are not real-time; data written between snapshots would be lost, and creating a new volume from a snapshot does not provide continuous access to the latest cache. Option C is incorrect because EBS Multi-Attach volumes can only be attached to instances within the same Availability Zone, so they cannot serve instances in both AZs of the Auto Scaling group.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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