← SOA-C02·Amazon Web Services

Question 232 of 1,546

Deployment, Provisioning, and Automation →mediumMultiple ChoiceObjective-mapped

SOA-C02 Deployment, Provisioning, and Automation Practice Question

This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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 legacy application that runs on a single Amazon EC2 instance. The SysOps administrator is tasked with migrating the application to an Auto Scaling group behind an Application Load Balancer to improve availability. The application stores session state locally on the instance. What should the administrator do to ensure a seamless migration with minimal changes to the application code?

A
Configure the Application Load Balancer with sticky sessions (session affinity).
Why wrong: Sticky sessions (session affinity) keep a user's requests routed to the same instance, but if that instance fails, the session data is lost because it is still stored locally. This does not eliminate the dependency on local storage.
B
Disable the feature that stores session state locally.
Why wrong: Simply disabling local session storage does not solve the problem because the application still needs persistent session storage. Without an alternative, sessions will be lost.
C
Use Amazon ElastiCache for Redis to store session data externally.
Amazon ElastiCache for Redis provides a fast, in-memory data store that can hold session data externally. This makes the application stateless, allowing any instance in the Auto Scaling group to handle requests without losing session data. Requires minimal code changes.
D
Modify the application to store session data in an Amazon RDS database.
Why wrong: Amazon RDS can store session data, but it is not optimized for session caching. It typically results in higher latency and requires more significant code and schema changes compared to Redis, making it a less suitable choice.

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 ElastiCache for Redis to store session data externally.

Option C is correct because using Amazon ElastiCache for Redis to store session data externally allows the application to be stateless, enabling seamless scaling across multiple EC2 instances in an Auto Scaling group. This approach requires minimal code changes (typically just configuring the application to use a Redis endpoint instead of local storage) and ensures session data is not lost if an instance fails. Option A (sticky sessions) is a workaround but does not eliminate the dependency on local storage; sessions are still lost if an instance fails. Option B (disabling local session storage) does not solve the problem because the application still needs persistent session storage. Option D (using RDS) is possible but is not the best choice for session data because relational databases are typically slower for session caching and require more significant code and schema changes compared to Redis, which is an in-memory data store optimized for session management.

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 Application Load Balancer with sticky sessions (session affinity).
Why it's wrong here
Sticky sessions (session affinity) keep a user's requests routed to the same instance, but if that instance fails, the session data is lost because it is still stored locally. This does not eliminate the dependency on local storage.
✗
Disable the feature that stores session state locally.
Why it's wrong here
Simply disabling local session storage does not solve the problem because the application still needs persistent session storage. Without an alternative, sessions will be lost.
✓
Use Amazon ElastiCache for Redis to store session data externally.
Why this is correct
Amazon ElastiCache for Redis provides a fast, in-memory data store that can hold session data externally. This makes the application stateless, allowing any instance in the Auto Scaling group to handle requests without losing session data. Requires minimal code changes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Modify the application to store session data in an Amazon RDS database.
Why it's wrong here
Amazon RDS can store session data, but it is not optimized for session caching. It typically results in higher latency and requires more significant code and schema changes compared to Redis, making it a less suitable choice.

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.

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?

Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use Amazon ElastiCache for Redis to store session data externally. — Option C is correct because using Amazon ElastiCache for Redis to store session data externally allows the application to be stateless, enabling seamless scaling across multiple EC2 instances in an Auto Scaling group. This approach requires minimal code changes (typically just configuring the application to use a Redis endpoint instead of local storage) and ensures session data is not lost if an instance fails. Option A (sticky sessions) is a workaround but does not eliminate the dependency on local storage; sessions are still lost if an instance fails. Option B (disabling local session storage) does not solve the problem because the application still needs persistent session storage. Option D (using RDS) is possible but is not the best choice for session data because relational databases are typically slower for session caching and require more significant code and schema changes compared to Redis, which is an in-memory data store optimized for session management.

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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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.