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Question 370 of 1,546

Deployment, Provisioning, and Automation →hardMultiple 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 uses AWS CloudFormation to deploy a stack that includes an Amazon RDS DB instance with Multi-AZ enabled. During a stack update, the database engine version is changed. The update fails with a rollback. What is the most likely cause?

Clue words in this question

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

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The engine version upgrade is not supported for Multi-AZ deployments.
Some engine version upgrades are not supported directly; they may require a manual process.
B
The DB instance class is not available for the new engine version.
Why wrong: The instance class is not changed.
C
The storage type is not compatible with the new engine version.
Why wrong: The storage type is not mentioned; engine version changes typically don't affect storage type compatibility.
D
The DB subnet group does not have enough IP addresses.
Why wrong: Subnet group IP addresses are not related to engine version upgrades.

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

✓

The engine version upgrade is not supported for Multi-AZ deployments.

Option A is correct because changing the database engine version on a Multi-AZ RDS instance is not supported directly through a CloudFormation stack update without additional steps. Multi-AZ deployments require both primary and standby instances to be upgraded, and if the new engine version is not compatible or the upgrade path is not supported, the update fails and triggers a rollback. Option B is incorrect because instance class availability is not the primary issue; the error relates to the engine version change, not the instance class. Option C is incorrect because storage type compatibility is not the relevant factor; the storage type remains unchanged. Option D is incorrect because the DB subnet group is not involved in engine version upgrades, and IP address availability is not a typical cause for this failure.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

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

✓
The engine version upgrade is not supported for Multi-AZ deployments.
Why this is correct
Some engine version upgrades are not supported directly; they may require a manual process.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
The DB instance class is not available for the new engine version.
Why it's wrong here
The instance class is not changed.
✗
The storage type is not compatible with the new engine version.
Why it's wrong here
The storage type is not mentioned; engine version changes typically don't affect storage type compatibility.
✗
The DB subnet group does not have enough IP addresses.
Why it's wrong here
Subnet group IP addresses are not related to engine version upgrades.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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.

Visual reference

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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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 — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The engine version upgrade is not supported for Multi-AZ deployments. — Option A is correct because changing the database engine version on a Multi-AZ RDS instance is not supported directly through a CloudFormation stack update without additional steps. Multi-AZ deployments require both primary and standby instances to be upgraded, and if the new engine version is not compatible or the upgrade path is not supported, the update fails and triggers a rollback. Option B is incorrect because instance class availability is not the primary issue; the error relates to the engine version change, not the instance class. Option C is incorrect because storage type compatibility is not the relevant factor; the storage type remains unchanged. Option D is incorrect because the DB subnet group is not involved in engine version upgrades, and IP address availability is not a typical cause for this failure.

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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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