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Deployment, Provisioning, and Automation →easyMultiple 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 EC2 instances. The stack creation fails with the error 'Resource creation cancelled' after 20 minutes. 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 CloudFormation template uses an unsupported template format
Why wrong: Incorrect. CloudFormation supports both JSON and YAML template formats. An unsupported format would cause a validation error during stack creation, not a timeout after 20 minutes.
B
The EC2 instance creation exceeded the CloudFormation timeout
Correct. CloudFormation has a default timeout of 20 minutes for EC2 instance creation. If the instance creation exceeds this timeout, CloudFormation cancels the resource creation, giving the 'Resource creation cancelled' error.
C
The instance type specified is not available in the chosen Availability Zone
Why wrong: Incorrect. If the instance type is not available in the chosen Availability Zone, CloudFormation would receive an immediate API error (e.g., 'InvalidInstanceType' or 'InsufficientInstanceCapacity'), not a timeout after 20 minutes.
D
Insufficient IAM permissions for CloudFormation to create EC2 instances
Why wrong: Incorrect. Insufficient IAM permissions would cause an authorization error (e.g., 'Access Denied' when trying to create the EC2 instance) at the start of the creation process, not a cancellation after 20 minutes.

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 EC2 instance creation exceeded the CloudFormation timeout

Option B is correct because CloudFormation has a default timeout of 20 minutes for EC2 instance creation. If the instance creation takes longer than the timeout, CloudFormation cancels the resource creation, resulting in the 'Resource creation cancelled' error. Option A is incorrect because an unsupported template format would cause a validation error during stack creation, not a timeout after 20 minutes. Option C is incorrect because an unavailable instance type would cause an API error (e.g., 'InvalidInstanceType') immediately, not a timeout. Option D is incorrect because insufficient IAM permissions would cause an authorization error (e.g., 'API: ec2:RunInstances Access Denied') at the start of creation, not a delayed cancellation.

Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.

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 CloudFormation template uses an unsupported template format
Why it's wrong here
Incorrect. CloudFormation supports both JSON and YAML template formats. An unsupported format would cause a validation error during stack creation, not a timeout after 20 minutes.
✓
The EC2 instance creation exceeded the CloudFormation timeout
Why this is correct
Correct. CloudFormation has a default timeout of 20 minutes for EC2 instance creation. If the instance creation exceeds this timeout, CloudFormation cancels the resource creation, giving the 'Resource creation cancelled' error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
The instance type specified is not available in the chosen Availability Zone
Why it's wrong here
Incorrect. If the instance type is not available in the chosen Availability Zone, CloudFormation would receive an immediate API error (e.g., 'InvalidInstanceType' or 'InsufficientInstanceCapacity'), not a timeout after 20 minutes.
✗
Insufficient IAM permissions for CloudFormation to create EC2 instances
Why it's wrong here
Incorrect. Insufficient IAM permissions would cause an authorization error (e.g., 'Access Denied' when trying to create the EC2 instance) at the start of the creation process, not a cancellation after 20 minutes.

Common exam traps

Common exam trap: authentication is not authorization

Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.

Detailed technical explanation

How to think about this question

This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.

KKey Concepts to Remember

Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.

TExam Day Tips

Do not assume successful login means full administrative access.
Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
Separate login problems from permission problems before choosing the answer.

Key takeaway

Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.

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.

Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SOA-C02 questions on access control and AAA configuration.

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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 — Authentication checks who the user is..

What is the correct answer to this question?

The correct answer is: The EC2 instance creation exceeded the CloudFormation timeout — Option B is correct because CloudFormation has a default timeout of 20 minutes for EC2 instance creation. If the instance creation takes longer than the timeout, CloudFormation cancels the resource creation, resulting in the 'Resource creation cancelled' error. Option A is incorrect because an unsupported template format would cause a validation error during stack creation, not a timeout after 20 minutes. Option C is incorrect because an unavailable instance type would cause an API error (e.g., 'InvalidInstanceType') immediately, not a timeout. Option D is incorrect because insufficient IAM permissions would cause an authorization error (e.g., 'API: ec2:RunInstances Access Denied') at the start of creation, not a delayed cancellation.

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?

Authentication checks who the user is.

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