The answer is to create an IAM role with the necessary permissions and attach it to the EC2 instance. This is the best practice because the instance assumes the role to obtain temporary credentials from the AWS Security Token Service (STS) via the instance metadata service, eliminating the need to hardcode or store long-term access keys. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of least privilege and credential lifecycle management—a common trap is choosing to embed access keys in code or use an IAM user, which violates security best practices and fails to provide truly temporary credentials. The key distinction is that an IAM role delivers automatically rotated, limited-privilege credentials, while static keys or user credentials introduce permanent risk. Memory tip: think "Role for Rotation"—if the credentials aren't automatically refreshed and temporary, it’s the wrong answer.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 wants to provide temporary, limited-privilege credentials to its application running on an EC2 instance so that the application can access an S3 bucket. What is the BEST practice for achieving this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an IAM role with the necessary permissions and attach it to the EC2 instance
Using an IAM role attached to the EC2 instance allows temporary credentials via instance metadata. Option A (access key in code) is insecure. Option B (IAM user credentials) is not temporary and less secure. Option D (S3 bucket policy) does not provide credentials to the instance.
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.
✗
Use an S3 bucket policy to allow access from the EC2 instance's public IP
Why it's wrong here
Bucket policies control access from IPs, but do not provide credentials; also, IPs can change.
✗
Create an IAM user and store the credentials in the EC2 instance user data
Why it's wrong here
IAM user credentials are long-term and should not be stored on instances; they are not temporary.
✗
Store AWS access keys in the application code
Why it's wrong here
Storing access keys in code is insecure and not a best practice; they can be exposed.
✓
Create an IAM role with the necessary permissions and attach it to the EC2 instance
Why this is correct
An IAM role provides temporary credentials that are automatically rotated, which is secure and best practice.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
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 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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SAP-C02 questions on access control and AAA configuration.
Design for New Solutions — This question tests Design for New Solutions — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Create an IAM role with the necessary permissions and attach it to the EC2 instance — Using an IAM role attached to the EC2 instance allows temporary credentials via instance metadata. Option A (access key in code) is insecure. Option B (IAM user credentials) is not temporary and less secure. Option D (S3 bucket policy) does not provide credentials to the instance.
What should I do if I get this SAP-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SAP-C02 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Authentication checks who the user is.
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