This DOP-C02 practice question tests your understanding of security and compliance. 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 developer needs to allow an EC2 instance to read from an S3 bucket. Which is the most secure way to grant this access?
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 an S3 read policy and attach it to the EC2 instance profile.
Option A is correct because an IAM role attached to the EC2 instance allows temporary credentials without hardcoding keys. Option B is wrong because storing keys in the instance is insecure. Option C is wrong because root credentials are highly privileged and should never be used. Option D is wrong because resource-based policies on S3 can grant access to IAM roles, but the role must still be attached 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 the root user credentials of the AWS account.
Why it's wrong here
Root credentials are powerful and should not be used for everyday tasks.
✗
Store AWS access keys in the instance's user data and use them in the application.
Why it's wrong here
Access keys are long-term credentials that can be compromised if stored insecurely.
✗
Create an S3 bucket policy that allows the EC2 instance's public IP address.
Why it's wrong here
IP-based policies are less secure and do not scale; also EC2 instances can have changing IPs.
✓
Create an IAM role with an S3 read policy and attach it to the EC2 instance profile.
Why this is correct
This is the best practice for granting permissions to AWS services.
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 DOP-C02 questions on access control and AAA configuration.
Security and Compliance — This question tests Security and Compliance — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Create an IAM role with an S3 read policy and attach it to the EC2 instance profile. — Option A is correct because an IAM role attached to the EC2 instance allows temporary credentials without hardcoding keys. Option B is wrong because storing keys in the instance is insecure. Option C is wrong because root credentials are highly privileged and should never be used. Option D is wrong because resource-based policies on S3 can grant access to IAM roles, but the role must still be attached to the instance.
What should I do if I get this DOP-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 DOP-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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