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Identity and Access Management →mediumMultiple ChoiceObjective-mapped

SCS-C02 Identity and Access Management Practice Question

This SCS-C02 practice question tests your understanding of identity and access management. 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 runs a multi-tier web application on AWS. The application consists of an Application Load Balancer (ALB) that distributes traffic to a fleet of EC2 instances in an Auto Scaling group. The EC2 instances need to read from an Amazon RDS MySQL database and write logs to an S3 bucket. The security team wants to ensure that the EC2 instances have only the minimum required permissions. Currently, the EC2 instances are launched with an IAM role that has an attached policy allowing full S3 access (s3:*) and full RDS access (rds:*). The security team has identified that this is overly permissive and wants to restrict access to only the specific resources needed. Additionally, the team wants to ensure that the EC2 instances can only access the RDS database using SSL/TLS. Which combination of actions should the security team take?

Clue words in this question

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

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Remove the IAM role from the EC2 instances and instead use resource-based policies on the S3 bucket and RDS instance to grant access to the EC2 instances' VPC or subnet.
Why wrong: Resource-based policies for RDS do not support granting access to EC2 instances by VPC; also, S3 bucket policies can be used but are not a replacement for IAM roles in this scenario.
B
Create an IAM user with the required permissions, generate access keys, and store them in a secure S3 bucket. Have the EC2 instances retrieve the credentials at startup using an instance profile.
Why wrong: Storing long-term credentials on EC2 is insecure and not recommended; using an instance profile is the correct approach.
C
Update the IAM role to have two policies: one that allows s3:PutObject on the specific S3 bucket with a prefix, and another that allows rds:Connect on the specific RDS instance ARN with a condition requiring rds:ForceSsl. Also, ensure the RDS instance requires SSL.
This follows the principle of least privilege by scoping permissions to specific resources and enforcing SSL.
D
Create a single IAM policy that allows s3:PutObject on the specific bucket and rds:Connect on the specific RDS instance without any conditions. Attach it to the IAM role.
Why wrong: Missing the SSL enforcement, which is a security requirement.

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

✓

Update the IAM role to have two policies: one that allows s3:PutObject on the specific S3 bucket with a prefix, and another that allows rds:Connect on the specific RDS instance ARN with a condition requiring rds:ForceSsl. Also, ensure the RDS instance requires SSL.

Option C is correct. By updating the IAM role with two separate policies, one for S3 and one for RDS, the permissions are scoped to the specific resources. The S3 policy allows s3:PutObject on the specific bucket and prefix, which is minimal for writing logs. The RDS policy allows rds:Connect on the specific RDS instance ARN and includes a condition requiring rds:ForceSsl to enforce SSL/TLS. Additionally, ensuring the RDS instance requires SSL matches the security team's requirement. Option A is incorrect because resource-based policies on S3 and RDS cannot grant access to EC2 instances directly without an IAM role; also, S3 bucket policies are not the appropriate method for EC2 instance access. Option B is incorrect because storing access keys in S3 is insecure and not a best practice; IAM roles with temporary credentials should be used. Option D is incorrect because it lacks the SSL enforcement condition and uses a single policy which might not be as clear but more importantly misses the SSL requirement.

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.

✗
Remove the IAM role from the EC2 instances and instead use resource-based policies on the S3 bucket and RDS instance to grant access to the EC2 instances' VPC or subnet.
Why it's wrong here
Resource-based policies for RDS do not support granting access to EC2 instances by VPC; also, S3 bucket policies can be used but are not a replacement for IAM roles in this scenario.
✗
Create an IAM user with the required permissions, generate access keys, and store them in a secure S3 bucket. Have the EC2 instances retrieve the credentials at startup using an instance profile.
Why it's wrong here
Storing long-term credentials on EC2 is insecure and not recommended; using an instance profile is the correct approach.
✓
Update the IAM role to have two policies: one that allows s3:PutObject on the specific S3 bucket with a prefix, and another that allows rds:Connect on the specific RDS instance ARN with a condition requiring rds:ForceSsl. Also, ensure the RDS instance requires SSL.
Why this is correct
This follows the principle of least privilege by scoping permissions to specific resources and enforcing SSL.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
Create a single IAM policy that allows s3:PutObject on the specific bucket and rds:Connect on the specific RDS instance without any conditions. Attach it to the IAM role.
Why it's wrong here
Missing the SSL enforcement, which is a security requirement.

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.

Trap categories for this question

Scenario analysis trap
Resource-based policies for RDS do not support granting access to EC2 instances by VPC; also, S3 bucket policies can be used but are not a replacement for IAM roles in this scenario.

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.

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 SCS-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SCS-C02 question test?

Identity and Access Management — This question tests Identity and Access Management — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Update the IAM role to have two policies: one that allows s3:PutObject on the specific S3 bucket with a prefix, and another that allows rds:Connect on the specific RDS instance ARN with a condition requiring rds:ForceSsl. Also, ensure the RDS instance requires SSL. — Option C is correct. By updating the IAM role with two separate policies, one for S3 and one for RDS, the permissions are scoped to the specific resources. The S3 policy allows s3:PutObject on the specific bucket and prefix, which is minimal for writing logs. The RDS policy allows rds:Connect on the specific RDS instance ARN and includes a condition requiring rds:ForceSsl to enforce SSL/TLS. Additionally, ensuring the RDS instance requires SSL matches the security team's requirement. Option A is incorrect because resource-based policies on S3 and RDS cannot grant access to EC2 instances directly without an IAM role; also, S3 bucket policies are not the appropriate method for EC2 instance access. Option B is incorrect because storing access keys in S3 is insecure and not a best practice; IAM roles with temporary credentials should be used. Option D is incorrect because it lacks the SSL enforcement condition and uses a single policy which might not be as clear but more importantly misses the SSL requirement.

What should I do if I get this SCS-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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