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Network Security, Compliance and Governance →mediumMultiple ChoiceObjective-mapped

ANS-C01 Network Security, Compliance and Governance Practice Question

This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 has deployed a web application on an EC2 instance that needs to access an S3 bucket and a DynamoDB table. The instance is in a private subnet. Which approach meets the security best practice of avoiding long-lived credentials on the instance?

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.

A
Store IAM user access keys in the application configuration file.
Why wrong: IAM user credentials are long-lived and should not be stored on EC2 instances.
B
Configure security group rules to allow outbound traffic to S3 and DynamoDB endpoints.
Why wrong: Security groups control network traffic but do not grant access to S3 or DynamoDB API operations.
C
Use AWS Systems Manager Parameter Store to store credentials and retrieve them at runtime using the instance's IAM role.
Why wrong: This still requires the instance to have an IAM role to access Parameter Store, but then the credentials from Parameter Store are still long-lived.
D
Create an IAM role with policies granting access to S3 and DynamoDB, and attach the role to the EC2 instance profile.
The instance can obtain temporary credentials from the instance metadata service, eliminating the need for long-lived credentials.

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

✓

Create an IAM role with policies granting access to S3 and DynamoDB, and attach the role to the EC2 instance profile.

The best practice is to attach an IAM role with the necessary permissions to the EC2 instance. The instance automatically obtains temporary credentials via the instance metadata service, avoiding long-lived credentials. Option D is correct. Option A (IAM user access keys) is not recommended as they are long-lived. Option B (security group rules) controls network traffic but does not grant access to S3 or DynamoDB. Option C (AWS Systems Manager Parameter Store) still requires credentials to access the parameters, which would not eliminate long-lived credentials.

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.

✗
Store IAM user access keys in the application configuration file.
Why it's wrong here
IAM user credentials are long-lived and should not be stored on EC2 instances.
✗
Configure security group rules to allow outbound traffic to S3 and DynamoDB endpoints.
Why it's wrong here
Security groups control network traffic but do not grant access to S3 or DynamoDB API operations.
✗
Use AWS Systems Manager Parameter Store to store credentials and retrieve them at runtime using the instance's IAM role.
Why it's wrong here
This still requires the instance to have an IAM role to access Parameter Store, but then the credentials from Parameter Store are still long-lived.
✓
Create an IAM role with policies granting access to S3 and DynamoDB, and attach the role to the EC2 instance profile.
Why this is correct
The instance can obtain temporary credentials from the instance metadata service, eliminating the need for long-lived credentials.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.

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 ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Create an IAM role with policies granting access to S3 and DynamoDB, and attach the role to the EC2 instance profile. — The best practice is to attach an IAM role with the necessary permissions to the EC2 instance. The instance automatically obtains temporary credentials via the instance metadata service, avoiding long-lived credentials. Option D is correct. Option A (IAM user access keys) is not recommended as they are long-lived. Option B (security group rules) controls network traffic but does not grant access to S3 or DynamoDB. Option C (AWS Systems Manager Parameter Store) still requires credentials to access the parameters, which would not eliminate long-lived credentials.

What should I do if I get this ANS-C01 question wrong?

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?

CIDR notation defines the prefix length.

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