← ANS-C01·Amazon Web Services

Question 50 of 1,705

Network Security, Compliance and Governance →mediumMultiple SelectObjective-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.

Which THREE of the following are valid ways to restrict access to an S3 bucket that is accessed by EC2 instances in a VPC?

A
Use an S3 bucket policy that restricts access to the VPC or VPC endpoint.
S3 bucket policies can use aws:SourceVpc or aws:SourceVpce conditions.
B
Use a network ACL to restrict access to the S3 prefix list.
Why wrong: NACLs can allow S3 prefix list IPs, but not restrict to a specific bucket.
C
Use a VPC endpoint policy to allow access only to the specific S3 bucket.
VPC endpoint policies can limit access to specific buckets.
D
Use an IAM role (instance profile) attached to the EC2 instance with permissions for the S3 bucket.
Instance profiles provide credentials that can be used to access S3.
E
Use a security group to allow outbound traffic from the EC2 instance to the S3 bucket.
Why wrong: Security groups do not filter by S3 bucket; they filter by IP.

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

✓

Use an S3 bucket policy that restricts access to the VPC or VPC endpoint.

Options A, C, and D are correct. Option A: S3 bucket policies can restrict access based on source VPC or VPC endpoint. Option C: VPC endpoint policies can specify which S3 buckets can be accessed through the endpoint. Option D: IAM roles (instance profiles) grant permissions to EC2 instances to access S3 buckets. Option B is incorrect because network ACLs operate at the subnet level and do not filter by S3 bucket; they only filter based on IP addresses. Option E is incorrect because security groups do not apply to S3 bucket access; they control traffic to/from EC2 instances.

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.

✓
Use an S3 bucket policy that restricts access to the VPC or VPC endpoint.
Why this is correct
S3 bucket policies can use aws:SourceVpc or aws:SourceVpce conditions.
Related concept
CIDR notation defines the prefix length.
✗
Use a network ACL to restrict access to the S3 prefix list.
Why it's wrong here
NACLs can allow S3 prefix list IPs, but not restrict to a specific bucket.
✓
Use a VPC endpoint policy to allow access only to the specific S3 bucket.
Why this is correct
VPC endpoint policies can limit access to specific buckets.
Related concept
CIDR notation defines the prefix length.
✓
Use an IAM role (instance profile) attached to the EC2 instance with permissions for the S3 bucket.
Why this is correct
Instance profiles provide credentials that can be used to access S3.
Related concept
CIDR notation defines the prefix length.
✗
Use a security group to allow outbound traffic from the EC2 instance to the S3 bucket.
Why it's wrong here
Security groups do not filter by S3 bucket; they filter by IP.

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.

Related ANS-C01 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Network Management and Operations practice questions

Practise ANS-C01 questions linked to Network Management and Operations.

Network Security, Compliance and Governance practice questions

Practise ANS-C01 questions linked to Network Security, Compliance and Governance.

Network Design practice questions

Practise ANS-C01 questions linked to Network Design.

Network Implementation practice questions

Practise ANS-C01 questions linked to Network Implementation.

ANS-C01 fundamentals practice questions

Practise ANS-C01 questions linked to ANS-C01 fundamentals.

ANS-C01 scenario practice questions

Practise ANS-C01 questions linked to ANS-C01 scenario.

ANS-C01 troubleshooting practice questions

Practise ANS-C01 questions linked to ANS-C01 troubleshooting.

Practice this exam

Start a free ANS-C01 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

ANS-C01 practice-test guide →Study guide →Browse all practice tests

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: Use an S3 bucket policy that restricts access to the VPC or VPC endpoint. — Options A, C, and D are correct. Option A: S3 bucket policies can restrict access based on source VPC or VPC endpoint. Option C: VPC endpoint policies can specify which S3 buckets can be accessed through the endpoint. Option D: IAM roles (instance profiles) grant permissions to EC2 instances to access S3 buckets. Option B is incorrect because network ACLs operate at the subnet level and do not filter by S3 bucket; they only filter based on IP addresses. Option E is incorrect because security groups do not apply to S3 bucket access; they control traffic to/from EC2 instances.

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

What is the key concept behind this question?

CIDR notation defines the prefix length.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.