- A
Use Transit Gateway Network Manager to create a network segmentation design.
Network Manager helps visualize and manage segmentation.
- B
Create separate Transit Gateway route tables for different groups of VPCs and associate the VPC attachments accordingly.
Route tables in Transit Gateway control traffic flow between attachments.
- C
Configure network ACLs on the VPC subnets to allow or deny traffic.
Why wrong: NACLs are stateless and control traffic at the subnet level but are not designed for Transit Gateway segmentation.
- D
Use security groups on the Transit Gateway attachments.
Why wrong: Security groups are not supported on Transit Gateway attachments.
- E
Implement VPC endpoints for inter-VPC communication.
Why wrong: VPC endpoints are for accessing AWS services privately, not for VPC-to-VPC traffic.
Quick Answer
The answer is to create separate Transit Gateway route tables for different groups of VPCs and associate the VPC attachments accordingly, combined with using Transit Gateway Network Manager for segmentation. This works because Transit Gateway route tables define the path for traffic between attachments; by isolating VPCs into distinct route tables, you explicitly control which VPCs can exchange routes and thus communicate. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this tests your understanding of Transit Gateway’s core isolation mechanism, often appearing as a scenario where you must prevent lateral traffic between non-peer VPCs. A common trap is confusing VPC-level controls like NACLs or security groups with Transit Gateway’s routing layer—NACLs operate per subnet, not per VPC, and security groups are instance-level, making them unsuitable for inter-VPC traffic isolation. Memory tip: think of Transit Gateway route tables as “traffic clubs”—only VPCs in the same club can talk to each other.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 is deploying an application across multiple VPCs using AWS Transit Gateway. They need to ensure that only specific VPCs can communicate with each other. Which TWO methods can be used to isolate traffic?
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 Transit Gateway Network Manager to create a network segmentation design.
Option A is correct because separate route tables can control which VPCs can communicate. Option D is correct because Transit Gateway Network Manager can create segmentation. Option B is incorrect because NACLs are per subnet, not per VPC. Option C is incorrect because security groups are instance-level. Option E is incorrect because VPC endpoints are for accessing services, not inter-VPC traffic.
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 Transit Gateway Network Manager to create a network segmentation design.
Why this is correct
Network Manager helps visualize and manage segmentation.
Related concept
CIDR notation defines the prefix length.
- ✓
Create separate Transit Gateway route tables for different groups of VPCs and associate the VPC attachments accordingly.
- ✗
Configure network ACLs on the VPC subnets to allow or deny traffic.
Why it's wrong here
NACLs are stateless and control traffic at the subnet level but are not designed for Transit Gateway segmentation.
- ✗
Use security groups on the Transit Gateway attachments.
Why it's wrong here
Security groups are not supported on Transit Gateway attachments.
- ✗
Implement VPC endpoints for inter-VPC communication.
Why it's wrong here
VPC endpoints are for accessing AWS services privately, not for VPC-to-VPC traffic.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use Transit Gateway Network Manager to create a network segmentation design. — Option A is correct because separate route tables can control which VPCs can communicate. Option D is correct because Transit Gateway Network Manager can create segmentation. Option B is incorrect because NACLs are per subnet, not per VPC. Option C is incorrect because security groups are instance-level. Option E is incorrect because VPC endpoints are for accessing services, not inter-VPC traffic.
What should I do if I get this ANS-C01 question wrong?
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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.
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