Quick Answer
The answer is Transit Gateway route tables with separate associations and propagations. This feature enables Transit Gateway route table isolation by allowing you to create distinct routing domains, so traffic between VPCs stays within the AWS backbone and never traverses the on-premises network. By associating VPC attachments with one route table and VPN or Direct Connect attachments with another, you control exactly which paths are available, effectively blocking inter-VPC traffic from leaking to your on-premises environment. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of how to segment hybrid network traffic using Transit Gateway, often appearing in scenario-based questions where you must prevent hair-pinning through a corporate data center. A common trap is confusing route propagation with route association—remember that propagation populates routes, while association binds an attachment to a specific route table. Memory tip: think of route tables as separate “rooms” for VPCs and VPNs; if they don’t share a door (route table), traffic cannot cross.
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 using AWS Transit Gateway to connect multiple VPCs and on-premises networks via Direct Connect and Site-to-Site VPN. The network team wants to ensure that traffic between VPCs does not traverse the on-premises network. Which Transit Gateway feature should be used?
Transit Gateway Multicast
Why wrong: Multicast is for group communication, not traffic isolation.
Transit Gateway Network Manager
Why wrong: Network Manager is for monitoring, not routing control.
Transit Gateway BGP over AWS Direct Connect
Why wrong: BGP is for exchanging routes, not isolating traffic.
Transit Gateway route tables with separate associations and propagations
This allows creating isolated routing domains.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transit Gateway route tables with separate associations and propagations
Option B is correct because Transit Gateway route tables allow isolation of traffic between different attachments (e.g., VPCs vs. VPN). Option A is wrong because multicast is not relevant. Option C is wrong because flow logs monitor traffic, not control routing. Option D is wrong because BGP is used for dynamic routing, not for isolation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Transit Gateway Multicast
Why it's wrong here
Multicast is for group communication, not traffic isolation.
Transit Gateway Network Manager
Why it's wrong here
Network Manager is for monitoring, not routing control.
Transit Gateway BGP over AWS Direct Connect
Why it's wrong here
BGP is for exchanging routes, not isolating traffic.
Transit Gateway route tables with separate associations and propagations
Why this is correct
This allows creating isolated routing domains.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Implementation — study guide chapter
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FAQ
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
The correct answer is: Transit Gateway route tables with separate associations and propagations — Option B is correct because Transit Gateway route tables allow isolation of traffic between different attachments (e.g., VPCs vs. VPN). Option A is wrong because multicast is not relevant. Option C is wrong because flow logs monitor traffic, not control routing. Option D is wrong because BGP is used for dynamic routing, not for isolation.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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 →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using AWS Transit Gateway to connect multiple VPCs and an on-premises network via Direct Connect. The network team wants to isolate traffic between VPCs while allowing all VPCs to reach the on-premises network. Which TWO configurations should be implemented?
mediumWhy A: Options B and C are correct because Transit Gateway route tables can be used to isolate traffic, and VPN attachments can be used for segmentation. Option A is wrong because VPC peering is not needed if Transit Gateway is used. Option D is wrong because a single route table would allow all VPCs to communicate. Option E is wrong because Direct Connect gateway does not isolate traffic between VPCs.
Variation 2. A company has multiple VPCs connected via AWS Transit Gateway. Each VPC has its own route table in the transit gateway. The company wants to restrict traffic between certain VPCs. For example, VPC A should be able to send traffic to VPC B but not to VPC C. VPC B should be able to send traffic to VPC C. Which configuration should the company use?
hardWhy C: Option C is correct because each VPC has its own route table, and you can add routes for specific VPC attachments. By not adding a route for VPC C in VPC A's route table, traffic is blocked. Option A is wrong because a single shared route table would allow all VPCs to communicate. Option B is wrong because network ACLs are not applied at transit gateway attachments. Option D is wrong because security groups are not used for inter-VPC routing decisions.
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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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