This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create separate transit gateway route tables for each VPC and add only the desired routes for other VPCs.
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.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 network ACLs on the transit gateway attachments to filter traffic.
Why it's wrong here
Transit gateway does not support network ACLs on attachments.
✗
Use security groups on the VPC attachments to allow or deny traffic.
Why it's wrong here
Security groups are per-ENI, not at transit gateway level.
✓
Create separate transit gateway route tables for each VPC and add only the desired routes for other VPCs.
Why this is correct
Enables selective communication.
Related concept
Standard ACLs match source addresses.
✗
Create a single transit gateway route table and associate all VPC attachments with it.
Why it's wrong here
Would allow all-to-all communication.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
Network Implementation — This question tests Network Implementation — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create separate transit gateway route tables for each VPC and add only the desired routes for other VPCs. — 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.
What should I do if I get this ANS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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 →
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.
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.
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.
Sign in to join the discussion.