- A
Deploy AWS Network Firewall in each VPC.
Why wrong: Overly complex and costly for simple isolation.
- B
Create separate Transit Gateway route tables and associate VPC attachments to the appropriate route tables.
Transit Gateway route tables provide scalable isolation.
- C
Use Security Groups in each VPC to filter traffic.
Why wrong: Security Groups cannot control traffic across VPCs.
- D
Use VPC Peering connections and modify route tables.
Why wrong: VPC Peering is not transitive and requires many connections.
Question 1,606 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 multiple VPCs connected via a Transit Gateway. Each VPC has its own CIDR block. The company wants to isolate network traffic between specific VPCs. What is the most scalable way to achieve this?
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 separate Transit Gateway route tables and associate VPC attachments to the appropriate route tables.
Transit Gateway route tables allow you to isolate traffic between VPCs by controlling which VPC attachments can communicate with each other. By associating each VPC attachment with a specific route table and configuring route propagation appropriately, you can enforce isolation without additional appliances or complex routing. This approach scales seamlessly as you add more VPCs, because you simply create new route tables and associate attachments as needed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy AWS Network Firewall in each VPC.
Why it's wrong here
Overly complex and costly for simple isolation.
- ✓
Create separate Transit Gateway route tables and associate VPC attachments to the appropriate route tables.
Why this is correct
Transit Gateway route tables provide scalable isolation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Security Groups in each VPC to filter traffic.
Why it's wrong here
Security Groups cannot control traffic across VPCs.
- ✗
Use VPC Peering connections and modify route tables.
Why it's wrong here
VPC Peering is not transitive and requires many connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Security Groups or Network Firewall are the only ways to isolate traffic, but the question specifically asks for the most scalable method, which is achieved by Transit Gateway route tables rather than per-VPC firewall appliances or instance-level security groups.
Detailed technical explanation
How to think about this question
Transit Gateway uses route tables to control the flow of traffic between attachments; each route table can have multiple associations, and attachments can be associated with only one route table at a time. By default, a Transit Gateway has a single route table that allows all attachments to communicate, but creating separate route tables and associating VPC attachments to them effectively creates isolated routing domains. This design is similar to using separate VRFs in a physical router, and it supports transitive routing only within the same route table, ensuring that VPCs in different route tables cannot exchange traffic even if they share a common CIDR.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create separate Transit Gateway route tables and associate VPC attachments to the appropriate route tables. — Transit Gateway route tables allow you to isolate traffic between VPCs by controlling which VPC attachments can communicate with each other. By associating each VPC attachment with a specific route table and configuring route propagation appropriately, you can enforce isolation without additional appliances or complex routing. This approach scales seamlessly as you add more VPCs, because you simply create new route tables and associate attachments as needed.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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