- A
Create separate Transit Gateway route tables for each VPC to isolate traffic.
Why wrong: Separate route tables would isolate, not enable full mesh.
- B
Create a VPN attachment to each VPC for encrypted communication.
Why wrong: VPN attachments are for on-premises, not needed for VPC-to-VPC over Transit Gateway.
- C
Associate each VPC attachment with the Transit Gateway route table.
Association allows the VPC to use the route table.
- D
Create a Transit Gateway and attach each VPC to it.
Attachments allow VPCs to connect to the Transit Gateway.
- E
Create a Transit Gateway route table and add static routes for each VPC CIDR pointing to the respective attachment.
Routes enable traffic between VPCs.
Question 1,679 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 a VPC with an IPv4 CIDR of 10.0.0.0/16. It needs to connect to two other VPCs: VPC B (10.1.0.0/16) and VPC C (10.2.0.0/16). The company wants to use AWS Transit Gateway. Which THREE configurations are required to enable full mesh connectivity between all three VPCs?
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
✓
Associate each VPC attachment with the Transit Gateway route table.
Option C is correct because associating each VPC attachment with the Transit Gateway route table is necessary for the Transit Gateway to know which attachments can communicate. Without this association, the Transit Gateway would not forward traffic between the VPCs, even if routes are present in the route table.
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.
- ✗
Create separate Transit Gateway route tables for each VPC to isolate traffic.
Why it's wrong here
Separate route tables would isolate, not enable full mesh.
- ✗
Create a VPN attachment to each VPC for encrypted communication.
- ✓
Associate each VPC attachment with the Transit Gateway route table.
Why this is correct
Association allows the VPC to use the route table.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create a Transit Gateway and attach each VPC to it.
Why this is correct
Attachments allow VPCs to connect to the Transit Gateway.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create a Transit Gateway route table and add static routes for each VPC CIDR pointing to the respective attachment.
Why this is correct
Routes enable traffic between VPCs.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think separate route tables are needed for isolation (Option A) or that VPN attachments are required for security (Option B), but full mesh connectivity simply requires a single Transit Gateway route table with routes pointing to each VPC attachment and all attachments associated with that route table.
Detailed technical explanation
How to think about this question
AWS Transit Gateway uses a centralized hub-and-spoke model where a single route table can propagate routes from multiple VPC attachments, enabling transitive routing. Under the hood, the Transit Gateway performs IP forwarding based on the most specific route in the associated route table, and static routes or propagated routes from attachments determine the path. In real-world scenarios, using a single route table simplifies management but requires careful route summarization to avoid overlapping CIDRs, which can cause asymmetric routing or black holes.
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: Associate each VPC attachment with the Transit Gateway route table. — Option C is correct because associating each VPC attachment with the Transit Gateway route table is necessary for the Transit Gateway to know which attachments can communicate. Without this association, the Transit Gateway would not forward traffic between the VPCs, even if routes are present in the route table.
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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