- A
You can route internet-bound traffic from multiple VPCs through a single shared VPC with a NAT gateway.
Centralized NAT via Transit Gateway routing.
- B
Transit Gateway does not support multicast traffic.
Why wrong: Transit Gateway supports multicast (with appropriate configurations).
- C
You can use separate route tables to isolate traffic between different VPCs.
Route tables allow segmentation of traffic.
- D
VPCs attached to the same Transit Gateway can have overlapping CIDR blocks.
Why wrong: Overlapping CIDRs cause routing ambiguity.
- E
You can attach a Direct Connect Gateway to a Transit Gateway for hybrid connectivity.
Direct Connect Gateway can be associated with Transit Gateway.
Question 1,320 of 1,705
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.
Which THREE of the following are valid considerations when designing a multi-VPC architecture using AWS Transit Gateway? (Choose three.)
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
✓
You can route internet-bound traffic from multiple VPCs through a single shared VPC with a NAT gateway.
Option A is correct because AWS Transit Gateway allows you to centralize internet-bound traffic by routing it from multiple VPCs through a single shared VPC that contains a NAT gateway. This design reduces costs and simplifies management by avoiding the need for a separate NAT gateway in each VPC, as the Transit Gateway can propagate routes to direct traffic to the shared VPC's NAT gateway for egress to the internet.
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.
- ✓
You can route internet-bound traffic from multiple VPCs through a single shared VPC with a NAT gateway.
- ✗
Transit Gateway does not support multicast traffic.
Why it's wrong here
Transit Gateway supports multicast (with appropriate configurations).
- ✓
You can use separate route tables to isolate traffic between different VPCs.
Why this is correct
Route tables allow segmentation of traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VPCs attached to the same Transit Gateway can have overlapping CIDR blocks.
Why it's wrong here
Overlapping CIDRs cause routing ambiguity.
- ✓
You can attach a Direct Connect Gateway to a Transit Gateway for hybrid connectivity.
Why this is correct
Direct Connect Gateway can be associated with Transit Gateway.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that Transit Gateway does not support multicast at all, when in fact it does support it with specific configuration requirements, and the trap with overlapping CIDRs is that candidates assume route tables can resolve conflicts, but Transit Gateway requires unique CIDRs across all attached VPCs for proper routing.
Detailed technical explanation
How to think about this question
Transit Gateway uses a hub-and-spoke model with route tables that can be associated with attachments to control traffic flow. For multicast, you must create a multicast domain and associate subnets from attached VPCs, and the Transit Gateway acts as a multicast router forwarding UDP traffic. In real-world scenarios, overlapping CIDRs are avoided by using non-overlapping IP address ranges or by leveraging network segmentation with separate route tables and VPC peering alternatives.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: You can route internet-bound traffic from multiple VPCs through a single shared VPC with a NAT gateway. — Option A is correct because AWS Transit Gateway allows you to centralize internet-bound traffic by routing it from multiple VPCs through a single shared VPC that contains a NAT gateway. This design reduces costs and simplifies management by avoiding the need for a separate NAT gateway in each VPC, as the Transit Gateway can propagate routes to direct traffic to the shared VPC's NAT gateway for egress to the internet.
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
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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