The correct answer includes that you can attach a Direct Connect Gateway to a Transit Gateway for hybrid connectivity, as this enables centralized on-premises access across multiple VPCs. This works because Transit Gateway acts as a hub, and a Direct Connect Gateway attachment allows a single Direct Connect connection to route traffic to any attached VPC, simplifying hybrid network design. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of transitive routing and centralized egress patterns, often appearing in scenario-based questions where you must choose valid design considerations. A common trap is assuming each VPC must have a unique CIDR for Transit Gateway to function—while unique CIDRs are best practice to avoid conflicts, Transit Gateway itself does not enforce uniqueness. Another trap is forgetting that Transit Gateway supports multicast, which is a valid feature. For memory, remember “DCN” for Direct Connect, Centralized internet, and Network segmentation—the three key valid considerations in multi-VPC design.
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 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.
Options A, D, and E are correct. A: Transit Gateway supports transitive routing, but route tables control which VPCs can communicate. B is wrong because each VPC needs a unique CIDR to avoid routing conflicts. C is wrong because Transit Gateway supports multicast. D is correct: you can attach Direct Connect Gateway to Transit Gateway for on-premises connectivity. E is correct: you can centralize internet access via a NAT gateway in a shared VPC.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
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. — Options A, D, and E are correct. A: Transit Gateway supports transitive routing, but route tables control which VPCs can communicate. B is wrong because each VPC needs a unique CIDR to avoid routing conflicts. C is wrong because Transit Gateway supports multicast. D is correct: you can attach Direct Connect Gateway to Transit Gateway for on-premises connectivity. E is correct: you can centralize internet access via a NAT gateway in a shared VPC.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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 →
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. Which THREE of the following are features of AWS Transit Gateway? (Select THREE.)
medium
✓ A.Multicast support
B.Built-in NAT capabilities
✓ C.Transitive routing between multiple VPCs
✓ D.Centralized routing and management
E.Edge-to-edge routing for VPN connections
Why A: Options A, B, and D are correct. Transit Gateway supports transitive peering, multicast, and central routing. Option C is incorrect because Transit Gateway does not support edge-to-edge routing for VPN. Option E is incorrect because Transit Gateway does not replace NAT Gateway; NAT Gateway is separate.
Last reviewed: Jun 20, 2026
Question Discussion
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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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