This ANS-C01 practice question tests your understanding of network management and operations. 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 uses AWS Transit Gateway to connect multiple VPCs and on-premises networks. They want to limit traffic between specific VPCs for security purposes. Which feature should they use?
Security groups attached to the Transit Gateway.
Why wrong: Security groups cannot be attached to Transit Gateway.
Transit Gateway route tables.
Route tables control which attachments can communicate.
VPC Flow Logs.
Why wrong: Flow Logs are for monitoring, not traffic control.
Network ACLs in each VPC.
Why wrong: NACLs are stateless and not designed for inter-VPC traffic control via Transit Gateway.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transit Gateway route tables.
Option C is correct because Transit Gateway route tables can be used to control traffic between attachments by creating separate route tables and associating attachments accordingly. Option A is wrong because Network ACLs are per-subnet, not per-VPC. Option B is wrong because security groups are instance-level. Option D is wrong because VPC Flow Logs are for monitoring, not control.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Security groups attached to the Transit Gateway.
Why it's wrong here
Security groups cannot be attached to Transit Gateway.
Transit Gateway route tables.
Why this is correct
Route tables control which attachments can communicate.
Related concept
CIDR notation defines the prefix length.
VPC Flow Logs.
Why it's wrong here
Flow Logs are for monitoring, not traffic control.
Network ACLs in each VPC.
Why it's wrong here
NACLs are stateless and not designed for inter-VPC traffic control via Transit Gateway.
Common exam traps
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
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.
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
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
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.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
The correct answer is: Transit Gateway route tables. — Option C is correct because Transit Gateway route tables can be used to control traffic between attachments by creating separate route tables and associating attachments accordingly. Option A is wrong because Network ACLs are per-subnet, not per-VPC. Option B is wrong because security groups are instance-level. Option D is wrong because VPC Flow Logs are for monitoring, not control.
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.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 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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