- A
The Transit Gateway route table is not associated with the VPC attachments.
Why wrong: Route tables are associated with attachments, but missing association would cause no connectivity, not suboptimal routing.
- B
The VPC subnet route tables are not pointing to the Transit Gateway as the target.
Why wrong: Subnet routing is separate; traffic still reaches Transit Gateway, but the issue is within Transit Gateway routing.
- C
The on-premises network is advertising more specific routes via BGP that override the Transit Gateway routes.
BGP routes from on-premises can be more specific and take precedence, causing traffic to be sent on-premises.
- D
VPC peering connections are being used alongside Transit Gateway, creating conflicting routes.
Why wrong: VPC peering is separate and would not cause Transit Gateway to route traffic on-premises.
ANS-C01 Network Management and Operations Practice Question
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 data centers. The network team notices that traffic between two VPCs is taking an unexpected path through the on-premises network instead of staying within the Transit Gateway. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The on-premises network is advertising more specific routes via BGP that override the Transit Gateway routes.
Option B is correct because route propagation from the on-premises network via the VPN or Direct Connect can introduce more specific routes that override the local Transit Gateway routes. Option A is wrong because route tables are attached to the Transit Gateway, not specific VPC attachments. Option C is wrong because VPC peering is not used with Transit Gateway. Option D is wrong because subnet associations do not affect Transit Gateway routing.
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.
- ✗
The Transit Gateway route table is not associated with the VPC attachments.
Why it's wrong here
Route tables are associated with attachments, but missing association would cause no connectivity, not suboptimal routing.
- ✗
The VPC subnet route tables are not pointing to the Transit Gateway as the target.
Why it's wrong here
Subnet routing is separate; traffic still reaches Transit Gateway, but the issue is within Transit Gateway routing.
- ✓
The on-premises network is advertising more specific routes via BGP that override the Transit Gateway routes.
- ✗
VPC peering connections are being used alongside Transit Gateway, creating conflicting routes.
Why it's wrong here
VPC peering is separate and would not cause Transit Gateway to route traffic on-premises.
Common exam traps
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.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The on-premises network is advertising more specific routes via BGP that override the Transit Gateway routes. — Option B is correct because route propagation from the on-premises network via the VPN or Direct Connect can introduce more specific routes that override the local Transit Gateway routes. Option A is wrong because route tables are attached to the Transit Gateway, not specific VPC attachments. Option C is wrong because VPC peering is not used with Transit Gateway. Option D is wrong because subnet associations do not affect Transit Gateway routing.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
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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