- A
The VPC has a route that points to the transit gateway for the on-premises CIDR, causing asymmetric routing.
Why wrong: Asymmetric routing can cause issues, but the scenario describes traffic being dropped, not asymmetric routing.
- B
The Direct Connect VIF is not configured with BFD.
Why wrong: BFD is for fast failure detection, not for routing traffic; lack of BFD would not cause drops.
- C
The transit gateway route table does not have a route for the on-premises CIDR (172.16.0.0/12) pointing to the Direct Connect attachment.
The transit gateway needs a route for the on-premises CIDR to forward return traffic to the Direct Connect attachment.
- D
The VPC route table does not have a route for the on-premises CIDR pointing to the transit gateway.
Why wrong: The VPC route table is for traffic leaving the VPC; the issue is with the transit gateway routing return traffic.
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 is using an AWS Transit Gateway to connect multiple VPCs and on-premises networks via Direct Connect. The network team notices that traffic from an on-premises network (CIDR 172.16.0.0/12) to a VPC (CIDR 10.0.0.0/16) is being dropped. The transit gateway route table shows a static route for 10.0.0.0/16 pointing to the VPC attachment. The Direct Connect virtual interface (VIF) is associated with the transit gateway and the on-premises router is advertising 172.16.0.0/12 via BGP. What is the most likely cause of the traffic being dropped?
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 transit gateway route table does not have a route for the on-premises CIDR (172.16.0.0/12) pointing to the Direct Connect attachment.
The transit gateway route table must contain a route for the on-premises CIDR (172.16.0.0/12) pointing to the Direct Connect attachment for return traffic to be forwarded correctly. Without this route, the transit gateway has no path for traffic destined to the on-premises network, causing it to be dropped. The static route for 10.0.0.0/16 only handles traffic toward the VPC, not the return direction.
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.
- ✗
The VPC has a route that points to the transit gateway for the on-premises CIDR, causing asymmetric routing.
Why it's wrong here
Asymmetric routing can cause issues, but the scenario describes traffic being dropped, not asymmetric routing.
- ✗
The Direct Connect VIF is not configured with BFD.
Why it's wrong here
BFD is for fast failure detection, not for routing traffic; lack of BFD would not cause drops.
- ✓
The transit gateway route table does not have a route for the on-premises CIDR (172.16.0.0/12) pointing to the Direct Connect attachment.
- ✗
The VPC route table does not have a route for the on-premises CIDR pointing to the transit gateway.
Why it's wrong here
The VPC route table is for traffic leaving the VPC; the issue is with the transit gateway routing return traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the transit gateway automatically learns routes from BGP advertisements over Direct Connect and installs them into the route table, but in reality, you must either propagate the attachment or add a static route for the on-premises CIDR.
Trap categories for this question
Scenario analysis trap
Asymmetric routing can cause issues, but the scenario describes traffic being dropped, not asymmetric routing.
Detailed technical explanation
How to think about this question
Transit gateway route tables operate independently from VPC route tables; they control how traffic is forwarded between attachments. When an on-premises network advertises a prefix via BGP over Direct Connect, the transit gateway does not automatically install a route for that prefix into its route table unless a static route or a route propagation is configured. In this scenario, the on-premises CIDR must be explicitly added as a static route pointing to the Direct Connect attachment, or the attachment must be associated with a route table that has propagation enabled for the Direct Connect virtual interface.
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.
What to study next
Got this wrong? Here's your next step.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The transit gateway route table does not have a route for the on-premises CIDR (172.16.0.0/12) pointing to the Direct Connect attachment. — The transit gateway route table must contain a route for the on-premises CIDR (172.16.0.0/12) pointing to the Direct Connect attachment for return traffic to be forwarded correctly. Without this route, the transit gateway has no path for traffic destined to the on-premises network, causing it to be dropped. The static route for 10.0.0.0/16 only handles traffic toward the VPC, not the return direction.
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.
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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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