- A
Verify that the transit gateway route table contains the CIDR blocks of both VPCs.
The transit gateway route table must have routes for both VPC CIDRs to forward traffic between them.
- B
Check the route tables in VPC A and VPC B to ensure they have routes pointing to the transit gateway for the other VPC's CIDR.
Each VPC must have a route to the other VPC's CIDR pointing to the transit gateway attachment.
- C
Check the association of the VPC attachments with the transit gateway route table.
Each VPC attachment must be associated with the correct route table to use its routes.
- D
Check the Direct Connect virtual interface status.
Why wrong: Direct Connect is for on-premises connectivity, not VPC-to-VPC communication.
- E
Verify that the NAT Gateway in each VPC is properly configured.
Why wrong: NAT Gateways are for outbound internet traffic, not VPC-to-VPC routing.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 AWS Transit Gateway to connect multiple VPCs and on-premises networks. The network team observes that traffic between two VPCs (VPC A and VPC B) is not being forwarded correctly. The transit gateway route table is configured with static routes for the VPC CIDRs. Which THREE steps should the engineer take to troubleshoot this issue? (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
Verify that the transit gateway route table contains the CIDR blocks of both VPCs.
Option A is correct because the transit gateway route table must contain the CIDR blocks of both VPCs for traffic to be forwarded between them. Without these static routes, the transit gateway has no destination to route the traffic, causing it to be dropped. Verifying the route table entries ensures the necessary paths exist.
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.
- ✓
Verify that the transit gateway route table contains the CIDR blocks of both VPCs.
Why this is correct
The transit gateway route table must have routes for both VPC CIDRs to forward traffic between them.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Check the route tables in VPC A and VPC B to ensure they have routes pointing to the transit gateway for the other VPC's CIDR.
- ✓
Check the association of the VPC attachments with the transit gateway route table.
Why this is correct
Each VPC attachment must be associated with the correct route table to use its routes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Check the Direct Connect virtual interface status.
Why it's wrong here
Direct Connect is for on-premises connectivity, not VPC-to-VPC communication.
- ✗
Verify that the NAT Gateway in each VPC is properly configured.
Why it's wrong here
NAT Gateways are for outbound internet traffic, not VPC-to-VPC routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that NAT Gateway or Direct Connect configurations are involved in VPC-to-VPC routing, when in fact Transit Gateway relies solely on route tables and attachment associations for inter-VPC traffic.
Detailed technical explanation
How to think about this question
Transit Gateway uses route tables to determine how to forward traffic between attachments. Static routes must be explicitly added for VPC CIDRs, and the route table must be associated with the VPC attachments. Additionally, VPC route tables need a route pointing to the Transit Gateway attachment (e.g., via a transit gateway ID) for the destination VPC CIDR, ensuring symmetric routing. Without these, traffic fails even if the Transit Gateway route table is correct.
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: Verify that the transit gateway route table contains the CIDR blocks of both VPCs. — Option A is correct because the transit gateway route table must contain the CIDR blocks of both VPCs for traffic to be forwarded between them. Without these static routes, the transit gateway has no destination to route the traffic, causing it to be dropped. Verifying the route table entries ensures the necessary paths exist.
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: Jun 30, 2026
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