- A
Verify that the VPC route tables have routes pointing to the Transit Gateway attachment.
Missing routes would prevent traffic from reaching the Transit Gateway.
- B
Check the security groups of the Transit Gateway.
Why wrong: Transit Gateways do not have security groups.
- C
Ping the Transit Gateway to verify its status.
Why wrong: Transit Gateways do not respond to ICMP ping.
- D
Examine the network ACLs for the Transit Gateway.
Why wrong: Network ACLs are associated with subnets, not the Transit Gateway itself.
- E
Review VPC Flow Logs for the subnets to see if traffic is being blocked.
Flow Logs can indicate if traffic is being dropped by security groups or NACLs.
Question 140 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 network engineer is troubleshooting connectivity issues between two VPCs connected via a Transit Gateway. The VPCs are in the same region and have proper route tables. Which TWO actions should the engineer perform to diagnose the problem?
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 VPC route tables have routes pointing to the Transit Gateway attachment.
Option A is correct because for traffic to flow from a VPC to a Transit Gateway, the VPC's route tables must include a route pointing to the Transit Gateway attachment (e.g., 10.0.0.0/16 -> tgw-xxx). Without this route, the VPC has no path to send traffic into the Transit Gateway, causing connectivity failure regardless of other configurations.
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 VPC route tables have routes pointing to the Transit Gateway attachment.
Why this is correct
Missing routes would prevent traffic from reaching the Transit Gateway.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Check the security groups of the Transit Gateway.
Why it's wrong here
Transit Gateways do not have security groups.
- ✗
Ping the Transit Gateway to verify its status.
Why it's wrong here
Transit Gateways do not respond to ICMP ping.
- ✗
Examine the network ACLs for the Transit Gateway.
Why it's wrong here
Network ACLs are associated with subnets, not the Transit Gateway itself.
- ✓
Review VPC Flow Logs for the subnets to see if traffic is being blocked.
Why this is correct
Flow Logs can indicate if traffic is being dropped by security groups or NACLs.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that Transit Gateway has its own security groups or NACLs, leading candidates to incorrectly select options B or D, when in fact these constructs only exist at the VPC/subnet level.
Detailed technical explanation
How to think about this question
Transit Gateway acts as a hub for VPC-to-VPC routing using a centralized route table. Each VPC attachment must have a route in the VPC's route table pointing to the Transit Gateway attachment ID, and the Transit Gateway route table must have a route pointing to the destination VPC's CIDR via the appropriate attachment. VPC Flow Logs capture traffic metadata at the ENI level, allowing engineers to identify dropped packets due to security groups or NACLs, which is why option E is also 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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify that the VPC route tables have routes pointing to the Transit Gateway attachment. — Option A is correct because for traffic to flow from a VPC to a Transit Gateway, the VPC's route tables must include a route pointing to the Transit Gateway attachment (e.g., 10.0.0.0/16 -> tgw-xxx). Without this route, the VPC has no path to send traffic into the Transit Gateway, causing connectivity failure regardless of other configurations.
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: Jul 4, 2026
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