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Network Management and Operations →mediumMultiple ChoiceObjective-mapped

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 uses AWS Transit Gateway to connect multiple VPCs and on-premises networks via VPN. Network engineers report intermittent connectivity issues between VPC A and the on-premises network. The transit gateway route table shows the on-premises CIDR (10.0.0.0/8) propagated from the VPN attachment. VPC A has a subnet route pointing to the transit gateway for 10.0.0.0/8. Which step should the engineer take FIRST to diagnose the issue?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
Verify that the VPN tunnel status shows as UP on both sides.
Why wrong: While tunnel status is important, the issue could be due to route propagation or association problems, not tunnel status alone.
B
Enable VPC Flow Logs on VPC A to verify traffic reaching the transit gateway.
Why wrong: VPC Flow Logs capture traffic at the VPC level, not inside the transit gateway, so they won't show routing decisions within the transit gateway.
C
In the transit gateway route table, verify that the VPN attachment is correctly associated and that the 10.0.0.0/8 route is propagated and has the correct attachment.
This directly checks whether the transit gateway is correctly routing traffic to the VPN attachment for the on-premises CIDR.
D
Check the security group rules on the EC2 instances in VPC A for outbound traffic.
Why wrong: Security groups control inbound/outbound traffic to instances, but the issue is about network routing through the transit gateway.

Full breakdown with real-world context →

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

✓

In the transit gateway route table, verify that the VPN attachment is correctly associated and that the 10.0.0.0/8 route is propagated and has the correct attachment.

Option C is correct because the first diagnostic step for intermittent connectivity through a transit gateway is to verify the route table configuration. The engineer must confirm that the VPN attachment is correctly associated with the transit gateway route table and that the 10.0.0.0/8 route is propagated from the VPN attachment, as a missing or misassociated route would cause traffic to be dropped even if the VPN tunnel is up.

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 VPN tunnel status shows as UP on both sides.
Why it's wrong here
While tunnel status is important, the issue could be due to route propagation or association problems, not tunnel status alone.
✗
Enable VPC Flow Logs on VPC A to verify traffic reaching the transit gateway.
Why it's wrong here
VPC Flow Logs capture traffic at the VPC level, not inside the transit gateway, so they won't show routing decisions within the transit gateway.
✓
In the transit gateway route table, verify that the VPN attachment is correctly associated and that the 10.0.0.0/8 route is propagated and has the correct attachment.
Why this is correct
This directly checks whether the transit gateway is correctly routing traffic to the VPN attachment for the on-premises CIDR.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Check the security group rules on the EC2 instances in VPC A for outbound traffic.
Why it's wrong here
Security groups control inbound/outbound traffic to instances, but the issue is about network routing through the transit gateway.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often jump to checking the VPN tunnel status (Option A) first, assuming the tunnel is the root cause, but the question specifically describes intermittent connectivity that is more likely due to a routing misconfiguration in the transit gateway route table rather than a tunnel flap.

Trap categories for this question

Command / output trap
VPC Flow Logs capture traffic at the VPC level, not inside the transit gateway, so they won't show routing decisions within the transit gateway.

Detailed technical explanation

How to think about this question

AWS Transit Gateway uses route tables to determine how to forward traffic between attachments; a propagated route from a VPN attachment must be present and the attachment must be associated with the correct route table. Intermittent issues can arise from route propagation delays or misconfiguration of the VPN attachment association, which can be verified by inspecting the transit gateway route table for the 10.0.0.0/8 entry and its target attachment ID.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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: In the transit gateway route table, verify that the VPN attachment is correctly associated and that the 10.0.0.0/8 route is propagated and has the correct attachment. — Option C is correct because the first diagnostic step for intermittent connectivity through a transit gateway is to verify the route table configuration. The engineer must confirm that the VPN attachment is correctly associated with the transit gateway route table and that the 10.0.0.0/8 route is propagated from the VPN attachment, as a missing or misassociated route would cause traffic to be dropped even if the VPN tunnel is up.

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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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