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.
Refer to the exhibit. A network engineer is analyzing VPC Flow Logs to troubleshoot connectivity issues. The engineer notices that traffic from 10.0.1.5 to 192.168.1.1 on port 80 is logged as ACCEPT, but the application team reports that the web request failed. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The destination host 192.168.1.1 is not reachable or does not have a route back to the source.
The VPC Flow Logs record the state of the TCP handshake from the perspective of the network path, but they do not confirm that the destination host successfully processed the request or that a return path exists. If 192.168.1.1 has no route back to 10.0.1.5, the initial SYN-ACK will never reach the source, causing the application to time out even though the forward traffic was accepted by the network ACL and security group.
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 Flow Logs are not capturing all packets due to sampling.
Why it's wrong here
The log entry shows a specific captured packet; sampling would not affect this particular log.
✗
The network ACL is returning an ICMP unreachable message that is not logged.
Why it's wrong here
Network ACLs are stateless and would affect both directions; if ICMP were blocked, it would not cause an ACCEPT log.
✓
The destination host 192.168.1.1 is not reachable or does not have a route back to the source.
Why this is correct
The outbound packet was accepted, but the lack of a return path or the destination being down would cause the application to fail.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The security group on the ENI is blocking outbound traffic to 192.168.1.1.
Why it's wrong here
The log shows ACCEPT, so the security group allowed the outbound traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that an ACCEPT log entry guarantees end-to-end connectivity, when in fact it only confirms that the packet passed the hypervisor-level firewall rules, not that the destination host processed it or that a return path exists.
Trap categories for this question
Command / output trap
The log entry shows a specific captured packet; sampling would not affect this particular log.
Detailed technical explanation
How to think about this question
VPC Flow Logs capture metadata about IP traffic, including the action (ACCEPT/REJECT) based on the network ACL and security group evaluation at the hypervisor level. However, they do not track whether the destination host actually responds; a missing return route (e.g., no VPC peering or VPN route, or a misconfigured route table on the destination side) will cause the TCP three-way handshake to fail silently, resulting in a connection timeout at the application layer. This is a classic asymmetric routing scenario where forward traffic succeeds but return traffic is dropped.
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
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.
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 destination host 192.168.1.1 is not reachable or does not have a route back to the source. — The VPC Flow Logs record the state of the TCP handshake from the perspective of the network path, but they do not confirm that the destination host successfully processed the request or that a return path exists. If 192.168.1.1 has no route back to 10.0.1.5, the initial SYN-ACK will never reach the source, causing the application to time out even though the forward traffic was accepted by the network ACL and security group.
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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Question Discussion
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