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 network engineer is troubleshooting network connectivity issues in a VPC. The engineer suspects that the network ACL is blocking traffic. Which TWO actions should the engineer take to verify this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the inbound and outbound rules of the network ACL.
Options A and C are correct because reviewing NACL rules and enabling VPC Flow Logs with ACL accept/reject status can identify blocked traffic. Option B is wrong because security groups are stateful and work differently. Option D is wrong because CloudTrail does not log network traffic. Option E is wrong because Direct Connect is unrelated.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Review the inbound and outbound rules of the network ACL.
Why this is correct
NACL rules explicitly allow or deny traffic.
Related concept
Standard ACLs match source addresses.
✗
Check the security group rules for the affected instances.
Why it's wrong here
Security groups are stateful and not directly related to NACL blocking.
✗
Use AWS CloudTrail to view network traffic logs.
Why it's wrong here
CloudTrail logs API calls, not network traffic.
✓
Enable VPC Flow Logs and filter for 'ACCEPT' or 'REJECT' status.
Why this is correct
Flow Logs can show whether NACL accepted or rejected packets.
Related concept
Standard ACLs match source addresses.
✗
Test connectivity using AWS Direct Connect.
Why it's wrong here
Direct Connect is for on-premises connectivity, not troubleshooting NACL.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
Network Management and Operations — This question tests Network Management and Operations — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Review the inbound and outbound rules of the network ACL. — Options A and C are correct because reviewing NACL rules and enabling VPC Flow Logs with ACL accept/reject status can identify blocked traffic. Option B is wrong because security groups are stateful and work differently. Option D is wrong because CloudTrail does not log network traffic. Option E is wrong because Direct Connect is unrelated.
What should I do if I get this ANS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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