- A
Verify peering status, then check route tables, then check security groups and NACLs, then test connectivity, then use VPC Flow Logs
This is correct because you should first confirm the peering connection is active, then ensure routes point to the peered VPC, then verify security groups and NACLs allow traffic, test connectivity, and finally use flow logs if issues persist.
- B
Test connectivity, then check security groups and NACLs, then check route tables, then use VPC Flow Logs, then verify peering status
Why wrong: This is incorrect because testing before verifying the peering status and routes can waste time. Flow logs are a last resort, not a first step.
- C
Check security groups and NACLs, then check route tables, then verify peering status, then test connectivity, then use VPC Flow Logs
Why wrong: This is incorrect because you should verify the peering connection is active before checking security groups, as an inactive peering will block all traffic regardless of rules.
- D
Use VPC Flow Logs, then verify peering status, then check route tables, then check security groups and NACLs, then test connectivity
Why wrong: This is incorrect because flow logs are meant for analysis after simpler checks fail. Starting with flow logs is inefficient and may not address the root cause.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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.
Order the steps to troubleshoot an inter-Region VPC peering connection that is not working:
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 peering status, then check route tables, then check security groups and NACLs, then test connectivity, then use VPC Flow Logs
First verify peering status, then check routes, then security groups/ACLs, then test, then use flow logs.
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.
- ✓
Verify peering status, then check route tables, then check security groups and NACLs, then test connectivity, then use VPC Flow Logs
Why this is correct
This is correct because you should first confirm the peering connection is active, then ensure routes point to the peered VPC, then verify security groups and NACLs allow traffic, test connectivity, and finally use flow logs if issues persist.
Related concept
Standard ACLs match source addresses.
- ✗
Test connectivity, then check security groups and NACLs, then check route tables, then use VPC Flow Logs, then verify peering status
Why it's wrong here
This is incorrect because testing before verifying the peering status and routes can waste time. Flow logs are a last resort, not a first step.
- ✗
Check security groups and NACLs, then check route tables, then verify peering status, then test connectivity, then use VPC Flow Logs
Why it's wrong here
This is incorrect because you should verify the peering connection is active before checking security groups, as an inactive peering will block all traffic regardless of rules.
- ✗
Use VPC Flow Logs, then verify peering status, then check route tables, then check security groups and NACLs, then test connectivity
Why it's wrong here
This is incorrect because flow logs are meant for analysis after simpler checks fail. Starting with flow logs is inefficient and may not address the root cause.
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.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Verify peering status, then check route tables, then check security groups and NACLs, then test connectivity, then use VPC Flow Logs — First verify peering status, then check routes, then security groups/ACLs, then test, then use flow logs.
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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Last reviewed: Jun 11, 2026
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