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. The network team notices that traffic from a specific VPC to an on-premises network is being dropped. All other VPCs can reach the on-premises network. Which configuration should be checked first?
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.
Why wrong: Since other VPCs can reach on-premises, the firewall is not blocking all traffic; the issue is specific to one VPC.
B
Check the VPC's security groups
Why wrong: Security groups are stateful and apply at the instance level; if the issue is at the network layer, route tables are more likely.
C
Check the VPC's network ACLs
Why wrong: Network ACLs are stateless and apply at the subnet level, but the issue is specific to one VPC's traffic to on-premises; other VPCs work, so it's likely not a global ACL issue.
D
Check the Transit Gateway route tables
The Transit Gateway route table associated with the VPC attachment might be missing the route to the on-premises network.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the Transit Gateway route tables
The issue is isolated to one VPC, so route tables are the most likely cause. Transit Gateway route tables might not have the route for the on-premises network propagated from that VPC's attachment.
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.
✗
Check the on-premises firewall rules
Why it's wrong here
Since other VPCs can reach on-premises, the firewall is not blocking all traffic; the issue is specific to one VPC.
✗
Check the VPC's security groups
Why it's wrong here
Security groups are stateful and apply at the instance level; if the issue is at the network layer, route tables are more likely.
✗
Check the VPC's network ACLs
Why it's wrong here
Network ACLs are stateless and apply at the subnet level, but the issue is specific to one VPC's traffic to on-premises; other VPCs work, so it's likely not a global ACL issue.
✓
Check the Transit Gateway route tables
Why this is correct
The Transit Gateway route table associated with the VPC attachment might be missing the route to the on-premises network.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
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: Check the Transit Gateway route tables — The issue is isolated to one VPC, so route tables are the most likely cause. Transit Gateway route tables might not have the route for the on-premises network propagated from that VPC's attachment.
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.
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?
Standard ACLs match source addresses.
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