- A
Attach the new VPC to the existing transit gateway and ensure the transit gateway route tables permit traffic between the new VPC and the RDS VPC.
Correct: Leveraging existing transit gateway minimizes routing changes.
- B
Set up a VPN connection from the new VPC to the on-premises network, and route traffic through on-premises to the RDS VPC.
Why wrong: Incorrect: This adds latency and unnecessary hops.
- C
Create a VPC peering connection between the new VPC and the RDS VPC.
Why wrong: Incorrect: VPC peering requires route table modifications in both VPCs, increasing complexity.
- D
Migrate the RDS database to the new VPC to keep the application and database in the same VPC.
Why wrong: Incorrect: Moving the database may cause downtime and is not minimal change.
Quick Answer
The correct choice is to attach the new VPC to the existing transit gateway and ensure the transit gateway route tables permit traffic between the new VPC and the RDS VPC. This works because AWS Transit Gateway acts as a central hub, allowing you to migrate an app with low-latency RDS access without modifying any existing routing—the new VPC simply plugs into the existing hub, and the route tables control east-west traffic between the RDS VPC and the new VPC. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of Transit Gateway’s ability to scale hybrid networks while preserving existing Direct Connect and VPC configurations. A common trap is choosing VPC peering, which forces you to update route tables in both VPCs, or moving the RDS instance, which breaks the database endpoint. Remember the memory tip: “Hub, don’t pair—attach, don’t move.”
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 has a hybrid network with multiple VPCs connected via AWS Transit Gateway and an on-premises network via Direct Connect. The network team is planning to migrate a legacy application from on-premises to a new VPC. The application requires low-latency access to an RDS database running in an existing VPC. The team wants to minimize changes to the existing routing. What should the team do to meet these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Attach the new VPC to the existing transit gateway and ensure the transit gateway route tables permit traffic between the new VPC and the RDS VPC.
Option D is correct because attaching the new VPC to the existing transit gateway allows immediate connectivity to the RDS VPC without changing existing routes, provided the route tables are configured correctly. Option A is wrong because VPC peering requires route table updates in both VPCs. Option B is wrong because a VPN connection adds complexity and latency. Option C is wrong because moving the RDS instance changes the database endpoint and may cause downtime.
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.
- ✓
Attach the new VPC to the existing transit gateway and ensure the transit gateway route tables permit traffic between the new VPC and the RDS VPC.
Why this is correct
Correct: Leveraging existing transit gateway minimizes routing changes.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
Set up a VPN connection from the new VPC to the on-premises network, and route traffic through on-premises to the RDS VPC.
Why it's wrong here
Incorrect: This adds latency and unnecessary hops.
- ✗
Create a VPC peering connection between the new VPC and the RDS VPC.
Why it's wrong here
Incorrect: VPC peering requires route table modifications in both VPCs, increasing complexity.
- ✗
Migrate the RDS database to the new VPC to keep the application and database in the same VPC.
Why it's wrong here
Incorrect: Moving the database may cause downtime and is not minimal change.
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 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.
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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Network Management and Operations — study guide chapter
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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 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Attach the new VPC to the existing transit gateway and ensure the transit gateway route tables permit traffic between the new VPC and the RDS VPC. — Option D is correct because attaching the new VPC to the existing transit gateway allows immediate connectivity to the RDS VPC without changing existing routes, provided the route tables are configured correctly. Option A is wrong because VPC peering requires route table updates in both VPCs. Option B is wrong because a VPN connection adds complexity and latency. Option C is wrong because moving the RDS instance changes the database endpoint and may cause downtime.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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