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Question 1,420 of 1,705

Network Design →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use a single Transit Gateway with separate route tables for development and production VPCs, and a shared route table for the on-premises attachment. This approach achieves Transit Gateway hybrid isolation by allowing each VPC group to have its own isolated routing domain while both groups can reach the on-premises network through a common route table associated with the Direct Connect attachment. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of Transit Gateway route table segmentation as a scalable, cost-effective alternative to VPC peering or multiple transit gateways. A common trap is assuming you need separate Transit Gateways for isolation, which adds cost and complexity, or using a single route table that would allow cross-environment traffic. Remember the memory tip: “One gateway, three tables—dev, prod, and shared on-prem.”

ANS-C01 Network Design Practice Question

This ANS-C01 practice question tests your understanding of network design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 designing a hybrid network using AWS Transit Gateway with multiple VPCs and an on-premises data center connected via AWS Direct Connect. The VPCs need to communicate with each other and with on-premises, but must isolate development VPCs from production VPCs. What is the MOST scalable and cost-effective approach?

Question 1hardmultiple choice

Full question →

A
Use a single Transit Gateway with one route table for all VPCs and on-premises, and use network ACLs for isolation.
Why wrong: Network ACLs are stateless and harder to manage; Transit Gateway route tables provide better isolation.
B
Create VPC peering connections between all VPCs and a Direct Connect gateway for on-premises connectivity.
Why wrong: VPC peering requires full mesh and does not scale; no isolation granularity.
C
Use a VPN connection from each VPC to on-premises over Direct Connect, and allow VPC communication via VPN.
Why wrong: Multiple VPNs increase complexity and cost; Transit Gateway is simpler.
D
Use a single Transit Gateway with separate route tables for development and production VPCs, and a shared route table for on-premises attachment.
Separate route tables enforce isolation; shared table allows on-premises access.

Full breakdown with real-world context →

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

✓

Use a single Transit Gateway with separate route tables for development and production VPCs, and a shared route table for on-premises attachment.

Option A is correct because Transit Gateway route tables allow isolation between VPCs while sharing connectivity to on-premises. Option B is wrong because VPC peering does not scale and requires full mesh. Option C is wrong because a single route table would not isolate development and production. Option D is wrong because VPN over Direct Connect adds complexity and cost without benefit.

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.

✗
Use a single Transit Gateway with one route table for all VPCs and on-premises, and use network ACLs for isolation.
Why it's wrong here
Network ACLs are stateless and harder to manage; Transit Gateway route tables provide better isolation.
✗
Create VPC peering connections between all VPCs and a Direct Connect gateway for on-premises connectivity.
Why it's wrong here
VPC peering requires full mesh and does not scale; no isolation granularity.
✗
Use a VPN connection from each VPC to on-premises over Direct Connect, and allow VPC communication via VPN.
Why it's wrong here
Multiple VPNs increase complexity and cost; Transit Gateway is simpler.
✓
Use a single Transit Gateway with separate route tables for development and production VPCs, and a shared route table for on-premises attachment.
Why this is correct
Separate route tables enforce isolation; shared table allows on-premises access.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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 Design — This question tests Network Design — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Use a single Transit Gateway with separate route tables for development and production VPCs, and a shared route table for on-premises attachment. — Option A is correct because Transit Gateway route tables allow isolation between VPCs while sharing connectivity to on-premises. Option B is wrong because VPC peering does not scale and requires full mesh. Option C is wrong because a single route table would not isolate development and production. Option D is wrong because VPN over Direct Connect adds complexity and cost without benefit.

What should I do if I get this ANS-C01 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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