- A
AWS Transit Gateway
Transit Gateway can route traffic between VPCs with route tables enabling inspection.
- B
VPC Peering
Why wrong: VPC Peering does not support transitive routing; each pair must be peered.
- C
VPC Endpoint
Why wrong: VPC Endpoints provide private access to AWS services, not inter-VPC routing.
- D
Network Load Balancer
Why wrong: NLB distributes traffic to targets, not route inter-VPC traffic.
Question 1,122 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 wants to ensure that traffic between Amazon EC2 instances in the same VPC but different subnets is inspected by a network security appliance. The appliance is deployed in a separate security VPC. Which AWS service should be used to route traffic through the security VPC?
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
✓
AWS Transit Gateway
AWS Transit Gateway acts as a hub-and-spoke router that can interconnect multiple VPCs, including a security VPC, and centrally route traffic between them. By attaching both the workload VPC and the security VPC to a Transit Gateway, you can configure route tables to force all inter-subnet traffic (or inter-VPC traffic) through the network security appliance in the security VPC. This enables inspection without requiring a full mesh of VPC peering connections or complex routing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AWS Transit Gateway
Why this is correct
Transit Gateway can route traffic between VPCs with route tables enabling inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
VPC Peering
Why it's wrong here
VPC Peering does not support transitive routing; each pair must be peered.
- ✗
VPC Endpoint
Why it's wrong here
VPC Endpoints provide private access to AWS services, not inter-VPC routing.
- ✗
Network Load Balancer
Why it's wrong here
NLB distributes traffic to targets, not route inter-VPC traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC Peering with transitive routing, assuming that multiple peering connections can chain traffic through a middle VPC, but AWS explicitly prohibits transitive routing through VPC peering.
Detailed technical explanation
How to think about this question
Transit Gateway uses a dynamic routing protocol (BGP) over VPN attachments or static routes for VPC attachments, and its route tables support route propagation and blackhole routes. In this scenario, you would create a Transit Gateway route table for the workload VPC that points the destination CIDR of the other subnet to the security VPC attachment, and the security VPC's route table points back to the workload VPC attachment after inspection. This allows the appliance (e.g., a firewall or IDS/IPS) to receive traffic, inspect it, and forward it to the destination subnet, all within a single, centrally managed hub.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Transit Gateway — AWS Transit Gateway acts as a hub-and-spoke router that can interconnect multiple VPCs, including a security VPC, and centrally route traffic between them. By attaching both the workload VPC and the security VPC to a Transit Gateway, you can configure route tables to force all inter-subnet traffic (or inter-VPC traffic) through the network security appliance in the security VPC. This enables inspection without requiring a full mesh of VPC peering connections or complex routing.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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