This SCS-C02 practice question tests your understanding of infrastructure security. 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 company is using AWS Transit Gateway to connect multiple VPCs and on-premises networks via VPN. The security team wants to inspect all traffic between VPCs before it reaches its destination. Which architecture should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a Transit Gateway with a central inspection VPC that hosts security appliances and route all inter-VPC traffic through it.
Option B is correct because Transit Gateway supports centralised inspection by routing traffic through a security appliance in a dedicated VPC. Option A is wrong because VPC Peering does not support central inspection. Option C is wrong because Direct Connect is for on-premises, not VPC-to-VPC. Option D is wrong because VPN CloudHub is for connecting multiple VPNs, not for inspection.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 VPN CloudHub to connect VPCs and inspect traffic at the VPN endpoint.
Why it's wrong here
VPN CloudHub is for connecting remote networks, not for inspection.
✗
Use AWS Direct Connect to connect VPCs and inspect traffic on-premises.
Why it's wrong here
Direct Connect is for on-premises connectivity, not VPC-to-VPC.
✓
Use a Transit Gateway with a central inspection VPC that hosts security appliances and route all inter-VPC traffic through it.
Why this is correct
This allows centralized traffic inspection.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use VPC Peering and configure security groups on each VPC to allow only necessary traffic.
Why it's wrong here
VPC Peering does not provide a central inspection point.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
Infrastructure Security — This question tests Infrastructure Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a Transit Gateway with a central inspection VPC that hosts security appliances and route all inter-VPC traffic through it. — Option B is correct because Transit Gateway supports centralised inspection by routing traffic through a security appliance in a dedicated VPC. Option A is wrong because VPC Peering does not support central inspection. Option C is wrong because Direct Connect is for on-premises, not VPC-to-VPC. Option D is wrong because VPN CloudHub is for connecting multiple VPNs, not for inspection.
What should I do if I get this SCS-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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