The correct answer is to set up a transit VPC with a firewall appliance and route traffic through it. This design creates a centralized hub VPC that hosts a next-generation firewall, with all spoke VPCs peered or connected via VPN to this hub. By adjusting route tables in each spoke to send traffic destined for other VPCs through the transit VPC’s firewall appliance, every inter-VPC packet is forced through inspection, ensuring full security policy compliance. On the CompTIA Cloud+ CV0-004 exam, this tests your understanding of network segmentation and centralized security controls—a common trap is assuming VPC peering alone provides inspection, but native peering bypasses firewalls. Remember the memory tip: “Hub for the scrub”—the transit VPC acts as the central hub where all traffic gets scrubbed by the firewall before reaching another spoke.
CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and 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.
An organization uses a cloud-based infrastructure with multiple VPCs peered together. The security team notices that traffic between VPCs is not being inspected by the central firewall. What design change should be implemented to ensure all inter-VPC traffic passes through a centralized firewall?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up a transit VPC with a firewall appliance and route traffic through it
Option C is correct because a transit VPC architecture uses a centralized hub VPC containing a firewall appliance (e.g., a next-generation firewall) and routes all inter-VPC traffic through it via VPC peering or VPN connections. By configuring route tables in each spoke VPC to point the destination CIDR of other VPCs to the transit VPC's firewall, every packet between VPCs is forced through the firewall for inspection, ensuring compliance with security policies.
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.
✗
Use VPC endpoints for all inter-VPC communication
Why it's wrong here
VPC endpoints are for accessing AWS services, not for routing traffic between VPCs.
✗
Apply network ACLs to all subnets in each VPC
Why it's wrong here
Network ACLs are stateless and not designed for application-level inspection.
✓
Set up a transit VPC with a firewall appliance and route traffic through it
Why this is correct
A transit VPC acts as a hub, routing all inter-VPC traffic through a central firewall for inspection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement VPC peering between all VPCs and attach a firewall to each VPC
Why it's wrong here
This does not centralize inspection; traffic would still flow directly between peered VPCs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse VPC peering (which allows direct, non-inspected traffic) with a transit VPC (which forces traffic through a central inspection point), or they mistakenly think network ACLs or VPC endpoints can provide centralized traffic inspection.
Detailed technical explanation
How to think about this question
In a transit VPC design, the hub VPC hosts a firewall (e.g., Palo Alto Networks VM-Series or AWS Network Firewall) and uses BGP over VPN or static routes to propagate routes to spoke VPCs. The firewall performs stateful inspection, intrusion prevention, and logging; route tables in each spoke VPC must have a default route or specific routes pointing to the transit VPC's firewall ENI, and the firewall must be configured to forward traffic between spokes after inspection. This architecture scales better than full-mesh peering and avoids the 125-VPC peering limit per VPC in AWS.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cloud Architecture and Design — This question tests Cloud Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up a transit VPC with a firewall appliance and route traffic through it — Option C is correct because a transit VPC architecture uses a centralized hub VPC containing a firewall appliance (e.g., a next-generation firewall) and routes all inter-VPC traffic through it via VPC peering or VPN connections. By configuring route tables in each spoke VPC to point the destination CIDR of other VPCs to the transit VPC's firewall, every packet between VPCs is forced through the firewall for inspection, ensuring compliance with security policies.
What should I do if I get this CV0-004 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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Question Discussion
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