This AZ-305 practice question tests your understanding of design infrastructure solutions. 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 multinational corporation is designing a hub-spoke network topology in Azure to connect multiple on-premises sites and Azure regions. The hub contains Azure Firewall and Azure Bastion. Spokes are in different regions and need to communicate with each other through the hub. The solution must minimize latency and cost. What should you configure?
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.
Connect spokes via ExpressRoute Global Reach
Why wrong: Bypasses hub firewall and incurs additional cost.
Deploy Azure Virtual WAN with secured hub
Why wrong: More expensive and complex than needed.
Use VNet peering to hub and UDRs to force traffic through Azure Firewall
Allows inspection with minimal cost and latency.
Create VNet peering between spokes directly
Why wrong: Bypasses hub firewall and security inspection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use VNet peering to hub and UDRs to force traffic through Azure Firewall
Option D is correct because VNet peering with traffic forced through the hub firewall using user-defined routes (UDRs) allows spoke-to-spoke traffic to be inspected, minimizing additional cost. Option A is wrong because ExpressRoute Global Reach bypasses the hub firewall. Option B is wrong because Azure Virtual WAN is more expensive and complex. Option C is wrong because spoke-to-spoke direct peering bypasses the hub firewall.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Connect spokes via ExpressRoute Global Reach
Why it's wrong here
Bypasses hub firewall and incurs additional cost.
Deploy Azure Virtual WAN with secured hub
Why it's wrong here
More expensive and complex than needed.
Use VNet peering to hub and UDRs to force traffic through Azure Firewall
Why this is correct
Allows inspection with minimal cost and latency.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Create VNet peering between spokes directly
Why it's wrong here
Bypasses hub firewall and security inspection.
Common exam traps
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
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.
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
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
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 AZ-305 NAT questions on configuration and troubleshooting.
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FAQ
Design infrastructure solutions — This question tests Design infrastructure solutions — Static NAT maps one inside address to one outside address..
The correct answer is: Use VNet peering to hub and UDRs to force traffic through Azure Firewall — Option D is correct because VNet peering with traffic forced through the hub firewall using user-defined routes (UDRs) allows spoke-to-spoke traffic to be inspected, minimizing additional cost. Option A is wrong because ExpressRoute Global Reach bypasses the hub firewall. Option B is wrong because Azure Virtual WAN is more expensive and complex. Option C is wrong because spoke-to-spoke direct peering bypasses the hub firewall.
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 AZ-305 NAT questions on configuration and troubleshooting.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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