AZ-305 Design infrastructure solutions Practice Question
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 company has multiple virtual networks in different Azure regions. They need to connect all VNets together securely over the Microsoft backbone. They also need to connect to an on-premises data center via ExpressRoute. The solution should support transitive routing between all connected networks. Which Azure service should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Virtual WAN
Azure Virtual WAN is the correct choice because it provides a hub-and-spoke architecture that supports transitive routing between all connected networks (multiple VNets across regions and on-premises via ExpressRoute) over the Microsoft backbone. It natively integrates ExpressRoute and VPN gateways into a single managed service, enabling seamless connectivity and routing between any spoke VNet, branch, or on-premises site without requiring manual peering or gateway transit configuration.
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.
✗
Azure Virtual Network Peering
Why it's wrong here
VNet peering is not transitive; each pair must be peered separately.
✗
Azure VPN Gateway
Why it's wrong here
VPNGateway can connect VNets but requires manual BGP configuration and does not provide transitive routing out of the box.
✓
Azure Virtual WAN
Why this is correct
Virtual WAN provides a hub that connects multiple VNets and on-premises sites with automatic transitive routing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure ExpressRoute Gateway
Why it's wrong here
ExpressRoute Gateway connects a single VNet to ExpressRoute; it does not connect multiple VNets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Azure Virtual Network Peering (Option A) because they assume peering supports transitive routing, but Azure explicitly does not allow transitive routing through peered VNets unless you use a hub VNet with a network virtual appliance or enable gateway transit, which is not the same as native transitive routing.
Detailed technical explanation
How to think about this question
Azure Virtual WAN uses a dynamic routing protocol (BGP) internally to propagate routes between all connected spokes, branches, and ExpressRoute circuits, ensuring transitive routing without manual route tables. Under the hood, each Virtual WAN hub contains a route table that automatically learns and advertises prefixes from connected ExpressRoute gateways, VPN gateways, and VNet connections, enabling any-to-any connectivity. In a real-world scenario, a global enterprise with VNets in US East, Europe, and Asia, plus an on-premises data center connected via ExpressRoute, can use a single Virtual WAN with multiple hubs to achieve full transitive routing without needing to peer each VNet pair individually.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Design infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Virtual WAN — Azure Virtual WAN is the correct choice because it provides a hub-and-spoke architecture that supports transitive routing between all connected networks (multiple VNets across regions and on-premises via ExpressRoute) over the Microsoft backbone. It natively integrates ExpressRoute and VPN gateways into a single managed service, enabling seamless connectivity and routing between any spoke VNet, branch, or on-premises site without requiring manual peering or gateway transit configuration.
What should I do if I get this AZ-305 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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