- A
VNet peering between all VNets and use route tables for forced tunneling.
Why wrong: While VNet peering can connect VNets, managing multiple peering connections and route tables becomes complex and error-prone. Enforcing forced tunneling through a central firewall requires additional configuration and is not centralized.
- B
Azure Virtual WAN with a secured hub in East US.
Azure Virtual WAN provides a scalable hub-and-spoke architecture with centralized routing. A secured hub can include a firewall to enforce forced tunneling and security policies. All VNets and on-premises connect to the hub(s), simplifying management.
- C
ExpressRoute Global Reach with VNet peering to connect all VNets.
Why wrong: ExpressRoute Global Reach connects on-premises networks to ExpressRoute circuits in different regions but does not directly connect VNets to each other. Additional VNet peering is required, and centralized security policy enforcement is not built-in.
- D
VPN gateways with BGP to connect all VNets.
Why wrong: Setting up VPN gateways and BGP between multiple VNets is complex and not as scalable as Virtual WAN. It also lacks centralized routing and security policy enforcement.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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 has multiple Azure virtual networks (VNets) spread across three Azure regions (West US, East US, and West Europe). They also have an on-premises network connected to East US via ExpressRoute. They need to connect all VNets to each other and to the on-premises network. They require centralized management of routing and the ability to enforce security policies such as forcing all internet-bound traffic from any VNet to pass through a central firewall in East US. Which Azure solution should they implement?
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
Azure Virtual WAN with a secured hub in East US.
Azure Virtual WAN with a secured hub in East US provides a centralized hub-and-spoke architecture that connects all VNets and the on-premises network via ExpressRoute. The secured hub includes Azure Firewall, enabling forced tunneling of all internet-bound traffic from any VNet through the central firewall in East US, while Virtual WAN automatically manages routing between all spokes and the on-premises network.
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.
- ✗
VNet peering between all VNets and use route tables for forced tunneling.
Why it's wrong here
While VNet peering can connect VNets, managing multiple peering connections and route tables becomes complex and error-prone. Enforcing forced tunneling through a central firewall requires additional configuration and is not centralized.
- ✓
Azure Virtual WAN with a secured hub in East US.
Why this is correct
Azure Virtual WAN provides a scalable hub-and-spoke architecture with centralized routing. A secured hub can include a firewall to enforce forced tunneling and security policies. All VNets and on-premises connect to the hub(s), simplifying management.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
ExpressRoute Global Reach with VNet peering to connect all VNets.
Why it's wrong here
ExpressRoute Global Reach connects on-premises networks to ExpressRoute circuits in different regions but does not directly connect VNets to each other. Additional VNet peering is required, and centralized security policy enforcement is not built-in.
- ✗
VPN gateways with BGP to connect all VNets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VNet peering with route tables (Option A) is sufficient for centralized security, but they overlook the operational complexity and lack of built-in forced tunneling enforcement across multiple regions, which Virtual WAN's secured hub solves natively.
Detailed technical explanation
How to think about this question
Azure Virtual WAN uses a hub-and-spoke topology where the hub is a managed virtual network that contains the VPN gateway, ExpressRoute gateway, and Azure Firewall. Routing is automatically propagated via BGP between the hub and all connected VNets and on-premises networks, eliminating the need for user-defined routes (UDRs) in most scenarios. The secured hub's Azure Firewall can be configured with forced tunneling policies that redirect all internet-bound traffic from spoke VNets through the firewall, using default routes (0.0.0.0/0) with next hop set to the firewall's private IP.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-305 question test?
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 with a secured hub in East US. — Azure Virtual WAN with a secured hub in East US provides a centralized hub-and-spoke architecture that connects all VNets and the on-premises network via ExpressRoute. The secured hub includes Azure Firewall, enabling forced tunneling of all internet-bound traffic from any VNet through the central firewall in East US, while Virtual WAN automatically manages routing between all spokes and the on-premises network.
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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Last reviewed: Jun 11, 2026
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