AZ-305 Design infrastructure solutions Practice Question
A company has multiple Azure subscriptions and wants to enforce consistent network policies across all VNets. They need to ensure that all traffic going out to the internet is inspected by a central firewall. The solution must be scalable and support multiple regions. What should they implement?
⚠ Common exam trap
Candidates often choose Option C (Azure Policy) because they confuse policy enforcement with actual traffic routing, not realizing that Azure Policy only audits or enforces configuration compliance, not dynamic traffic inspection paths.
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
✓
Use Azure Virtual WAN with a secured hub and Azure Firewall Manager
Azure Virtual WAN with a secured hub and Azure Firewall Manager provides a centralized, scalable solution for enforcing consistent network policies across multiple subscriptions and regions. It enables a hub-and-spoke architecture where all internet-bound traffic from VNets is routed through a central Azure Firewall for inspection, with Azure Firewall Manager offering global policy management and automated routing.
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 Azure Virtual WAN with a secured hub and Azure Firewall Manager
Why this is correct
Azure Virtual WAN with a secured hub consolidates all networking into a single managed backbone, and Azure Firewall Manager provides a consistent, central security policy applied across every hub in all subscriptions. This approach eliminates the need to configure per-subscription inspection, because routing and security are integrated. Firewall Manager also offers cross-subscription governance and centralized logging, making it the only option that delivers both scalable connectivity and mandatory traffic inspection at the enterprise level.
- ✗
Deploy Azure Firewall in each subscription and route traffic through it
Why it's wrong here
Placing a separate Azure Firewall in each subscription creates a decentralized security model that is operationally heavy and inconsistent. You must manage N firewall instances, configure individual route tables, and manually enforce identical policies across subscriptions, which easily leads to configuration drift. This approach does not scale because there is no single pane of glass for policy management, and it multiplies both cost and operational overhead without providing centralized traffic inspection.
- ✗
Use Azure Policy to enforce route tables on each VNet
Why it's wrong here
Azure Policy is a control-plane governance tool that can enforce the presence or configuration of route tables, but it does not inspect or filter actual network traffic. While it can deploy a UDR that points to a firewall, Azure Policy itself has no data-plane visibility and cannot validate that traffic is truly being inspected. Therefore, relying solely on Azure Policy cannot guarantee that packets pass through a security appliance; it only ensures that certain network resources exist or comply with definitions.
- ✗
Create VNet peering and use a network virtual appliance in one subscription
Why it's wrong here
VNet peering is non-transitive, and using a single network virtual appliance in one subscription forces all cross-subscription traffic to flow through a bottleneck that becomes a single point of failure. As the number of subscriptions and VNets grows, maintaining a mesh of peerings and complex UDRs to direct traffic to that one NVA becomes unmanageable. This approach also lacks centralized policy management and high availability, so it is not a viable enterprise-scale solution for enforcing traffic inspection across many subscriptions.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-305 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-305 exam.