MSDEVBUILD / azure

Azure Virtual WAN

Internet Office VNet 10.0.0.0/16 web subnet data subnet ✓NSG LOAD BAL. VNet 2 🗄️Storage (PaaS) Azure DNS Virtual WAN joins many offices and networks through one hub
Virtual WAN is a central train station: every office and network connects once and can reach the rest.

😟 THE PROBLEM

Hundreds of offices and networks connected point-to-point, making a fragile spaghetti network.

😊 THE SOLUTION

Connect everything to Microsoft-managed Virtual WAN hubs.

  • A tangle of separate VPNs✓ One managed hub per region
  • Branch traffic via head office✓ Any-to-any transit
  • Building hubs yourself✓ Microsoft manages the hub
🛠️ Solved with: Azure Virtual WAN
Module 2: Architecture & Services ⏱ 5 min read Updated 11 Nov 2026 Beyond the exam: real-world knowledge

Quick answer

Azure Virtual WAN is a networking service that brings many networking, security and routing features together in one place. Microsoft-managed hubs connect your branch offices (VPN or SD-WAN), remote users, ExpressRoute circuits and virtual networks, so everything can reach everything through the Microsoft global network without you building and maintaining the hub yourself.

Start with a question

Your company has 200 shops, 3 Azure regions and 5,000 remote workers. How do you connect them all without a spaghetti diagram?

You use Azure Virtual WAN: central hubs that Microsoft runs, which everything plugs into.

Explain it like I’m 10

The technical explanation

Virtual WAN uses Microsoft-managed hubs in each region. You connect site-to-site VPN or SD-WAN branches, point-to-site users, ExpressRoute circuits and VNets to the hubs, and Virtual WAN handles routing and transit between them, optionally with Azure Firewall in a secured hub.

Real-world business scenario

Retail

A retail chain with 200 stores

The problem
Each store had its own VPN to Azure and store-to-store traffic went through the head office, causing slowness and a fragile network.
What they used
Azure Virtual WAN hubs in two regions with stores connected through SD-WAN devices.
Why that choice
Managed, any-to-any connectivity at scale.
The result
Simpler operations, faster store-to-store traffic and easier onboarding of new stores.

When to use it and when not to

✓ Use it when…

  • Many branches or regions.
  • SD-WAN integration and global transit.

✕ Think twice when…

  • Small single-region networks.
Ready for more?The full lesson adds the technical explanation, when to use it, interview questions and revision notes.

Interview preparation

Say your answer out loud first, then open the model answer. Interviewers care more about your reasoning than the exact words.

Beginner What is Azure Virtual WAN?

Model answer

A managed service that connects all my offices, remote users and Azure networks through central hubs that Microsoft runs, instead of me building a complicated network myself.

Intermediate How is Virtual WAN different from building hub-and-spoke yourself?

Model answer

In a customer-managed hub-and-spoke I build the hub VNet, gateways, firewall and routing. Virtual WAN provides the hub as a managed service with automatic routing, any-to-any transit and easy branch onboarding, which suits large, multi-region estates.

Experienced developer When is Virtual WAN overkill?

Model answer

For a small estate with a handful of VNets in one region and one VPN. A simple hub-and-spoke with peering is cheaper and easier there. Virtual WAN shines with many branches, many regions or SD-WAN integration.

Test yourself with exercises

3 original practice questions in the AZ-900 style. Pick your answers, then check them. You will see why each option is right or wrong. Score 75% or more and this topic is marked complete.

Question 1

Question 1 of 3

Which service provides Microsoft-managed hubs to connect many branches, remote users, ExpressRoute and VNets?

Question 2

Question 2 of 3

For a small company with two VNets in one region, what is usually simpler than Virtual WAN?

Question 3

Question 3 of 3

Who manages a Virtual WAN hub?

Quick revision

Key points

  • Virtual WAN = managed hubs connecting branches, users, ExpressRoute and VNets.
  • Any-to-any connectivity through the Microsoft network.
  • Best for large, multi-site, multi-region networks.

Important terminology

Virtual WAN hub
A Microsoft-managed virtual network that acts as the central connection point in a region.
Branch
A remote office connected through VPN or SD-WAN.
Transit
Traffic passing through a hub between other networks, such as branch to branch.

Common mistakes

  • Using Virtual WAN for a tiny network where peering is enough.

Exam tips

  • Not in the current AZ-900 outline, but useful context for networking interviews.

Five quick revision questions

  1. 1.What does Virtual WAN provide?Show

    Managed hubs connecting branches, users, ExpressRoute and VNets.

  2. 2.Who manages the Virtual WAN hub?Show

    Microsoft.

  3. 3.What is transit traffic?Show

    Traffic passing through a hub between other networks.

  4. 4.When is Virtual WAN most useful?Show

    Large networks with many branches or regions.

  5. 5.What is a simpler alternative for small estates?Show

    Hub-and-spoke with VNet peering.

Official references

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