Azure VNet Peering is the correct choice because it directly connects two or more Azure Virtual Networks using the Microsoft backbone infrastructure, enabling a hub-and-spoke VNet peering topology where multiple spoke VNets communicate through a central hub VNet without traversing the public internet. This service provides low-latency, private connectivity and supports transitive routing only when explicitly configured via a network virtual appliance or Azure Route Server in the hub. On the AZ-900 exam, this concept tests your understanding of core networking services and how they enable scalable, secure architectures—often appearing in scenario-based questions that contrast VNet Peering with VPN Gateway or ExpressRoute. A common trap is assuming VNet Peering automatically supports transitive routing between spokes; it does not unless you add an NVA in the hub. Memory tip: think of a bicycle wheel—the hub is the central VNet, the spokes are the connected VNets, and VNet Peering is the spoke that physically links each spoke to the hub.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
Which Azure networking service enables you to create a hub-and-spoke network topology where multiple VNets are connected and can communicate through a central hub VNet?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure VNet Peering
Azure VNet Peering is the correct service because it directly connects two or more Azure Virtual Networks (VNets) using the Microsoft backbone infrastructure, enabling a hub-and-spoke topology where multiple spoke VNets communicate through a central hub VNet. Unlike VPN-based solutions, VNet Peering provides low-latency, private connectivity without traversing the public internet, and it supports transitive routing only when explicitly configured via a network virtual appliance (NVA) or Azure Route Server in the hub.
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 VPN Gateway
Why it's wrong here
VPNGateway connects Azure to on-premises networks — for VNet-to-VNet within Azure, VNet Peering is simpler and faster.
✓
Azure VNet Peering
Why this is correct
VNet Peering connects VNets for private communication and enables hub-and-spoke topologies with low-latency, high-bandwidth connectivity.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Load Balancer
Why it's wrong here
Load Balancer distributes traffic within or across resource pools — it doesn't connect separate VNets.
✗
Azure Front Door
Why it's wrong here
Front Door is a global application delivery service — it doesn't connect VNets at the network level.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VNet Peering with VPNGateway, assuming that a VPN connection is required to link VNets, but VNet Peering is the native, higher-performance, and lower-latency solution for connecting VNets within Azure without internet-based encryption overhead.
Detailed technical explanation
How to think about this question
VNet Peering uses the Azure backbone network to route traffic between VNets with no intermediate gateways, offering bandwidth equivalent to the VNet's NIC capacity and sub-2ms latency within the same region. A key subtlety is that VNet Peering is non-transitive by default—if VNet A is peered to VNet B and VNet B is peered to VNet C, VNet A cannot directly reach VNet C unless you configure a hub VNet with an NVA or use Azure Virtual WAN for transitive routing. In a real-world scenario, enterprises often deploy a hub VNet containing shared services (e.g., firewalls, DNS, Active Directory) and peer spoke VNets to it, enabling centralized security and management while maintaining isolated workload boundaries.
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-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure VNet Peering — Azure VNet Peering is the correct service because it directly connects two or more Azure Virtual Networks (VNets) using the Microsoft backbone infrastructure, enabling a hub-and-spoke topology where multiple spoke VNets communicate through a central hub VNet. Unlike VPN-based solutions, VNet Peering provides low-latency, private connectivity without traversing the public internet, and it supports transitive routing only when explicitly configured via a network virtual appliance (NVA) or Azure Route Server in the hub.
What should I do if I get this AZ-900 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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