The answer is Azure Virtual Network Peering, which enables resources in different Azure virtual networks to communicate as if they were on the same network by using Microsoft’s backbone infrastructure rather than routing traffic over the public internet. This direct, low-latency connection eliminates the need for a VPN gateway or encryption overhead, making it ideal for high-bandwidth cross-VNet communication. On the AZ-900 exam, this question tests your understanding of foundational networking features, often appearing alongside distractors like VPN Gateway or Azure DNS. A common trap is assuming peering supports automatic transitive routing—it does not; you must explicitly configure a hub-and-spoke topology for that. To remember, think of peering as a private, direct “bridge” between VNets: no internet, no encryption, just a fast lane on Microsoft’s highway.
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 feature enables resources in different Azure virtual networks to communicate as if they were on the same network?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Virtual Network Peering
Azure Virtual Network Peering (Option B) connects two or more Azure virtual networks (VNets) directly using the Microsoft backbone infrastructure, enabling resources in each VNet to communicate with each other as if they were on the same network. Unlike a VPNgateway, peering does not require a public internet hop or encryption overhead, and it supports transitive routing only when explicitly configured via a hub-and-spoke topology. This makes it the correct choice for low-latency, high-bandwidth cross-VNet communication.
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 networks over the internet; VNet Peering is a direct Azure backbone connection.
✓
Azure Virtual Network Peering
Why this is correct
VNet Peering directly connects two VNets via the Azure backbone, enabling private IP communication between them.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure ExpressRoute
Why it's wrong here
ExpressRoute connects on-premises to Azure; VNet Peering connects VNets within Azure.
✗
Azure Private Link
Why it's wrong here
Private Link provides private access to Azure services; VNet Peering connects two full VNets together.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure VPNGateway (which can also connect VNets) with VNet Peering, but VPN Gateway introduces encryption and gateway overhead, while peering is a direct, low-latency connection that does not require a gateway and is the intended solution for same-network-like communication between VNets.
Detailed technical explanation
How to think about this question
Under the hood, VNet peering uses the Azure backbone to route traffic between VNets with no gateway or public IP required, leveraging BGP (Border Gateway Protocol) for route exchange when using gateway transit. A subtle behavior is that 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 reach VNet C unless you configure a hub-and-spoke topology with a network virtual appliance or use Azure Route Server. In real-world scenarios, this matters for multi-tier applications where a front-end VNet must communicate with a back-end VNet without traversing the internet, achieving sub-millisecond latency.
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 Virtual Network Peering — Azure Virtual Network Peering (Option B) connects two or more Azure virtual networks (VNets) directly using the Microsoft backbone infrastructure, enabling resources in each VNet to communicate with each other as if they were on the same network. Unlike a VPN gateway, peering does not require a public internet hop or encryption overhead, and it supports transitive routing only when explicitly configured via a hub-and-spoke topology. This makes it the correct choice for low-latency, high-bandwidth cross-VNet communication.
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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