- A
Azure VPN Gateway
Why wrong: Azure VPN Gateway connects on-premises networks to Azure over the internet or via ExpressRoute, and can also connect VNets, but it sends traffic over the public internet (unless using ExpressRoute) and typically introduces higher latency compared to VNet peering. It also requires a gateway subnet and incurs hourly costs. For direct VNet-to-VNet private connectivity across regions, VNet peering is a better choice.
- B
VNet Peering
VNet peering (including global VNet peering) allows direct private IP connectivity between two VNets, regardless of region. Traffic remains on the Microsoft backbone, ensuring low latency and no exposure to the public internet. This solution is simple to configure, does not require gateways, and supports cross-region communication. It perfectly meets the requirements.
- C
Azure ExpressRoute
Why wrong: Azure ExpressRoute provides a dedicated private connection from an on-premises network to Azure, not between two Azure VNets. While it offers low latency and private connectivity, it is designed for hybrid scenarios and is not intended for VNet-to-VNet connections. It is also costly and requires third-party providers. It does not address the requirement to connect VNets across regions.
- D
Azure Virtual WAN
Why wrong: Azure Virtual WAN is a hub-and-spoke networking service that connects branches, sites, and VNets primarily through VPN or ExpressRoute gateways. While it can connect multiple VNets, it does so via a virtual hub that uses gateways, which adds complexity and cost compared to direct VNet peering. For a simple direct connection between two VNets, VNet peering is the appropriate service.
Quick Answer
The answer is VNet Peering, which enables direct private IP connectivity between two Azure virtual networks using the Microsoft backbone network, ensuring all traffic stays within Azure and never traverses the public internet. This service provides low-latency, high-bandwidth cross-region communication without needing a VPN gateway or dedicated circuit, making it ideal for connecting VNets in East US and West Europe as described. On the AZ-900 exam, this scenario tests your understanding of cloud-to-cloud connectivity options, often contrasting VNet Peering with VPN Gateway or ExpressRoute—a common trap is choosing a gateway when no on-premises connection is required. Remember that VNet Peering is the simplest and most cost-effective solution for private, cross-region VNet links, and it supports transitive routing only if explicitly configured via a hub. A helpful memory tip: “Peering is private, no gateway needed—just peer and steer.”
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 deployed applications in two separate Azure virtual networks (VNets) in the East US and West Europe regions. Each VNet contains multiple subnets with application servers and databases. The network team needs to enable direct, private IP connectivity between the VNets, ensuring that all traffic stays within the Azure backbone network and never traverses the public internet. The solution must also provide low latency for cross-region communication. They currently do not need a dedicated private connection to an on-premises datacenter. Which Azure service should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
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
VNet Peering
VNet Peering is the correct choice because it enables direct, private IP connectivity between two Azure virtual networks using the Microsoft backbone infrastructure, ensuring traffic never traverses the public internet. It provides low-latency, high-bandwidth cross-region communication without requiring a VPN gateway or dedicated circuits. Since the scenario involves only cloud-to-cloud connectivity (no on-premises requirement), VNet Peering is the simplest and most cost-effective solution.
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
Azure VPN Gateway connects on-premises networks to Azure over the internet or via ExpressRoute, and can also connect VNets, but it sends traffic over the public internet (unless using ExpressRoute) and typically introduces higher latency compared to VNet peering. It also requires a gateway subnet and incurs hourly costs. For direct VNet-to-VNet private connectivity across regions, VNet peering is a better choice.
- ✓
VNet Peering
Why this is correct
VNet peering (including global VNet peering) allows direct private IP connectivity between two VNets, regardless of region. Traffic remains on the Microsoft backbone, ensuring low latency and no exposure to the public internet. This solution is simple to configure, does not require gateways, and supports cross-region communication. It perfectly meets the requirements.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure ExpressRoute
Why it's wrong here
Azure ExpressRoute provides a dedicated private connection from an on-premises network to Azure, not between two Azure VNets. While it offers low latency and private connectivity, it is designed for hybrid scenarios and is not intended for VNet-to-VNet connections. It is also costly and requires third-party providers. It does not address the requirement to connect VNets across regions.
- ✗
Azure Virtual WAN
Why it's wrong here
Azure Virtual WAN is a hub-and-spoke networking service that connects branches, sites, and VNets primarily through VPN or ExpressRoute gateways. While it can connect multiple VNets, it does so via a virtual hub that uses gateways, which adds complexity and cost compared to direct VNet peering. For a simple direct connection between two VNets, VNet peering is the appropriate service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure VPN Gateway with VNet Peering, assuming a VPN is required for cross-region connectivity, but VNet Peering natively supports global peering without any gateway or public internet exposure.
Trap categories for this question
Scenario analysis trap
Azure ExpressRoute provides a dedicated private connection from an on-premises network to Azure, not between two Azure VNets. While it offers low latency and private connectivity, it is designed for hybrid scenarios and is not intended for VNet-to-VNet connections. It is also costly and requires third-party providers. It does not address the requirement to connect VNets across regions.
Detailed technical explanation
How to think about this question
VNet Peering uses the Azure backbone to route traffic between VNets with RFC 1918 private IP addresses, leveraging the underlying Azure SDN fabric for near line-rate throughput and sub-millisecond latency within a region. Cross-region peering (global VNet Peering) is supported and uses the same backbone, but traffic incurs standard egress charges. A subtle behavior is that peered VNets must have non-overlapping address spaces, and transitive routing is not supported—each peering is a direct, non-transitive relationship.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-900 question test?
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: VNet Peering — VNet Peering is the correct choice because it enables direct, private IP connectivity between two Azure virtual networks using the Microsoft backbone infrastructure, ensuring traffic never traverses the public internet. It provides low-latency, high-bandwidth cross-region communication without requiring a VPN gateway or dedicated circuits. Since the scenario involves only cloud-to-cloud connectivity (no on-premises requirement), VNet Peering is the simplest and most cost-effective solution.
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.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-900 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-900 exam.
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