- A
Azure Virtual Network Peering
Correct. Global VNet Peering connects VNets across Azure regions using Microsoft's backbone network, providing private, low-latency connectivity with minimal complexity and no additional gateway costs beyond standard data transfer charges.
- B
Azure VPN Gateway (Site-to-Site)
Why wrong: Incorrect. While a VPN Gateway can connect VNets, it requires a gateway on each VNet and incurs hourly gateway costs plus data transfer charges. It is more complex than VNet Peering and introduces higher latency due to encryption overhead.
- C
Azure ExpressRoute
Why wrong: Incorrect. ExpressRoute is designed for private connections between on-premises networks and Azure, not for directly connecting two Azure virtual networks. It would require additional routing configuration and extra costs.
- D
Azure Front Door
Why wrong: Incorrect. Azure Front Door is a global HTTP/S load balancing and application acceleration service that operates at the application layer (Layer 7). It does not provide private network connectivity between virtual networks.
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.
A company has two Azure virtual networks: VNet-A in the East US region and VNet-B in the West US region. Each VNet hosts a set of virtual machines that run a distributed application. The application requires private, low-latency communication between the VMs in VNet-A and VNet-B. The company wants to minimize operational complexity and avoid any additional billing for data transfer between the two VNets beyond the standard Azure data transfer charges. Which Azure service should the company use to connect the two virtual networks?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Azure Virtual Network Peering
Azure Virtual Network Peering is the correct choice because it connects two virtual networks directly over the Microsoft backbone network, providing private, low-latency communication between VMs in different regions. It incurs only standard Azure data transfer charges (no additional gateway or circuit costs) and requires minimal operational overhead, as it is a simple configuration with no extra devices or bandwidth provisioning.
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 Virtual Network Peering
Why this is correct
Correct. Global VNet Peering connects VNets across Azure regions using Microsoft's backbone network, providing private, low-latency connectivity with minimal complexity and no additional gateway costs beyond standard data transfer charges.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure VPN Gateway (Site-to-Site)
- ✗
Azure ExpressRoute
Why it's wrong here
Incorrect. ExpressRoute is designed for private connections between on-premises networks and Azure, not for directly connecting two Azure virtual networks. It would require additional routing configuration and extra costs.
- ✗
Azure Front Door
Why it's wrong here
Incorrect. Azure Front Door is a global HTTP/S load balancing and application acceleration service that operates at the application layer (Layer 7). It does not provide private network connectivity between virtual networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VNet Peering with VPN Gateway, assuming a VPN is required for cross-region connectivity, but VNet Peering is the simpler, lower-cost option for private Azure-to-Azure communication without additional gateway billing.
Detailed technical explanation
How to think about this question
VNet Peering uses the Azure backbone to route traffic between VNets with no intermediate hops, achieving latency equivalent to a single VNet. When peering across regions (global peering), traffic stays on Microsoft's network and is subject to standard egress charges per GB, but no gateway or circuit fees. A subtle behavior is that peered VNets must have non-overlapping address spaces, and you can optionally configure gateway transit to use a VPN gateway in one VNet for connectivity to on-premises.
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: Azure Virtual Network Peering — Azure Virtual Network Peering is the correct choice because it connects two virtual networks directly over the Microsoft backbone network, providing private, low-latency communication between VMs in different regions. It incurs only standard Azure data transfer charges (no additional gateway or circuit costs) and requires minimal operational overhead, as it is a simple configuration with no extra devices or bandwidth provisioning.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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