Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
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Azure VPN Gateway
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
Best answer
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
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Azure ExpressRoute
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
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Azure Virtual WAN
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 trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?
Question 2
A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)
Question 3
A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?
Question 4
A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?
Question 5
A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?
Question 6
A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?
FAQ
Questions learners often ask
What does this AZ-900 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: VNet Peering — Global VNet peering connects two Azure VNets across regions using private IP addresses. Traffic between peered VNets stays on the Microsoft backbone network, never traversing the public internet, and offers low latency because it uses direct private routing. This is the simplest and most cost-effective solution for connecting VNets across regions when no on-premises connectivity is required.
What should I do if I get this AZ-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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