The answer is Azure VPN Gateway. This service is the correct choice because it acts as a cloud-based VPN endpoint that establishes secure, encrypted site-to-site connectivity between an on-premises network and Azure virtual networks over the public internet using IPsec/IKE protocols. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of hybrid networking services, often appearing alongside scenarios that contrast site-to-site with point-to-site or ExpressRoute connections. A common trap is confusing Azure VPN Gateway with Azure Virtual WAN or Azure Bastion, but remember that only VPN Gateway terminates IPsec tunnels from on-premises devices for site-to-site VPN. For a quick memory tip, think "VPN Gateway = the cloud-side router for your on-premises tunnel," linking the word "gateway" directly to the gateway between your local network and Azure.
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.
Which Azure service acts as a cloud-based VPN gateway that enables secure site-to-site connectivity between an on-premises network and Azure virtual networks?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure VPN Gateway
Azure VPNGateway is the correct service because it is specifically designed to establish secure, encrypted site-to-site connectivity between an on-premises network and Azure virtual networks over the public internet using IPsec/IKE protocols. It acts as a cloud-based VPN endpoint that terminates VPN tunnels from on-premises VPN devices, enabling hybrid connectivity.
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 ExpressRoute
Why it's wrong here
ExpressRoute provides private dedicated connectivity, not VPN-based encrypted tunnels.
Read the scenario before looking for a memorised answer.
✗
Azure Front Door
Why it's wrong here
Front Door is a global CDN and load balancer for web traffic, not site-to-site VPN connectivity.
✗
Azure Firewall
Why it's wrong here
Azure Firewall is a managed network security service, not a VPNgateway for site-to-site connectivity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure VPNGateway with Azure ExpressRoute, mistakenly thinking ExpressRoute is a VPN service, when in fact ExpressRoute is a dedicated private connection that bypasses the internet entirely and does not use IPsec encryption.
Detailed technical explanation
How to think about this question
Azure VPNGateway supports both policy-based (static routing) and route-based (dynamic routing using BGP) VPN configurations, with the latter being the recommended approach for most scenarios. Under the hood, it uses IKEv1 or IKEv2 for key exchange and can support up to 30 tunnels per gateway instance, with throughput ranging from 100 Mbps to 10 Gbps depending on the SKU. A real-world scenario where this matters is when an organization needs to connect multiple branch offices to Azure using S2S VPNs while maintaining BGP route propagation for dynamic failover.
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 VPN Gateway — Azure VPN Gateway is the correct service because it is specifically designed to establish secure, encrypted site-to-site connectivity between an on-premises network and Azure virtual networks over the public internet using IPsec/IKE protocols. It acts as a cloud-based VPN endpoint that terminates VPN tunnels from on-premises VPN devices, enabling hybrid connectivity.
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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