- A
Azure VPN Gateway (site-to-site)
Why wrong: Azure VPN Gateway establishes an encrypted tunnel over the public internet. While secure, it does not bypass the internet and cannot guarantee consistent bandwidth or latency, making it unsuitable for a dedicated private connection.
- B
Azure ExpressRoute
Azure ExpressRoute extends your on-premises network into the Microsoft cloud over a private connection facilitated by a connectivity provider. The connection is dedicated, private, and does not traverse the public internet, providing high bandwidth, low latency, and guaranteed performance.
- C
Azure Virtual WAN
Why wrong: Azure Virtual WAN is a networking service that provides a unified hub-and-spoke architecture for branch connectivity. It can aggregate VPN and ExpressRoute connections, but it is not itself a dedicated private connection. It relies on underlying transport, so it does not directly satisfy the requirement for a dedicated connection that bypasses the internet.
- D
Azure Bastion
Why wrong: Azure Bastion provides secure and seamless RDP and SSH access to virtual machines directly from the Azure portal using SSL, without exposing public IP addresses. It is a management service, not a hybrid connectivity service, and does not provide a dedicated connection to on-premises.
Quick Answer
The answer is Azure ExpressRoute, as it provides a dedicated private connection to Azure without internet, ensuring high bandwidth and low latency for critical workloads. This service establishes a direct, private link between an on-premises datacenter and Azure, bypassing the public internet entirely, which guarantees consistent network performance and enhanced security for sensitive line-of-business applications. On the AZ-900 exam, this question tests your understanding of Azure networking services, often contrasting ExpressRoute with VPN Gateway—a common trap is confusing VPNs (which still traverse the internet) with ExpressRoute’s fully private path. Remember, if the scenario emphasizes “no internet,” “dedicated,” or “guaranteed performance,” ExpressRoute is the only correct choice. A helpful memory tip: think of ExpressRoute as a private highway for your data, while VPNs are like a secure tunnel on a public road.
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 an on-premises datacenter with critical line-of-business applications. They plan to migrate some workloads to Azure but need a reliable, high-bandwidth, and low-latency connection that does not traverse the public internet. The connection must be dedicated and guaranteed for a consistent network experience. Which Azure service should the company use?
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 ExpressRoute
Azure ExpressRoute provides a dedicated, private connection from on-premises to Azure that does not traverse the public internet, offering higher reliability, lower latency, and higher bandwidth than internet-based connections. This meets the requirement for a guaranteed, consistent network experience for critical line-of-business applications.
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 (site-to-site)
- ✓
Azure ExpressRoute
Why this is correct
Azure ExpressRoute extends your on-premises network into the Microsoft cloud over a private connection facilitated by a connectivity provider. The connection is dedicated, private, and does not traverse the public internet, providing high bandwidth, low latency, and guaranteed performance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Virtual WAN
Why it's wrong here
Azure Virtual WAN is a networking service that provides a unified hub-and-spoke architecture for branch connectivity. It can aggregate VPN and ExpressRoute connections, but it is not itself a dedicated private connection. It relies on underlying transport, so it does not directly satisfy the requirement for a dedicated connection that bypasses the internet.
- ✗
Azure Bastion
Why it's wrong here
Azure Bastion provides secure and seamless RDP and SSH access to virtual machines directly from the Azure portal using SSL, without exposing public IP addresses. It is a management service, not a hybrid connectivity service, and does not provide a dedicated connection to on-premises.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Azure VPN Gateway's site-to-site VPN (which is also dedicated but still traverses the public internet) with ExpressRoute's truly private, internet-free connection, leading candidates to choose VPN when the question explicitly requires 'does not traverse the public internet'.
Detailed technical explanation
How to think about this question
ExpressRoute uses BGP (Border Gateway Protocol) for dynamic routing between on-premises and Azure, and supports private peering (RFC 1918 IPs) and Microsoft peering (for Azure PaaS services). It offers Service Level Agreements (SLAs) of 99.95% availability for dedicated circuits, with bandwidth options from 50 Mbps to 100 Gbps, and can be implemented via direct fiber, MPLS VPNs, or colocation providers.
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.
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 ExpressRoute — Azure ExpressRoute provides a dedicated, private connection from on-premises to Azure that does not traverse the public internet, offering higher reliability, lower latency, and higher bandwidth than internet-based connections. This meets the requirement for a guaranteed, consistent network experience for critical line-of-business applications.
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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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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