- A
Azure ExpressRoute
Correct. ExpressRoute provides a dedicated private circuit from an on-premises network to Azure, bypassing the public internet for improved latency, security, and reliability. It supports high bandwidth (up to 10 Gbps) and offers a financially backed SLA (e.g., 99.95% availability for a single connection).
- B
Azure VPN Gateway (site-to-site)
Why wrong: Incorrect. A site-to-site VPN over the public internet does not provide a dedicated private path. It cannot guarantee consistent latency, offers lower maximum bandwidth (typically up to 1.25 Gbps), and has no SLA for throughput or latency.
- C
Azure Front Door
Why wrong: Incorrect. Azure Front Door is a global application delivery network that routes HTTP/HTTPS traffic over the public internet to optimize web application performance. It is not a private connectivity service for hybrid cloud connectivity.
- D
Azure Bastion
Why wrong: Incorrect. Azure Bastion provides secure browser-based RDP and SSH access to Azure VMs from the Azure portal. It does not create a private connection between on-premises and Azure; it is a management service that operates within 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.
A company runs a critical ERP system on-premises and plans to extend the application to Azure IaaS VMs for burst capacity. The network team requires a dedicated, private connection between the on-premises data center and Azure that does not traverse the public internet. The connection must offer consistent latency, high bandwidth options up to 10 Gbps, and a financially backed SLA for availability. Which Azure service should the team provision to meet these requirements?
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 bypasses the public internet, ensuring consistent latency and high bandwidth up to 10 Gbps. It also offers a financially backed SLA for availability, making it the ideal choice for extending a critical ERP system for burst capacity with predictable performance.
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 this is correct
Correct. ExpressRoute provides a dedicated private circuit from an on-premises network to Azure, bypassing the public internet for improved latency, security, and reliability. It supports high bandwidth (up to 10 Gbps) and offers a financially backed SLA (e.g., 99.95% availability for a single connection).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure VPN Gateway (site-to-site)
Why it's wrong here
Incorrect. A site-to-site VPN over the public internet does not provide a dedicated private path. It cannot guarantee consistent latency, offers lower maximum bandwidth (typically up to 1.25 Gbps), and has no SLA for throughput or latency.
- ✗
Azure Front Door
Why it's wrong here
Incorrect. Azure Front Door is a global application delivery network that routes HTTP/HTTPS traffic over the public internet to optimize web application performance. It is not a private connectivity service for hybrid cloud connectivity.
- ✗
Azure Bastion
Why it's wrong here
Incorrect. Azure Bastion provides secure browser-based RDP and SSH access to Azure VMs from the Azure portal. It does not create a private connection between on-premises and Azure; it is a management service that operates within Azure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the misconception that a site-to-site VPN can provide dedicated, private connectivity with guaranteed performance, but the key differentiator is that ExpressRoute bypasses the public internet entirely and offers a financially backed SLA.
Detailed technical explanation
How to think about this question
ExpressRoute connections are established through MPLS-based circuits from connectivity providers, bypassing the internet entirely, which eliminates packet loss and jitter common in VPNs. The service supports bandwidths from 50 Mbps to 10 Gbps (and up to 100 Gbps with ExpressRoute Direct), and the SLA guarantees 99.95% availability for dedicated circuits. In real-world scenarios, enterprises use ExpressRoute for hybrid cloud deployments where latency-sensitive workloads like ERP or SAP must maintain consistent performance during burst scaling.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 bypasses the public internet, ensuring consistent latency and high bandwidth up to 10 Gbps. It also offers a financially backed SLA for availability, making it the ideal choice for extending a critical ERP system for burst capacity with predictable performance.
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.
About these practice questions
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Last reviewed: Jun 30, 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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