Question 56 of 1,031

Describe Azure architecture and services →mediumMultiple ChoiceObjective-mapped

Quick Answer

ExpressRoute is the correct choice because it provides a dedicated private connection between an on-premises network and Azure that completely bypasses the public internet, ensuring consistent low latency, higher bandwidth options up to 100 Gbps, and a financially backed SLA of at least 99.95% availability. This service is ideal for a financial trading application requiring predictable performance and security, as it avoids the variable speeds and potential congestion of internet-based VPNs. On the AZ-900 exam, this question tests your understanding of when to choose ExpressRoute over a site-to-site VPN—a common trap is assuming a VPN meets the same reliability and bandwidth guarantees. Remember that ExpressRoute is for private, dedicated, high-performance connections, while VPNs use the public internet. A useful memory tip: think of ExpressRoute as the "express lane" for your data, bypassing the public internet traffic jam.

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 financial services company runs a critical trading application in its on-premises data center. The company is migrating some workloads to Azure and requires a dedicated, private network connection between its on-premises network and Azure. The connection must not use the public internet, must provide consistent latency and higher bandwidth than a typical internet-based VPN, and must be backed by a service-level agreement (SLA) for availability. Which Azure service should the company use to meet these requirements?

Question 1mediummultiple choice

Read the full VPN explanation →

A
Azure VPN Gateway
Why wrong: Azure VPN Gateway creates an encrypted tunnel over the public internet. While it provides a secure connection, it does not offer a private connection that bypasses the public internet, and bandwidth and latency are typically lower and less consistent than ExpressRoute.
B
ExpressRoute
ExpressRoute provides a dedicated private connection from on-premises to Azure that does not use the public internet. It offers higher bandwidth, lower and consistent latency, and an availability SLA, meeting all the stated requirements.
C
Azure Firewall
Why wrong: Azure Firewall is a managed network security service that helps protect Azure virtual network resources. It does not provide a connectivity service between on-premises and Azure.
D
Azure Front Door
Why wrong: Azure Front Door is a global load balancer and content delivery network that operates over the public internet. It is designed for web applications and does not provide a private dedicated connection between an on-premises network and Azure.

Full breakdown with real-world context →

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

✓

ExpressRoute

ExpressRoute is the correct choice because it provides a dedicated, private connection between on-premises networks and Azure that bypasses the public internet entirely. This ensures consistent latency, higher bandwidth options (up to 100 Gbps), and a financially backed SLA of at least 99.95% availability, meeting all the stated requirements for a critical trading application.

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
Why it's wrong here
Azure VPN Gateway creates an encrypted tunnel over the public internet. While it provides a secure connection, it does not offer a private connection that bypasses the public internet, and bandwidth and latency are typically lower and less consistent than ExpressRoute.
✓
ExpressRoute
Why this is correct
ExpressRoute provides a dedicated private connection from on-premises to Azure that does not use the public internet. It offers higher bandwidth, lower and consistent latency, and an availability SLA, meeting all the stated requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Firewall
Why it's wrong here
Azure Firewall is a managed network security service that helps protect Azure virtual network resources. It does not provide a connectivity service between on-premises and Azure.
✗
Azure Front Door
Why it's wrong here
Azure Front Door is a global load balancer and content delivery network that operates over the public internet. It is designed for web applications and does not provide a private dedicated connection between an on-premises network and Azure.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse Azure VPN Gateway with ExpressRoute because both provide connectivity, but they fail to recognize that ExpressRoute is the only option that bypasses the public internet and offers a guaranteed SLA for availability and consistent latency.

Detailed technical explanation

How to think about this question

ExpressRoute uses Layer 3 BGP (Border Gateway Protocol) for dynamic routing between on-premises and Azure, often through a connectivity provider (e.g., Equinix, Level 3) at an Exchange or NNI point. It supports both private peering (RFC 1918 IPs) and Microsoft peering (for PaaS services), and can achieve bandwidths from 50 Mbps to 100 Gbps with a 99.95% SLA when configured with redundant circuits. In a real-world scenario, a financial trading firm would use ExpressRoute to ensure sub-millisecond latency for order execution, which is impossible over a VPN due to internet jitter.

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: ExpressRoute — ExpressRoute is the correct choice because it provides a dedicated, private connection between on-premises networks and Azure that bypasses the public internet entirely. This ensures consistent latency, higher bandwidth options (up to 100 Gbps), and a financially backed SLA of at least 99.95% availability, meeting all the stated requirements for a critical trading application.

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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