The answer is Azure ExpressRoute with two circuits. This is correct because ExpressRoute establishes a dedicated, private connection from on-premises to Azure that bypasses the public internet entirely, and configuring two separate circuits—each terminating on different Microsoft Enterprise Edge (MSEE) devices—provides active-active high availability by eliminating any single point of failure at the physical and network layers. On the AZ-900 exam, this scenario tests your understanding of ExpressRoute’s core value proposition: a private, reliable link that is not dependent on internet connectivity, and the requirement for redundancy through multiple circuits rather than a single circuit with redundant paths. A common trap is assuming a single ExpressRoute circuit with two connections is sufficient, but the exam emphasizes that true high availability demands two physically distinct circuits. Memory tip: think “two circuits, two edges” to recall that each circuit must connect to a different MSEE device for full redundancy.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 wants to connect their on-premises data center to Azure with a dedicated, private connection that does not traverse the internet. They also need to ensure high availability by having two active connections. Which Azure service and configuration should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure ExpressRoute with two circuits.
Azure ExpressRoute provides a dedicated, private connection from on-premises to Azure that does not traverse the public internet. To achieve high availability with two active connections, you must configure two ExpressRoute circuits, each connecting to different Microsoft Enterprise Edge (MSEE) devices, ensuring redundancy at the physical and network layer.
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 with active-active mode.
Why it's wrong here
VPNGateway uses the internet, not a dedicated private connection.
✓
Azure ExpressRoute with two circuits.
Why this is correct
ExpressRoute circuits provide private connections; using two circuits ensures high availability.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Virtual WAN with a single connection.
Why it's wrong here
Virtual WAN can aggregate connections, but a single connection is not highly available.
✗
Azure Point-to-Site VPN.
Why it's wrong here
Point-to-Site is for individual client connections, not site-to-site.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'active-active mode' on VPNGateway with a dedicated private connection, not realizing that VPN Gateway still uses the internet, while ExpressRoute is the only service that offers a private, internet-free connection with dual-circuit high availability.
Detailed technical explanation
How to think about this question
ExpressRoute circuits are provisioned at Layer 3 using BGP for dynamic routing, and each circuit connects to two MSEE routers for redundancy. For true active-active high availability, two separate circuits (each with its own BGP session) are required, as a single circuit with dual connections still shares the same physical circuit path. This design meets the 99.95% SLA for ExpressRoute when both circuits are active.
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.
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 ExpressRoute with two circuits. — Azure ExpressRoute provides a dedicated, private connection from on-premises to Azure that does not traverse the public internet. To achieve high availability with two active connections, you must configure two ExpressRoute circuits, each connecting to different Microsoft Enterprise Edge (MSEE) devices, ensuring redundancy at the physical and network layer.
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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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to connect an on-premises network to Azure with a dedicated private connection that bypasses the internet. Which service should they use?
medium
A.Azure VPN Gateway
✓ B.Azure ExpressRoute
C.Azure Virtual WAN
D.Azure DNS
Why B: Azure ExpressRoute is the correct service because it provides a dedicated, private connection from an on-premises network directly into Azure, bypassing the public internet entirely. This ensures lower latency, higher reliability, and greater security compared to internet-based connections, and it supports higher bandwidth options.
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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.
Question Discussion
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