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 wants to connect an on-premises network to Azure with a dedicated private connection that bypasses the internet. Which service 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
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.
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
VPNGateway uses encrypted tunnels over the internet, not a dedicated private connection.
✓
Azure ExpressRoute
Why this is correct
Correct. ExpressRoute is a private dedicated connection that does not go over the internet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Virtual WAN
Why it's wrong here
Virtual WAN is a networking service that can incorporate VPN and ExpressRoute but is not itself a dedicated connection.
✗
Azure DNS
Why it's wrong here
Azure DNS is a domain name resolution service, not a connectivity service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure VPNGateway (which also connects on-premises to Azure) with a private connection, but VPN Gateway still uses the public internet as the underlying transport, whereas ExpressRoute is the only option that completely bypasses the internet.
Detailed technical explanation
How to think about this question
ExpressRoute uses Layer 3 BGP peering over a provider-managed MPLS or Ethernet connection, allowing private IP traffic to flow without traversing the internet. It supports dynamic routing via BGP, enabling automatic failover and load balancing across multiple circuits. In a real-world scenario, a financial institution requiring low-latency, high-bandwidth, and regulatory compliance would choose ExpressRoute over VPN to avoid internet-based risks and meet strict SLAs.
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 ExpressRoute — 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.
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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