The answer is Azure ExpressRoute. This is the correct choice because it establishes a dedicated, private connection from an on-premises network directly into Azure, bypassing the public internet entirely through a Layer 3 BGP peering session over a provider-managed circuit, ensuring low latency and higher reliability. On the AZ-900 exam, this question tests your understanding of how to achieve an Azure private connection on-premises without internet, often appearing as a scenario where you need to choose between VPN Gateway and ExpressRoute. A common trap is selecting VPN Gateway, which still traverses the internet over encrypted tunnels, whereas ExpressRoute is the only service that provides a truly private, dedicated link. Remember the mnemonic "ExpressRoute Excludes the Internet" to instantly recall that this service keeps your traffic off the public web.
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.
Which Azure networking service provides a private connection from an on-premises network to Azure without using the public internet?
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 answer because it establishes a dedicated, private connection from an on-premises network directly into Azure, bypassing the public internet entirely. This is achieved through a Layer 3 BGP peering session over a provider-managed circuit, ensuring low latency, higher reliability, and data does not traverse the public internet.
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 creates encrypted tunnels over the public internet, not a dedicated private connection.
✓
Azure ExpressRoute
Why this is correct
ExpressRoute provides dedicated private connectivity from on-premises to Azure bypassing the public internet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Virtual Network
Why it's wrong here
VNet is Azure's private network within the cloud, not a connection from on-premises.
✗
Azure Bastion
Why it's wrong here
Azure Bastion provides secure browser-based RDP/SSH to VMs, not on-premises connectivity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure VPNGateway with ExpressRoute because both provide site-to-site connectivity, but VPN Gateway uses the public internet while ExpressRoute is a private, dedicated connection.
Detailed technical explanation
How to think about this question
ExpressRoute uses BGP (Border Gateway Protocol) to exchange routes between the on-premises network and Azure, supporting both active-active and active-passive configurations for redundancy. It offers three connectivity models: CloudExchange Co-location, Point-to-Point Ethernet, and Any-to-Any (IPVPN), with SLA-backed 99.95% availability. A real-world scenario is a financial institution requiring PCI-DSS compliance, where data must never traverse the public internet, making ExpressRoute mandatory.
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 answer because it establishes a dedicated, private connection from an on-premises network directly into Azure, bypassing the public internet entirely. This is achieved through a Layer 3 BGP peering session over a provider-managed circuit, ensuring low latency, higher reliability, and data does not traverse the public internet.
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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