AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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.
An on-premises datacenter must connect privately to Azure with predictable bandwidth and avoid traversal of the public internet. Which connectivity option should be recommended?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ExpressRoute
ExpressRoute provides a dedicated private connection from on-premises to Azure, bypassing the public internet entirely. It offers predictable bandwidth, low latency, and high reliability through a Layer 3 MPLS or direct fiber link from a connectivity provider. This meets the requirement for a private, consistent network path without internet traversal.
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 Bastion
Why it's wrong here
Bastion provides browser-based VM administration, not datacenter connectivity.
✗
Point-to-site VPN
Why it's wrong here
Point-to-site VPN is for individual client access, not datacenter private connectivity.
✗
Site-to-site VPN only
Why it's wrong here
VPN uses encrypted tunnels over the public internet and does not provide the same private dedicated path.
✓
ExpressRoute
Why this is correct
ExpressRoute provides private dedicated connectivity to Microsoft cloud services through a connectivity provider.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Site-to-site VPN (which also provides a private IP tunnel) as meeting the 'private' requirement, but it still traverses the public internet and cannot guarantee predictable bandwidth like ExpressRoute.
Detailed technical explanation
How to think about this question
ExpressRoute operates at Layer 3 using BGP (RFC 4271) for dynamic routing between on-premises and Azure, with SLA-backed 99.95% availability for dedicated circuits. It supports both private peering (RFC 1918 IPs) and Microsoft peering (PaaS services), and can be configured with ExpressRoute Global Reach to connect multiple on-premises sites. In real-world scenarios, organizations with latency-sensitive workloads like SAP HANA or real-time analytics rely on ExpressRoute to avoid jitter and packet loss inherent in internet-based VPNs.
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-305 question in full detail.
Design infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ExpressRoute — ExpressRoute provides a dedicated private connection from on-premises to Azure, bypassing the public internet entirely. It offers predictable bandwidth, low latency, and high reliability through a Layer 3 MPLS or direct fiber link from a connectivity provider. This meets the requirement for a private, consistent network path without internet traversal.
What should I do if I get this AZ-305 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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