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.
A company needs to connect its on-premises data center to Azure for hybrid workloads. The connection must be private, dedicated, and provide guaranteed bandwidth. Which Azure service should they use?
Why wrong: Incorrect. Azure VPN Gateway uses the public internet and does not provide a dedicated, private connection with guaranteed bandwidth.
B
Azure ExpressRoute
Correct. ExpressRoute offers a dedicated, private connection with bandwidth guarantees and higher reliability than VPN.
C
Azure Virtual WAN
Why wrong: Incorrect. Azure Virtual WAN is a networking topology that can integrate multiple connection types but is not a connection service itself.
D
Azure Peering Service
Why wrong: Incorrect. Azure Peering Service is for improving connectivity to Microsoft cloud services from on-premises, not for dedicated private connections.
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 provides a private, dedicated connection from on-premises to Azure, bypassing the public internet. It offers guaranteed bandwidth, higher reliability, and lower latency compared to VPN-based solutions, making it ideal for hybrid workloads requiring consistent performance.
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
Incorrect. Azure VPNGateway uses the public internet and does not provide a dedicated, private connection with guaranteed bandwidth.
✓
Azure ExpressRoute
Why this is correct
Correct. ExpressRoute offers a dedicated, private connection with bandwidth guarantees and higher reliability than VPN.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Virtual WAN
Why it's wrong here
Incorrect. Azure Virtual WAN is a networking topology that can integrate multiple connection types but is not a connection service itself.
✗
Azure Peering Service
Why it's wrong here
Incorrect. Azure Peering Service is for improving connectivity to Microsoft cloud services from on-premises, not for dedicated private connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure VPNGateway's 'dedicated tunnel' concept with true dedicated bandwidth, overlooking that VPNs still traverse the public internet and cannot guarantee performance, while ExpressRoute provides a physically isolated connection with contractual bandwidth guarantees.
Detailed technical explanation
How to think about this question
ExpressRoute uses BGP (Border Gateway Protocol) for dynamic routing between on-premises and Azure, supporting both active-active and active-passive configurations. It offers Service Level Agreements (SLAs) of 99.95% uptime for dedicated circuits and supports bandwidths from 50 Mbps to 100 Gbps. In a real-world scenario, a financial institution requiring low-latency, high-throughput data replication would use ExpressRoute to avoid internet congestion and meet compliance requirements.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Azure ExpressRoute — Azure ExpressRoute provides a private, dedicated connection from on-premises to Azure, bypassing the public internet. It offers guaranteed bandwidth, higher reliability, and lower latency compared to VPN-based solutions, making it ideal for hybrid workloads requiring consistent performance.
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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