- A
ExpressRoute as the primary connection and a Site-to-Site VPN as the backup connection.
ExpressRoute provides a private, dedicated circuit with high bandwidth and low latency. A Site-to-Site VPN over the internet is a cost-effective backup that can be activated if ExpressRoute fails.
- B
Two ExpressRoute circuits from different service providers, both active.
Why wrong: While this provides high availability, it is not a 'lower-cost' backup. Both circuits are premium and typically have similar costs.
- C
Site-to-Site VPN as the primary connection and Point-to-Site VPN as the backup.
Why wrong: Point-to-Site VPN is client-to-Azure, not site-to-site. It would not connect the entire on-premises data center. Also, Site-to-Site VPN does not meet the requirement for high bandwidth and private connectivity.
- D
Azure VPN Gateway with active-passive mode and a second VPN Gateway for failover.
Why wrong: A single VPN Gateway with active-passive mode provides redundancy within Azure, but it still uses the public internet and does not meet the 'private, dedicated' requirement.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 has an on-premises data center and wants to connect it to Azure to extend their network. They require a dedicated, private, high-bandwidth connection that is not routed over the public internet. They also want a lower-cost backup connection for redundancy in case the primary connection fails. Which combination of connectivity options should they implement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ExpressRoute as the primary connection and a Site-to-Site VPN as the backup connection.
ExpressRoute provides a dedicated, private, high-bandwidth connection that bypasses the public internet, meeting the primary requirement. A Site-to-Site VPN over the internet serves as a cost-effective backup path for redundancy, as it uses encrypted tunnels over the public internet without the recurring costs of a second ExpressRoute circuit.
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.
- ✓
ExpressRoute as the primary connection and a Site-to-Site VPN as the backup connection.
Why this is correct
ExpressRoute provides a private, dedicated circuit with high bandwidth and low latency. A Site-to-Site VPN over the internet is a cost-effective backup that can be activated if ExpressRoute fails.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Two ExpressRoute circuits from different service providers, both active.
Why it's wrong here
While this provides high availability, it is not a 'lower-cost' backup. Both circuits are premium and typically have similar costs.
- ✗
Site-to-Site VPN as the primary connection and Point-to-Site VPN as the backup.
Why it's wrong here
Point-to-Site VPN is client-to-Azure, not site-to-site. It would not connect the entire on-premises data center. Also, Site-to-Site VPN does not meet the requirement for high bandwidth and private connectivity.
- ✗
Azure VPN Gateway with active-passive mode and a second VPN Gateway for failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume two ExpressRoute circuits are required for redundancy, overlooking the cost-effective alternative of using a Site-to-Site VPN as a backup, which still meets the redundancy requirement without the high cost of a second private connection.
Trap categories for this question
Similar concept trap
While this provides high availability, it is not a 'lower-cost' backup. Both circuits are premium and typically have similar costs.
Detailed technical explanation
How to think about this question
ExpressRoute uses BGP for dynamic routing and offers SLA-backed 99.95% uptime, while Site-to-Site VPN relies on IPsec/IKE tunnels over the internet with a maximum throughput of 1.25 Gbps per tunnel (VPN Gateway VpnGw3). In a real-world scenario, the backup VPN can be configured with a lower bandwidth SKU to reduce costs, and automatic failover can be achieved using BGP route advertisement or Azure Traffic Manager.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-305 question test?
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 as the primary connection and a Site-to-Site VPN as the backup connection. — ExpressRoute provides a dedicated, private, high-bandwidth connection that bypasses the public internet, meeting the primary requirement. A Site-to-Site VPN over the internet serves as a cost-effective backup path for redundancy, as it uses encrypted tunnels over the public internet without the recurring costs of a second ExpressRoute circuit.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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Last reviewed: Jun 11, 2026
This AZ-305 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-305 exam.
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