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.
Your company is designing a hybrid network architecture that connects multiple on-premises sites to Azure. You need to ensure high availability and redundancy for the connection. Which TWO solutions should you recommend? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy two ExpressRoute circuits in active-passive mode
Options A and D are correct. Active-passive ExpressRoute with redundant circuits provides high availability at the circuit level. VPNGateway active-active mode provides redundancy for VPN connections. Option B (single ExpressRoute with VPN failover) works but is less redundant than two ExpressRoute circuits. Option C (single VPN gateway) is not highly available. Option E (Azure DNS) does not affect hybrid connectivity.
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.
✓
Deploy two ExpressRoute circuits in active-passive mode
Why this is correct
Two ExpressRoute circuits provide redundancy; active-passive ensures failover.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement Azure DNS Private Resolver for resolution
Why it's wrong here
Azure DNS Private Resolver resolves names, not connectivity redundancy.
✓
Use Azure VPN Gateway in active-active mode
Why this is correct
Active-active VPNGateway provides high availability by deploying two instances.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a single VPN gateway with active-standby mode
Why it's wrong here
Single VPNgateway is a single point of failure; active-standby alone does not provide redundancy.
✗
Use a single ExpressRoute circuit with a VPN gateway as failover
Why it's wrong here
This setup provides a single ExpressRoute circuit; VPN failover is good but not as redundant as two ExpressRoute circuits.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Deploy two ExpressRoute circuits in active-passive mode — Options A and D are correct. Active-passive ExpressRoute with redundant circuits provides high availability at the circuit level. VPN Gateway active-active mode provides redundancy for VPN connections. Option B (single ExpressRoute with VPN failover) works but is less redundant than two ExpressRoute circuits. Option C (single VPN gateway) is not highly available. Option E (Azure DNS) does not affect hybrid connectivity.
What should I do if I get this AZ-305 question wrong?
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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