The answer is Azure DNS Private Resolver because it provides seamless hybrid DNS resolution between on-premises and Azure environments without requiring you to deploy or manage additional DNS infrastructure. This service acts as a bidirectional forwarding proxy, enabling Azure resources to resolve on-premises hostnames and on-premises clients to resolve Azure private DNS zones, all while minimizing administrative overhead by eliminating the need for custom DNS servers or complex forwarding rules. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this scenario tests your understanding of how to integrate network services in a hybrid topology, often appearing as a distractor against options like Azure Firewall DNS proxy or public Azure DNS—common traps that either require manual rule maintenance or cannot resolve private hostnames. The key insight is that Azure DNS Private Resolver is purpose-built for this exact use case, handling conditional forwarding automatically across ExpressRoute connections. Memory tip: think of it as a “private bridge” that connects your on-premises and Azure DNS namespaces without extra servers.
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 has a hybrid network with multiple on-premises sites connected to Azure via ExpressRoute. You need to design a DNS resolution strategy that allows Azure resources to resolve on-premises hostnames and on-premises clients to resolve Azure hostnames. The solution must minimize administrative overhead. What should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure DNS Private Resolver
Option B is correct because Azure DNS Private Resolver can resolve between on-premises and Azure DNS zones without additional DNS servers. Option A is wrong because Azure DNS (public) does not resolve private hostnames. Option C is wrong because Azure Firewall DNS proxy requires manual forwarding rules. Option D is wrong because Azure Bastion is not a DNS resolution service.
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
Azure Bastion is for secure RDP/SSH access, not DNS resolution.
✗
Azure DNS public zones with conditional forwarding
Why it's wrong here
Public zones resolve public names, not private hostnames; conditional forwarding requires additional DNS servers.
✓
Azure DNS Private Resolver
Why this is correct
Azure DNS Private Resolver provides bidirectional DNS resolution between on-premises and Azure private DNS zones with minimal overhead.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Firewall DNS proxy
Why it's wrong here
DNS proxy forwards requests but does not resolve private zones; requires manual configuration.
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
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.
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: Azure DNS Private Resolver — Option B is correct because Azure DNS Private Resolver can resolve between on-premises and Azure DNS zones without additional DNS servers. Option A is wrong because Azure DNS (public) does not resolve private hostnames. Option C is wrong because Azure Firewall DNS proxy requires manual forwarding rules. Option D is wrong because Azure Bastion is not a DNS resolution service.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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