The answer is to create an Azure DNS private zone and add an A record for the VM, paired with assigning a static private IP address. A static private IP ensures the VM retains its fixed address after any reboot or shutdown, which is critical for legacy applications that rely on Windows authentication and a hardcoded IP. The Azure DNS private zone then provides custom hostname resolution within the virtual network, allowing on-premises users to reach the VM by its hostname without needing a public IP. On the AZ-305 exam, this scenario tests your understanding of hybrid networking and name resolution for legacy workloads, often appearing as a trap where candidates mistakenly choose a public IP or Azure Bastion. Remember, internal access does not require public exposure, and Bastion is for secure management, not DNS. A useful memory tip: “Static IP locks the address, private DNS maps the name—no public IP needed for internal fame.”
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 organization is migrating a legacy application to Azure that requires Windows authentication and a fixed IP address. The application will run on an Azure VM. You need to design a networking solution that ensures the VM retains its IP address even after a reboot and that the application can be reached by on-premises users using its hostname. Which TWO actions should you take? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign a static private IP address to the VM's NIC
Options A and D are correct. A static private IP ensures the IP does not change after reboot. Azure DNS private zone allows custom DNS resolution for the hostname. Option B (public IP) is not required for internal access. Option C (Azure Bastion) is for management access, not name resolution. Option E (Azure Firewall) is not needed for this scenario.
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.
✓
Assign a static private IP address to the VM's NIC
Why this is correct
Static private IP persists across reboots and ensures the application has a fixed IP.
Related concept
Read the scenario before looking for a memorised answer.
✗
Assign a static public IP address to the VM
Why it's wrong here
A public IP is not required for on-premises users to access via VPN/ExpressRoute; they use private addresses.
✗
Configure Azure Firewall to forward DNS requests
Why it's wrong here
Azure FirewallDNS proxy is not needed; the DNS private zone handles resolution.
✓
Create an Azure DNS private zone and add an A record for the VM
Why this is correct
Azure DNS private zone allows on-premises users to resolve the VM hostname via DNS.
Related concept
Read the scenario before looking for a memorised answer.
✗
Connect to the VM using Azure Bastion for name resolution
Why it's wrong here
Azure Bastion provides secure RDP/SSH, not DNS resolution.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Assign a static private IP address to the VM's NIC — Options A and D are correct. A static private IP ensures the IP does not change after reboot. Azure DNS private zone allows custom DNS resolution for the hostname. Option B (public IP) is not required for internal access. Option C (Azure Bastion) is for management access, not name resolution. Option E (Azure Firewall) is not needed for this scenario.
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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