- A
Add an NSG rule allowing UDP and TCP port 53 between the VNets.
Why wrong: Port 53 may be required for DNS traffic, but it does not tell the spoke where to send queries.
- B
Set the spoke VNet's custom DNS server to 10.50.1.4.
The spoke VNet must be told to use the DNS server that contains the internal zone records. By configuring 10.50.1.4 as the custom DNS server for the spoke VNet, new and existing VMs in that VNet can query the hub-based resolver for names such as app01.corp.local. Peering alone does not change DNS behavior, so the DNS server setting is the missing configuration.
- C
Create a private endpoint for the hub DNS server.
Why wrong: Private endpoints are for Azure PaaS services, not for exposing a standard DNS server as a private service.
- D
Enable remote gateways on the spoke peering.
Why wrong: Remote gateways are for routing through an existing gateway, not for name resolution between VNets.
Quick Answer
The answer is to set the spoke VNet’s custom DNS server to 10.50.1.4. This is correct because Azure VNets use a built-in internal DNS by default, which cannot resolve custom private domains like corp.local. By configuring a custom DNS server at the VNet level, you override that default for all VMs in the spoke, directing their name resolution queries to the hub’s DNS server at 10.50.1.4. On the AZ-104 exam, this scenario tests your understanding that VNet peering provides IP connectivity but does not automatically share DNS resolution—a common trap is thinking you need to modify NSGs or peering settings instead. Remember, DNS is a VNet-level setting, not a peering property. A helpful memory tip: “Peering for IP, custom DNS for names”—the spoke VNet must point to the hub’s DNS server to resolve internal hostnames like app01.corp.local.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. 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 spoke VM can connect to a hub VM by IP address after peering is configured, but it cannot resolve internal host names such as app01.corp.local. The hub has a DNS server at 10.50.1.4 that hosts those records. What should the administrator configure so the spoke VMs use that DNS server?
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
Set the spoke VNet's custom DNS server to 10.50.1.4.
Option B is correct because the spoke VNet must be configured to use a custom DNS server to override Azure's default internal name resolution. By setting the spoke VNet's DNS server to 10.50.1.4, all VMs in the spoke will query that server for hostname resolution, including app01.corp.local. This is a VNet-level setting that applies to all VMs in the spoke, and it does not require any changes to NSGs or peering configurations.
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.
- ✗
Add an NSG rule allowing UDP and TCP port 53 between the VNets.
Why it's wrong here
Port 53 may be required for DNS traffic, but it does not tell the spoke where to send queries.
- ✓
Set the spoke VNet's custom DNS server to 10.50.1.4.
Why this is correct
The spoke VNet must be told to use the DNS server that contains the internal zone records. By configuring 10.50.1.4 as the custom DNS server for the spoke VNet, new and existing VMs in that VNet can query the hub-based resolver for names such as app01.corp.local. Peering alone does not change DNS behavior, so the DNS server setting is the missing configuration.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a private endpoint for the hub DNS server.
- ✗
Enable remote gateways on the spoke peering.
Why it's wrong here
Remote gateways are for routing through an existing gateway, not for name resolution between VNets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VNet peering with DNS resolution, assuming that peering automatically enables name resolution across VNets, when in fact you must explicitly configure a custom DNS server or use Azure Private DNS Zones to resolve private hostnames.
Detailed technical explanation
How to think about this question
When you set a custom DNS server on a VNet, Azure updates the DHCP lease for all VMs in that VNet to include the custom DNS server's IP address as the primary DNS resolver. This is done at the Azure platform level, and VMs must reboot or renew their DHCP lease to pick up the change. In a hub-and-spoke topology, the hub DNS server (e.g., a Windows Server with AD DS) typically hosts internal zones like corp.local, and the spoke VMs must be configured to query it directly; VNet peering does not automatically propagate DNS settings.
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
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the spoke VNet's custom DNS server to 10.50.1.4. — Option B is correct because the spoke VNet must be configured to use a custom DNS server to override Azure's default internal name resolution. By setting the spoke VNet's DNS server to 10.50.1.4, all VMs in the spoke will query that server for hostname resolution, including app01.corp.local. This is a VNet-level setting that applies to all VMs in the spoke, and it does not require any changes to NSGs or peering configurations.
What should I do if I get this AZ-104 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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Last reviewed: Jun 11, 2026
This AZ-104 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-104 exam.
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