- A
Create a private DNS zone for corp.local and link it only to the spoke subnet.
Why wrong: Private DNS zones are useful for Azure private endpoints, but they do not automatically use your existing custom DNS server for all internal records.
- B
Set the spoke virtual network to use 10.50.0.4 as a custom DNS server.
Configuring the spoke VNet with the hub DNS server IP sends name-resolution requests to the centralized server. Because VNet peering already provides network connectivity, the spoke can query 10.50.0.4 directly for internal names without deploying a second DNS server.
- C
Add a user-defined route in the spoke to send DNS traffic to the hub VNet.
Why wrong: Routes control next hop selection for packets, but they do not replace DNS client configuration or determine which resolver a VM uses.
- D
Enable gateway transit on the peering and set use remote gateways on the spoke.
Why wrong: Gateway transit is for using a VPN or ExpressRoute gateway across peered VNets, not for fixing ordinary name resolution between VNets.
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 company has a hub virtual network with a DNS server VM at 10.50.0.4 that hosts internal names such as app01.corp.local. A spoke virtual network is already peered to the hub. VMs in the spoke can reach resources in the hub by IP address, but they cannot resolve the internal host names. The company wants to keep DNS centralized and avoid deploying another DNS server in the spoke. What should the administrator configure?
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 virtual network to use 10.50.0.4 as a custom DNS server.
Option B is correct because the spoke virtual network must be configured to use the hub DNS server (10.50.0.4) as a custom DNS server. This ensures that all VMs in the spoke send DNS queries to the hub server, which hosts the internal zone for corp.local. Since the hub and spoke are already peered, DNS traffic can flow over the peering connection without additional routing, keeping DNS centralized.
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.
- ✗
Create a private DNS zone for corp.local and link it only to the spoke subnet.
Why it's wrong here
Private DNS zones are useful for Azure private endpoints, but they do not automatically use your existing custom DNS server for all internal records.
- ✓
Set the spoke virtual network to use 10.50.0.4 as a custom DNS server.
Why this is correct
Configuring the spoke VNet with the hub DNS server IP sends name-resolution requests to the centralized server. Because VNet peering already provides network connectivity, the spoke can query 10.50.0.4 directly for internal names without deploying a second DNS server.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add a user-defined route in the spoke to send DNS traffic to the hub VNet.
- ✗
Enable gateway transit on the peering and set use remote gateways on the spoke.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse DNS resolution with routing or gateway transit, thinking they need to add a UDR or enable gateway features to forward DNS queries, when the real fix is simply changing the DNS server setting on the spoke VNet to point to the hub's DNS server IP.
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 VMs to use that DNS server IP. The spoke VMs will then send DNS queries to 10.50.0.4 over the VNet peering, which supports all TCP/UDP traffic including DNS (port 53). This approach works because VNet peering is non-transitive but allows direct communication between peered VNets, so no extra routing is needed for DNS traffic.
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
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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 virtual network to use 10.50.0.4 as a custom DNS server. — Option B is correct because the spoke virtual network must be configured to use the hub DNS server (10.50.0.4) as a custom DNS server. This ensures that all VMs in the spoke send DNS queries to the hub server, which hosts the internal zone for corp.local. Since the hub and spoke are already peered, DNS traffic can flow over the peering connection without additional routing, keeping DNS centralized.
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.
About these practice questions
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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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