Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
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
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Create a private DNS zone for corp.local and link it only to the spoke subnet.
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
Best answer
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
Distractor review
Add a user-defined route in the spoke to send DNS traffic to the hub VNet.
Routes control next hop selection for packets, but they do not replace DNS client configuration or determine which resolver a VM uses.
D
Distractor review
Enable gateway transit on the peering and set use remote gateways on the spoke.
Gateway transit is for using a VPN or ExpressRoute gateway across peered VNets, not for fixing ordinary name resolution between VNets.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
CIDR notation defines the prefix length.
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. — The spoke VNet must be configured to use the centralized DNS server at 10.50.0.4. VNet peering allows the spoke VM to reach the DNS server by private IP, but Azure does not automatically inherit custom DNS settings across peering. Once the spoke VNet points to that resolver, internal names such as app01.corp.local can be resolved without adding new DNS infrastructure in the spoke. Why others are wrong: A is a common mix-up with Azure Private DNS zones, but that feature is mainly for Azure private endpoint name resolution. C confuses routing with DNS configuration; routes do not select the resolver a VM queries. D is about sharing a gateway for hybrid connectivity, which does not address internal DNS resolution between peered VNets.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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