Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A subnet uses a route table with gateway route propagation disabled so internet-bound traffic can be forced through a network virtual appliance. After the change, VMs in the subnet can no longer reach servers in the on-premises network 172.16.0.0/16 over the VPN gateway. What should the administrator add to the route table?
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
Best answer
A user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway.
When gateway route propagation is disabled, the subnet no longer learns on-premises routes automatically from the VPN gateway. Adding a specific route for the on-premises prefix with next hop Virtual network gateway restores reachability to that network while keeping the forced-tunneling design for other traffic.
B
Distractor review
A user-defined route for 172.16.0.0/16 with next hop type Internet.
Sending on-premises traffic to the Internet would not reach the private VPN network and would break the intended hybrid path.
C
Distractor review
An NSG allow rule for TCP 172.16.0.0/16.
NSGs operate on ports and protocols, not destination route selection, so they cannot restore the missing hybrid route.
D
Distractor review
A service endpoint for the on-premises network range.
Service endpoints are only for supported Azure services and do not apply to arbitrary on-premises prefixes over a VPN gateway.
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: A user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway. — Disabling gateway route propagation removes automatically learned routes, including routes to on-premises networks connected through the VPN gateway. To restore access to 172.16.0.0/16 while preserving the forced-tunneling design, the administrator should add a specific UDR for that prefix with next hop type Virtual network gateway. This reintroduces the hybrid route without changing the rest of the traffic flow. Why others are wrong: B sends the traffic to the wrong next hop and would not reach the private on-premises network. C confuses security filtering with routing; an NSG allow rule does not create connectivity. D is unrelated to on-premises networks and cannot be used for arbitrary private address ranges behind a VPN gateway.
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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