Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
An administrator is deploying a new VPN gateway in an existing VNet. The GatewaySubnet currently uses a /28 range, and the deployment fails because the selected gateway configuration does not have enough available IP addresses. What is the best action?
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
Move one of the gateway's NICs into a normal workload subnet.
VPN gateway components must remain in GatewaySubnet and cannot be moved to a workload subnet.
B
Best answer
Expand GatewaySubnet to a larger range, such as /27, and redeploy the VPN gateway.
GatewaySubnet is a dedicated subnet for VPN gateway resources, and the gateway requires enough free IP addresses to deploy and operate. If the current prefix is too small for the chosen configuration, the correct fix is to expand the subnet to a larger size, such as /27, if the VNet address space allows it. After resizing, the administrator can retry the gateway deployment with adequate capacity.
C
Distractor review
Create a private endpoint inside GatewaySubnet to reserve extra addresses.
Private endpoints do not reserve gateway capacity and are not used to fix gateway IP shortages.
D
Distractor review
Enable BGP so the gateway needs fewer IP addresses.
BGP affects route exchange, not the IP address requirements of the GatewaySubnet itself.
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.
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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: Expand GatewaySubnet to a larger range, such as /27, and redeploy the VPN gateway. — VPN gateways need a dedicated GatewaySubnet with enough available addresses for the chosen SKU and configuration. If the subnet is too small, the deployment can fail even though the VNet exists. The proper fix is to expand GatewaySubnet to a larger prefix, such as /27 or larger if the address space permits, and then redeploy the gateway. This addresses the capacity issue directly instead of trying to work around it with unrelated features. Why others are wrong: Gateway resources cannot be placed into ordinary workload subnets. Private endpoints do not help with VPN gateway sizing or reservation of address space. BGP influences route exchange between networks, but it does not change the number of IPs required in GatewaySubnet for deployment and operation.
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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