Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
An NSG rule allows TCP 8443 from ASG-Web to ASG-Api on the API subnet. The web VM NIC is already in ASG-Web, but the API VM was only placed in the subnet and not added to ASG-Api. Traffic still fails. What is the best fix?
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
Add the API VM's NIC to ASG-Api so the NSG rule can match the destination NIC.
Application security groups are assigned to NICs, not to subnets. If the destination NIC is not in ASG-Api, the rule that references ASG-Api never matches, even if the VM sits in the right subnet. Adding the API NIC to the correct ASG allows the NSG rule to evaluate as intended and is the cleanest fix for the blocked 8443 traffic.
B
Distractor review
Add ASG-Api to the API subnet because ASGs are inherited from subnet membership.
ASGs do not inherit from subnet placement; they must be attached directly to the network interface.
C
Distractor review
Lower the rule priority number on the web subnet to make source traffic more specific.
The source subnet is already matched correctly; the problem is destination membership, not priority ordering.
D
Distractor review
Create a user-defined route from AppSubnet to API subnet to bypass the NSG.
Routing does not bypass NSG filtering, so a UDR cannot fix an ASG mismatch.
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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Question 3
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Question 4
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Question 6
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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: Add the API VM's NIC to ASG-Api so the NSG rule can match the destination NIC. — NSG rules that reference application security groups only work when the source and destination NICs are members of the correct ASGs. Being in the correct subnet is not enough. In this scenario, the web VM is already in ASG-Web, but the API VM is missing from ASG-Api, so the allow rule never matches the destination. Adding the API NIC to ASG-Api fixes the rule lookup without changing the network path. Why others are wrong: ASGs are not inherited from subnet membership, so assigning the group to the subnet does nothing. Rule priority matters only after a rule can match; here, the destination NIC is not in the referenced ASG, so priority is irrelevant. A route table changes the next hop but does not disable NSG enforcement, so it cannot solve an ASG-based allow failure.
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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