Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Exhibit
NSG: nsg-app Inbound security rules: - Priority 100 Deny TCP 8443 Source: VirtualNetwork Destination: AppTier-ASG - Priority 200 Allow TCP 8443 Source: WebTier-ASG Destination: AppTier-ASG - Priority 300 Allow TCP 443 Source: VirtualNetwork Destination: AppTier-ASG ASG membership: - VM-Web1 is in WebTier-ASG - VM-App1 is in AppTier-ASG Observed result: - VM-Web1 cannot connect to VM-App1 on TCP 8443
Based on the exhibit, what should the administrator change to allow only the web tier to reach the app tier on TCP 8443?
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
Move the allow rule for WebTier-ASG to a priority lower than 100.
The deny rule at priority 100 matches all traffic from VirtualNetwork to AppTier-ASG on TCP 8443, including the web tier. The allow rule must evaluate first.
B
Distractor review
Change the deny rule source from VirtualNetwork to Internet.
That would no longer block traffic from the web tier, but it would also weaken the intended protection by allowing broader VirtualNetwork access.
C
Distractor review
Associate the NSG with the virtual machine NIC instead of the subnet.
Changing the NSG association location does not fix rule precedence. The same deny rule would still block the traffic if it remains higher priority.
D
Distractor review
Replace the ASG destination with the subnet address range.
Using the subnet range would not solve the precedence problem and would make the rule less precise than the ASG-based design.
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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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: Move the allow rule for WebTier-ASG to a priority lower than 100. — Azure NSG rules are processed in priority order, where the lowest priority number wins. In the exhibit, the deny rule at priority 100 matches TCP 8443 from VirtualNetwork to AppTier-ASG, which includes the web subnet traffic. The allow rule for WebTier-ASG is lower priority, so it never gets evaluated. Moving the allow rule to a priority lower than 100 lets only the web tier match first, while other VirtualNetwork sources remain blocked. Why others are wrong: Changing the source to Internet would not preserve the intended internal-only design and could permit more than the web tier. Moving the NSG to the NIC changes the attachment point, but not the fact that the deny rule still wins by priority. Replacing the destination ASG with a subnet range reduces precision and still does not address the rule-order conflict.
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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