Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Exhibit
Application security groups: - WebASG contains the web VM NICs - AppASG contains the app VM NICs App subnet NSG rules: - Priority 300: Deny-All-Inbound | Source: Any | Destination: Any | Port: Any | Action: Deny No allow rule exists for web-to-app traffic.
Based on the exhibit, what inbound NSG rule should the administrator add to allow only the web tier to reach the app tier on TCP 8080?
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
Source: WebASG, Destination: AppASG, Protocol: TCP, Port: 8080, Priority: 250
This rule uses application security groups to target the web tier and app tier precisely. Priority 250 is evaluated before the deny rule at 300, so the allowed web-to-app traffic can pass while everything else remains blocked.
B
Distractor review
Source: Internet, Destination: VirtualNetwork, Protocol: TCP, Port: 8080, Priority: 250
This would allow far more traffic than requested. It does not restrict access to only the web tier.
C
Distractor review
Source: AppASG, Destination: WebASG, Protocol: TCP, Port: 8080, Priority: 250
The source and destination are reversed. That rule would allow app-to-web traffic, not web-to-app traffic.
D
Distractor review
Source: WebASG, Destination: AppASG, Protocol: TCP, Port: 8080, Priority: 350
A priority higher than the deny rule is evaluated later, so the traffic would still be denied first.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Source: WebASG, Destination: AppASG, Protocol: TCP, Port: 8080, Priority: 250 — Application security groups let you reference sets of VMs without hardcoding individual IP addresses. To allow only the web tier to reach the app tier on TCP 8080, the NSG needs a rule that uses WebASG as the source and AppASG as the destination. The rule must also have a lower priority number than the deny-all rule so it is matched first. Why others are wrong: The Internet rule is too broad, the reversed ASG rule allows the wrong direction, and a priority of 350 loses to the deny rule at 300. Azure NSGs are processed in ascending priority order, so the specific allow rule must come before the blanket deny.
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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