Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
Inbound NSG rules on the app subnet: Priority 100 Deny TCP 8443 Source: VirtualNetwork Destination: Any Priority 110 Allow TCP 8443 Source: AzureLoadBalancer Destination: Any Priority 200 Deny Any Source: Any Destination: Any The web tier and app tier are in the same virtual network. The app tier uses application security group ASG-App. The web tier uses application security group ASG-Web.
Based on the exhibit, why is TCP 8443 traffic from the web tier still denied to the app tier, and what should you do to allow only the web tier?
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
Change the deny-all rule at priority 200 to allow TCP 8443 from ASG-Web.
That rule is lower priority and never gets evaluated for this traffic because an earlier deny already matches.
B
Best answer
Add an inbound allow rule for TCP 8443 from ASG-Web to ASG-App with a priority lower than 100.
An allow rule must be evaluated before the existing deny rule, and using ASGs limits access to the web tier.
C
Distractor review
Add a route table entry for 8443 traffic from the web tier to the app tier.
Routes determine next hop selection, not whether NSG rules allow or deny a port.
D
Distractor review
Remove the AzureLoadBalancer rule because it is overriding the web tier traffic.
The AzureLoadBalancer rule only affects probe traffic and does not block web tier connections.
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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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Add an inbound allow rule for TCP 8443 from ASG-Web to ASG-App with a priority lower than 100. — NSG rules are evaluated in priority order, and the lowest number wins. The deny rule at priority 100 matches all traffic from the VirtualNetwork service tag on TCP 8443, so web tier traffic is blocked before any later rule is considered. To allow only the web tier, you should add an allow rule with a higher priority than 100 and scope it with ASG-Web as the source and ASG-App as the destination. Why others are wrong: Changing the deny-all rule at priority 200 does not help because the earlier deny at 100 already blocks the flow. A route table cannot override an NSG decision. Removing the AzureLoadBalancer rule is irrelevant because it applies only to load balancer health probes, not to application-to-application traffic.
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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