Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A web tier and an app tier run on separate Azure VMs in the same region. Each VM's NIC is added to an application security group named WebASG or AppASG. The administrator must allow only the web tier to connect to the app tier on TCP 8443, and future VM scale-outs must be included automatically. Which NSG rule should be created?
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
An inbound rule that uses the current web VM's private IP as the source and the current app VM's private IP as the destination.
IP-based rules work for one VM, but they do not scale cleanly when the tiers grow or change.
B
Best answer
An inbound rule with source WebASG, destination AppASG, protocol TCP, and destination port 8443.
Using application security groups is the best fit because the rule follows the role of the VM, not a fixed IP address. When new web or app VMs are added to their respective ASGs, the NSG rule automatically covers them. This provides least-privilege connectivity between tiers while keeping the configuration maintainable during scale-out and redeployment events.
C
Distractor review
A route table that sends TCP 8443 traffic from the web subnet to the app subnet.
Route tables decide where traffic goes, but they do not allow or deny TCP ports between workloads.
D
Distractor review
An Azure Firewall application rule collection that permits all traffic between the two subnets.
Azure Firewall could filter traffic, but this option is broader than requested and does not describe the most direct NSG-based tier control.
Common exam trap
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Technical deep dive
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
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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
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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?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: An inbound rule with source WebASG, destination AppASG, protocol TCP, and destination port 8443. — The requirement is classic tier-to-tier filtering with scale in mind. Application security groups let you target VMs by role instead of by fixed IPs, so the rule continues to work when VMs are added, removed, or replaced. By setting the source to WebASG, the destination to AppASG, and the port to 8443, the administrator creates a precise and scalable allow rule for only the desired traffic. Why others are wrong: A rule based on the current VM IPs is fragile and breaks when instances are recreated or scaled. A route table cannot enforce port-level authorization, so it will not solve this access requirement. Azure Firewall is powerful, but the question asks for the specific NSG design that preserves tier separation; an all-traffic firewall rule is much broader than needed.
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.
Discussion
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