Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A subnet NSG contains these inbound rules: Deny-All-Inbound at priority 300, Allow-HTTPS-From-Bastion at priority 200, and Allow-HTTPS-From-AdminIP at priority 350. An administrator expects a management workstation on the internet to connect to a VM over TCP 443, but the connection is blocked. What is the most likely reason?
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
NSG rules are evaluated from the highest priority number to the lowest priority number.
Azure NSGs evaluate lower priority numbers first, so this statement reverses the actual order.
B
Best answer
The deny rule at priority 300 is matched before the allow rule at priority 350.
NSG rules are processed in ascending order, where the lowest priority number wins. In this case, Deny-All-Inbound at 300 is evaluated before the new allow rule at 350. Because the deny rule matches inbound traffic first, the packet is blocked and the later allow rule never gets a chance. The fix is to give the allow rule a lower number than 300 or otherwise narrow the deny rule.
C
Distractor review
Azure NSGs cannot allow inbound traffic from public IP addresses.
NSGs can absolutely allow traffic from public IPs when the rule scope and priority are configured correctly.
D
Distractor review
TCP 443 requires an application security group to be used as the source.
Application security groups are optional targeting tools and are not required for allowing HTTPS from a public source IP.
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.
Related practice questions
Related AZ-104 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
AZ-104 Azure RBAC practice questions
Practise AZ-104 questions linked to AZ-104 Azure RBAC.
AZ-104 storage account practice questions
Practise AZ-104 questions linked to AZ-104 storage account.
AZ-104 virtual network practice questions
Practise AZ-104 questions linked to AZ-104 virtual network.
AZ-104 NSG practice questions
Practise AZ-104 questions linked to AZ-104 NSG.
AZ-104 Azure Monitor practice questions
Practise AZ-104 questions linked to AZ-104 Azure Monitor.
AZ-104 backup practice questions
Practise AZ-104 questions linked to AZ-104 backup.
AZ-104 managed identity practice questions
Practise AZ-104 questions linked to AZ-104 managed identity.
AZ-104 load balancer practice questions
Practise AZ-104 questions linked to AZ-104 load balancer.
AZ-104 Azure Policy practice questions
Practise AZ-104 questions linked to AZ-104 Azure Policy.
AZ-104 virtual machine practice questions
Practise AZ-104 questions linked to AZ-104 virtual machine.
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?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: The deny rule at priority 300 is matched before the allow rule at priority 350. — The block happens because NSG processing is priority-based, and lower numbers are evaluated first. Since the deny rule is at 300 and the new allow rule is at 350, the deny matches before the allow can take effect. To fix it, the administrator should place the allow rule at a priority lower than 300, assuming the source, destination, protocol, and port also match the traffic being tested. Why others are wrong: NSGs do not use descending priority order, so the first option describes the opposite of Azure behavior. Public IP sources are allowed when explicitly permitted, so that is not a limitation. Application security groups can simplify targeting, but they are not a requirement for allowing HTTPS from a management workstation. The issue here is rule order, not the source type.
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
Loading comments…
Sign in to join the discussion.