- A
A network security group
NSGs are used to allow or deny network traffic by rule.
- B
A route table
Why wrong: A route table controls where traffic is sent, not whether it is allowed or denied.
- C
A private DNS zone
Why wrong: A private DNS zone handles name resolution, not filtering.
- D
Azure Advisor
Why wrong: Azure Advisor provides recommendations and does not enforce traffic rules.
Question 1,117 of 1,170
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You need to allow or deny traffic to and from resources in an Azure subnet based on source IP address, destination port, and protocol. Which Azure feature should you use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A network security group
A network security group (NSG) is the correct Azure feature because it acts as a stateful, distributed firewall that filters traffic to and from Azure resources in a virtual network. NSGs contain security rules that allow or deny inbound and outbound traffic based on source/destination IP address, port, and protocol (TCP, UDP, or ICMP). This directly matches the requirement to control traffic based on source IP, destination port, and protocol.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A network security group
Why this is correct
NSGs are used to allow or deny network traffic by rule.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A route table
Why it's wrong here
A route table controls where traffic is sent, not whether it is allowed or denied.
When this WOULD be correct
You need to control the next hop for traffic leaving a subnet, such as forcing all internet-bound traffic through a network virtual appliance. A route table with custom routes would be the correct answer.
- ✗
A private DNS zone
Why it's wrong here
A private DNS zone handles name resolution, not filtering.
When this WOULD be correct
You need to resolve a custom domain name (e.g., contoso.com) to private IP addresses within your Azure virtual network, ensuring that resources in the VNet can resolve the name without exposing it to the internet.
- ✗
Azure Advisor
Why it's wrong here
Azure Advisor provides recommendations and does not enforce traffic rules.
When this WOULD be correct
You need to identify and implement recommendations to improve the security posture of your Azure resources, such as enabling network security groups or applying just-in-time VM access. Azure Advisor would provide the relevant security recommendations.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓A network security groupCorrect answer▾
Why this is correct
NSGs are used to allow or deny network traffic by rule.
✗A route tableWrong answer — click to see why▾
Why this is wrong here
Route tables control network traffic routing paths, not allow/deny rules based on source IP, destination port, or protocol. They determine where traffic goes, not whether it is permitted.
★ When this WOULD be the correct answer
You need to control the next hop for traffic leaving a subnet, such as forcing all internet-bound traffic through a network virtual appliance. A route table with custom routes would be the correct answer.
Why candidates choose this
Candidates may confuse routing (path selection) with filtering (permission), assuming that controlling routes can also block traffic, but route tables do not provide access control lists.
✗A private DNS zoneWrong answer — click to see why▾
Why this is wrong here
A private DNS zone is used for custom domain name resolution within a virtual network, not for filtering traffic based on source IP, port, or protocol.
★ When this WOULD be the correct answer
You need to resolve a custom domain name (e.g., contoso.com) to private IP addresses within your Azure virtual network, ensuring that resources in the VNet can resolve the name without exposing it to the internet.
Why candidates choose this
Candidates may confuse DNS with network security, thinking that DNS zones can control access by resolving names to different IPs, but they do not filter traffic.
✗Azure AdvisorWrong answer — click to see why▾
Why this is wrong here
Azure Advisor provides recommendations for best practices in cost, security, reliability, and performance, but it does not allow or deny traffic based on source IP, port, or protocol.
★ When this WOULD be the correct answer
You need to identify and implement recommendations to improve the security posture of your Azure resources, such as enabling network security groups or applying just-in-time VM access. Azure Advisor would provide the relevant security recommendations.
Why candidates choose this
Candidates may confuse Azure Advisor's security recommendations with actual traffic filtering capabilities, thinking it can directly control network access.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse route tables (which control traffic paths) with NSGs (which control traffic permissions), especially when the question mentions 'allow or deny traffic'—route tables never deny traffic, they only redirect it.
Detailed technical explanation
How to think about this question
NSG rules are evaluated in priority order (lowest number first) and are stateful—if an inbound rule allows traffic, the outbound response is automatically allowed regardless of outbound rules. Each rule specifies source/destination IP address ranges (CIDR), port ranges, and protocol (TCP, UDP, or * for all). NSGs can be associated with a subnet (applying to all resources in that subnet) or directly to a NIC (applying only to that specific VM). A common real-world scenario is locking down a web server subnet to only allow inbound HTTP/HTTPS from the internet while denying all other inbound traffic.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A network security group — A network security group (NSG) is the correct Azure feature because it acts as a stateful, distributed firewall that filters traffic to and from Azure resources in a virtual network. NSGs contain security rules that allow or deny inbound and outbound traffic based on source/destination IP address, port, and protocol (TCP, UDP, or ICMP). This directly matches the requirement to control traffic based on source IP, destination port, and protocol.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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