This AZ-500 practice question tests your understanding of secure networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 have an Azure virtual machine that hosts a custom web application. You need to restrict inbound internet traffic to only HTTPS (port 443) from any source. Which Azure resource should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Network Security Group (NSG)
Option B is correct because a Network Security Group (NSG) with an inbound rule allowing HTTPS traffic from any source while denying all other traffic meets the requirement. Option A is wrong because Azure Firewall is overkill and more expensive for a single VM. Option C is wrong because Azure Bastion is for RDP/SSH access, not web traffic. Option D is wrong because Application Security Groups (ASGs) are used to group VMs, not to define inbound rules directly.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Application Security Group (ASG)
Why it's wrong here
ASGs are used to organize VMs; NSGs use ASGs as source/destination.
✗
Azure Bastion
Why it's wrong here
Azure Bastion provides secure RDP/SSH access, not web traffic filtering.
✗
Azure Firewall
Why it's wrong here
Azure Firewall is a managed firewall service, but for a single VM, an NSG is simpler and more cost-effective.
✓
Network Security Group (NSG)
Why this is correct
NSG with inbound rule allowing HTTPS from Internet blocks other traffic.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-500 ACL questions on filtering logic and placement.
Secure networking — This question tests Secure networking — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Network Security Group (NSG) — Option B is correct because a Network Security Group (NSG) with an inbound rule allowing HTTPS traffic from any source while denying all other traffic meets the requirement. Option A is wrong because Azure Firewall is overkill and more expensive for a single VM. Option C is wrong because Azure Bastion is for RDP/SSH access, not web traffic. Option D is wrong because Application Security Groups (ASGs) are used to group VMs, not to define inbound rules directly.
What should I do if I get this AZ-500 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related AZ-500 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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