The answer is that the ipSecurityRestrictions array allows traffic from 192.168.0.0/24 and denies all other traffic. This is correct because ARM template ipSecurityRestrictions rules are evaluated in priority order, with lower numerical priority values processed first. The first rule, with a lower priority number, permits the specified corporate IP range, while the second rule, with a higher priority, denies all other traffic by targeting the "Any" address. On the Microsoft Cybersecurity Architect exam, this tests your understanding of how rule ordering directly impacts access control in Azure App Service configurations—a common trap is assuming rules are evaluated in array order rather than by explicit priority values. Remember that priority acts like a firewall ACL: the first match wins, so the allow rule must come before the catch-all deny. A useful memory tip is "low priority lets in, high priority locks out."
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
Refer to the exhibit. You are reviewing an ARM template for an Azure App Service configuration. What is the effect of the ipSecurityRestrictions array?
It allows all traffic because the deny rule has a higher priority number.
Why wrong: Higher priority number means lower priority; the deny is evaluated after the allow.
B
It denies traffic from 192.168.0.0/24 and allows all other traffic.
Why wrong: The allow rule has lower priority number (100) and comes first, so it is evaluated before the deny.
C
It denies all traffic because the deny rule covers any IP.
Why wrong: The allow rule for the corporate subnet has priority 100, which is higher priority than the deny at 200, so the allow takes effect for that subnet.
D
It allows traffic from 192.168.0.0/24 and denies all other traffic.
The first rule allows the corporate subnet, the second denies everything else.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It allows traffic from 192.168.0.0/24 and denies all other traffic.
The rules are evaluated in priority order. The first rule allows traffic from 192.168.0.0/24. The second rule denies all other traffic (Any). This effectively restricts access to only the specified corporate IP range. The order matters because if the deny rule had lower priority, it would block the allowed range.
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.
✗
It allows all traffic because the deny rule has a higher priority number.
Why it's wrong here
Higher priority number means lower priority; the deny is evaluated after the allow.
✗
It denies traffic from 192.168.0.0/24 and allows all other traffic.
Why it's wrong here
The allow rule has lower priority number (100) and comes first, so it is evaluated before the deny.
✗
It denies all traffic because the deny rule covers any IP.
Why it's wrong here
The allow rule for the corporate subnet has priority 100, which is higher priority than the deny at 200, so the allow takes effect for that subnet.
✓
It allows traffic from 192.168.0.0/24 and denies all other traffic.
Why this is correct
The first rule allows the corporate subnet, the second denies everything else.
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 SC-100 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 SC-100 ACL questions on filtering logic and placement.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: It allows traffic from 192.168.0.0/24 and denies all other traffic. — The rules are evaluated in priority order. The first rule allows traffic from 192.168.0.0/24. The second rule denies all other traffic (Any). This effectively restricts access to only the specified corporate IP range. The order matters because if the deny rule had lower priority, it would block the allowed range.
What should I do if I get this SC-100 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 SC-100 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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