The correct answer is that this Azure Policy denies creation of network security rules that allow traffic to ports other than 22 and 3389. This policy works by evaluating the destination port range in any inbound NSG rule and blocking the rule if it permits traffic to any port outside of SSH (22) and RDP (3389), effectively enforcing a strict allowlist for remote management only. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how Azure Policy can enforce security baselines by denying non-compliant resource configurations, often appearing as a trick where candidates confuse deny logic with allow logic—remember, a deny policy blocks what it doesn’t explicitly permit, not the other way around. A common trap is assuming the policy allows the listed ports, but the key is that it denies everything else. Memory tip: think of it as a bouncer who only lets in guests with tickets for ports 22 and 3389, turning everyone else away.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Denies creation of network security rules that allow traffic to ports other than 22 and 3389
Option C is correct because the policy denies security rules that allow ports other than 22 (SSH) and 3389 (RDP) as destination ports. Option A is wrong because it allows only specific ports. Option B is wrong because it allows those ports. Option D is wrong because it doesn't enforce a specific range.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Requires that all network security rules have destination port range between 22 and 3389
Why it's wrong here
The policy does not enforce a range; it denies rules with ports outside the list.
✗
Denies all inbound traffic except SSH and RDP
Why it's wrong here
The policy does not deny traffic; it denies the security rules themselves.
✗
Allows only SSH and RDP inbound traffic
Why it's wrong here
The policy denies creation of rules that allow other ports, but doesn't allow any traffic directly.
✓
Denies creation of network security rules that allow traffic to ports other than 22 and 3389
Why this is correct
The policy uses 'deny' effect on security rules where destinationPortRange is not in [22,3389].
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-100 NAT questions on configuration and troubleshooting.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Denies creation of network security rules that allow traffic to ports other than 22 and 3389 — Option C is correct because the policy denies security rules that allow ports other than 22 (SSH) and 3389 (RDP) as destination ports. Option A is wrong because it allows only specific ports. Option B is wrong because it allows those ports. Option D is wrong because it doesn't enforce a specific range.
What should I do if I get this SC-100 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-100 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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