The answer is that the storage account is not accessible from any network. This is correct because the DefaultAction is set to Deny, and both the IpRules and VirtualNetworkRules arrays are empty, meaning no explicit allow rules exist to override the default denial of all traffic. In the Microsoft Security, Compliance, and Identity Fundamentals SC-900 exam, this scenario tests your understanding of Azure Storage Account network access configuration, specifically how the deny all by default principle works when no rules are defined. A common trap is confusing an empty rules list with allowing all networks—remember, if DefaultAction is Deny and no rules are present, the result is total isolation. For the exam, always check the DefaultAction first; if it says Deny and rule lists are empty, the answer is always that no network traffic is permitted. Memory tip: "Deny default, no rules, no access."
SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The storage account is not accessible from any network.
DefaultAction is Deny, and no rules are defined. This means all network traffic is denied by default. Option B is correct. Option A says 'all networks' which would be Allow. Option C says only specific IPs, but IpRules is empty. Option D says only VNets, but VirtualNetworkRules is empty.
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.
✗
The storage account is accessible only from specific virtual networks.
Why it's wrong here
Incorrect: VirtualNetworkRules is empty.
✗
The storage account is accessible from all networks.
Why it's wrong here
Incorrect: DefaultAction is Deny, not Allow.
✓
The storage account is not accessible from any network.
Why this is correct
Correct: DefaultAction Deny with no rules blocks all traffic.
Related concept
Standard ACLs match source addresses.
✗
The storage account is accessible only from specific IP addresses.
Why it's wrong here
Incorrect: IpRules is empty.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 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-900 ACL questions on filtering logic and placement.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The storage account is not accessible from any network. — DefaultAction is Deny, and no rules are defined. This means all network traffic is denied by default. Option B is correct. Option A says 'all networks' which would be Allow. Option C says only specific IPs, but IpRules is empty. Option D says only VNets, but VirtualNetworkRules is empty.
What should I do if I get this SC-900 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-900 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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