The answer is that access is denied because the user's clearance is lower than the file's classification. This outcome is dictated by the MAC no read up rule, formally known as the simple security property of the Bell-LaPadula model, which prevents a subject from reading an object at a higher security level. On the ISC2 Certified in Cybersecurity CC exam, this principle tests your understanding of how mandatory access control enforces data confidentiality through hierarchical labels like Confidential, Secret, and Top Secret. A common trap is confusing this with the *no write down* rule, which controls writing instead of reading. To remember it, think of the mnemonic "No Read Up, No Write Down" — if the clearance is lower, reading is blocked; if the clearance is higher, writing is restricted.
ISC2 CC Access Controls Concepts Practice Question
This CC practice question tests your understanding of access controls concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A company uses a mandatory access control (MAC) system where all files are labeled 'Confidential', 'Secret', or 'Top Secret'. A user with 'Secret' clearance tries to read a 'Top Secret' file. What is the outcome?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Access is denied because the user's clearance is lower than the file's classification
In a mandatory access control (MAC) system, access decisions are based on comparing the user's clearance level with the file's classification label. Since the user has 'Secret' clearance and the file is labeled 'Top Secret', the clearance is lower than the file's classification, so access is denied. This follows the fundamental MAC principle of 'no read up' (simple security property) in Bell-LaPadula model.
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.
✗
Access is allowed because the user has a legitimate need
Why it's wrong here
Need-to-know is considered after clearance, but clearance must be at least equal to classification.
✓
Access is denied because the user's clearance is lower than the file's classification
Why this is correct
The simple security property prohibits reading up.
Related concept
Read the scenario before looking for a memorised answer.
✗
Access is denied only if the file also has a category
Why it's wrong here
The classification alone is sufficient to deny; categories add further restrictions.
✗
Access is allowed because the user has Secret clearance
Why it's wrong here
Secret is lower than Top Secret, so reading up is denied.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that 'need to know' or user role overrides clearance in MAC, but MAC strictly enforces clearance versus classification without considering discretionary permissions or need.
Detailed technical explanation
How to think about this question
Under the Bell-LaPadula model, the simple security property (no read up) enforces that a subject cannot read an object with a higher classification. In practice, MAC systems like SELinux or Windows Mandatory Integrity Control use labels (e.g., sensitivity levels) and enforce these rules at the kernel level, preventing any bypass even if the user has explicit permissions from DAC. Real-world scenarios include military or government systems where Top Secret files must be protected from Secret-cleared personnel, regardless of role.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Access Controls Concepts — This question tests Access Controls Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Access is denied because the user's clearance is lower than the file's classification — In a mandatory access control (MAC) system, access decisions are based on comparing the user's clearance level with the file's classification label. Since the user has 'Secret' clearance and the file is labeled 'Top Secret', the clearance is lower than the file's classification, so access is denied. This follows the fundamental MAC principle of 'no read up' (simple security property) in Bell-LaPadula model.
What should I do if I get this CC 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.
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Question Discussion
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