ISC2 CC Access Controls Concepts Practice Question
A company configures its firewall to block all inbound traffic except for specific necessary services. This approach aligns with which access control principle?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Least privilege
Least privilege in network security means denying all traffic except explicitly allowed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Separation of duties
Why it's wrong here
Separation of duties involves task division, not firewall rules.
- ✗
Defense in depth
Why it's wrong here
While firewalls are part of defense in depth, the specific action of blocking all but necessary traffic is least privilege.
- ✗
Need-to-know
Why it's wrong here
Need-to-know applies to data access, not network traffic.
- ✓
Least privilege
Why this is correct
Deny by default, allow only necessary traffic is least privilege for networks.
Go deeper
Related to this question
Learn chapter
Introduction to Security Principles
Key term
Network Access Control
Network Access Control is a security solution that enforces policies to control which devices and users can connect to a network, ensuring only authorized and compliant endpoints gain access.
Key term
Access Control List
An Access Control List is a set of rules that decides which traffic is allowed or denied entry to a network or device.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.