Logical Security Models and Permission Controls for A+
Short answer
Logical security protects digital resources. Use the principle of least privilege when the problem is excessive or unnecessary access and the fix is to reduce rights. Use Zero Trust when the scenario describes denying implicit trust and verifying each access request (device checks, continuous validation). Use ACLs when a scenario requires specifying which users or groups can read, write, or execute a particular resource.
Why it appears on the exam
- Given a short support scenario, choose least privilege when the fix is to reduce standing access, choose ACL when the problem is missing or wrong permissions on a resource, choose Zero Trust when the scenario highlights continuous verification or untrusted devices.
Key concepts
Concept 1
Required terms
principle of least privilege: A security principle that grants users or processes the minimal rights necessary to perform their tasks. Zero Trust model: A security approach that assumes no implicit trust; every access request is continuously verified regardless of network location. access control lists (ACLs): Resource-associated lists that specify which users or groups have which permissions on that resource.
Example
A user complains they can access files across departments unnecessarily -> least privilege is the guiding principle.
Concept 2
How Logical Security Models and Permission Controls works
Logical security protects digital resources. Use the principle of least privilege when the problem is excessive or unnecessary access and the fix is to reduce rights. Use Zero Trust when the scenario describes denying implicit trust and verifying each access request (device checks, continuous validation). Use ACLs when a scenario requires specifying which users or groups can read, write, or execute a particular resource.
Example
A file server denies write access because the user's group is not listed -> ACL is the direct control to examine.
Concept 3
Common confusion
Technicians often swap least privilege and ACLs: least privilege is the principle (reduce rights overall), while ACLs are one mechanism to enforce permissions on a resource. Another common error is applying physical controls (badges, locks) to logical permission problems.
Example
An organization wants to stop implicitly trusting devices on the corporate network -> Zero Trust approach applies.
Concept 4
Core 2 (220-1202) question cues
Given a short support scenario, choose least privilege when the fix is to reduce standing access, choose ACL when the problem is missing or wrong permissions on a resource, choose Zero Trust when the scenario highlights continuous verification or untrusted devices.
Example
A user complains they can access files across departments unnecessarily -> least privilege is the guiding principle.
Sample questions
Select an answer to reveal the explanation. For tracked practice and weak-area review, use the Cultiv8 app.
Q1.A technician is troubleshooting this situation: A user complains they can access files across departments unnecessarily -> least privilege is the guiding principle. What should they identify?
Q2.A technician sees this situation: A file server denies write access because the user's group is not listed -> ACL is the direct control to examine. Which answer should they choose?
Q3.Read this A+ scenario: An organization wants to stop implicitly trusting devices on the corporate network -> Zero Trust approach applies. Which term or action matches it?
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