hardMultiple ChoiceObjective-mapped
CAS-004 Practice Question: Plans to establish a cross-forest trust between…
An organization plans to establish a cross-forest trust between two Active Directory forests to enable resource access. The security architect is concerned about the risk of privilege escalation from a compromised domain in one forest. Which design choice best mitigates this risk?
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
✓
Use selective authentication and restrict the authorized accounts
Using selective authentication restricts what resources users from the trusting forest can access, ensuring that only specified accounts are allowed. Forest-level authentication would allow broader access. SID filtering is enabled by default for cross-forest trusts but is not sufficient alone; selective authentication provides an additional constraint. Disabling the trust is not practical.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Remove the trust entirely and use individual local accounts
Why it's wrong here
This would break the access requirement and is not a security-architecture decision.
- ✗
Configure the trust to use forest-wide authentication instead of selective
Why it's wrong here
Forest-wide authentication grants broader access, increasing risk.
- ✗
Enable SID filtering on both forest trusts
Why it's wrong here
SID filtering prevents elevation of privilege but does not limit which accounts can authenticate; selective authentication is more granular.
- ✓
Use selective authentication and restrict the authorized accounts
Why this is correct
Selective authentication ensures only specified users can access resources in the trusting forest, limiting exposure from a compromise.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.