CAS-004 Security Engineering Practice Question
Which of the following certificate types is most appropriate for an organization that needs to validate the identity of individuals for email encryption and signing?
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
✓
S/MIME certificate
S/MIME certificates are specifically designed for securing email. Client certificates are for authentication. Code signing is for software. DV certificates are for websites.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
S/MIME certificate
Why this is correct
S/MIME certificates are used for email signing and encryption.
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Domain Validation (DV) certificate
Why it's wrong here
DV certificates only validate domain ownership, not individual identity.
- ✗
Client authentication certificate
Why it's wrong here
Client certificates are for authenticating users to servers, not for email.
- ✗
Code signing certificate
Why it's wrong here
Code signing certificates are for signing software, not email.
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JA
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.