CAS-004 Security Engineering Practice Question
An organization is planning to deploy digital certificates for various use cases. Which TWO of the following certificate types are typically used for email security?
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
✓
Client certificates
S/MIME certificates are specifically used for secure email (encryption and signing). Client certificates can also be used for email authentication (e.g., in some setups). Code signing is for software, DV/OV/EV 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.
- ✓
Client certificates
Why this is correct
Client certificates can be used for email authentication and signing.
- ✗
Code signing certificates
Why it's wrong here
Code signing is for signing software, not email.
- ✗
Extended validation (EV) certificates
Why it's wrong here
EV certificates are for websites, not email.
- ✓
S/MIME certificates
Why this is correct
S/MIME is used for email encryption and signing.
- ✗
Domain-validated (DV) certificates
Why it's wrong here
DV certificates are for websites, 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.