CAS-004 Security Architecture Practice Question
An organization is designing a PKI to issue certificates to thousands of IoT devices. Which architectural decision will BEST support automated certificate lifecycle management?
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
✓
Automated enrollment using SCEP
Automated certificate enrollment using SCEP or ACME protocols enables devices to request and renew certificates without manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Online root CA with self-signed certificates
Why it's wrong here
Self-signed certificates lack a trust chain and do not scale.
- ✓
Automated enrollment using SCEP
Why this is correct
SCEP automates certificate enrollment for large numbers of devices.
- ✗
Using a public CA for all IoT devices
Why it's wrong here
Public CAs may be costly and not designed for IoT scale without automation.
- ✗
Offline root CA with manual issuance
Why it's wrong here
Manual issuance does not scale for thousands of devices.
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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.