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CAS-004 Practice Question: Is deploying a wireless network for a…
A security engineer is deploying a wireless network for a high-security facility. Which protocol should be used to provide the strongest authentication and encryption for client devices?
⚠ Common exam trap
A common misconception is that WPA3-Personal with SAE is sufficient for enterprise security, but the trap is that it still uses a shared passphrase and lacks the per-user authentication and centralized control provided by 802.1X, which is critical for high-security environments.
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
✓
WPA3-Enterprise with 802.1X
WPA3-Enterprise with 802.1X is the correct choice because it provides the strongest authentication and encryption for a high-security facility. It uses Simultaneous Authentication of Equals (SAE) for secure key exchange, mandates GCMP-256 encryption, and integrates with 802.1X/EAP for per-user, certificate-based authentication, eliminating shared passphrase vulnerabilities.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
WEP with 128-bit key
Why it's wrong here
WEP is completely broken and should never be used.
- ✗
WPA2-PSK with AES
Why it's wrong here
WPA2-PSK is pre-shared key, not per-user, and has known vulnerabilities like KRACK.
- ✓
WPA3-Enterprise with 802.1X
Why this is correct
WPA3-Enterprise uses individual credentials and stronger encryption than WPA2.
- ✗
WPA3-Personal with SAE
Why it's wrong here
WPA3-Personal provides strong password-based authentication but is not enterprise-grade.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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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.