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CAS-004 Deploying a wireless network for guests Practice Question
A company is deploying a wireless network for guests. Which security measure is most important to prevent unauthorized users from accessing internal resources?
⚠ Common exam trap
The trap here is that candidates often focus on wireless authentication or obscurity measures (like WPA2-Enterprise or disabling SSID broadcast) instead of recognizing that network segmentation is the fundamental control for isolating guest traffic from internal resources.
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
✓
Place the guest network on a separate VLAN with no access to internal subnets
Placing the guest network on a separate VLAN with no access to internal subnets provides network segmentation, which is the most effective security measure to prevent unauthorized users from reaching internal resources. This approach uses VLAN tagging (802.1Q) and access control lists (ACLs) to enforce Layer 2 and Layer 3 isolation, ensuring that guest traffic cannot traverse to internal networks even if other wireless security measures are bypassed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use WPA2-Enterprise with 802.1X
Why it's wrong here
WPA2-Enterprise is good for user authentication, but does not isolate guests from internal resources.
- ✗
Disable SSID broadcast
Why it's wrong here
Hiding SSID is obscurity and does not prevent access.
- ✗
Implement MAC address filtering
Why it's wrong here
MAC filtering is easily bypassed and not a strong control.
- ✓
Place the guest network on a separate VLAN with no access to internal subnets
Why this is correct
VLAN segmentation restricts traffic between guest and internal networks.
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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.