Cisco Certified Support Technician (CCST) CybersecurityNetwork SecurityHard
A network architect is designing a secure guest Wi-Fi network for a corporate office. The primary goal is to ensure that guest users have internet access but are completely isolated from the internal corporate network and cannot communicate with each other. Which combination of network security concepts should be implemented?
- AVLANs and Client Isolation
- BVPN and Firewall
- CVLANs and Port Security
- DDMZ and NAT
Show answer & explanationAnswer & explanation
Correct answer: A. VLANs and Client Isolation
VLANs provide logical segmentation, isolating the guest network from the corporate network. Client Isolation (also known as AP isolation or private VLAN edge) prevents devices connected to the same Wi-Fi network (e.g., guest users) from communicating with each other, fulfilling both isolation requirements.
Why the other options are wrong
- B. VPNs secure remote access, and firewalls control traffic, but they don't inherently provide client-to-client isolation on a shared Wi-Fi segment.
- C. Port Security restricts MAC addresses on wired ports, not suitable for Wi-Fi client-to-client isolation.
- D. DMZ is for public-facing servers, and NAT translates IPs; neither directly provides client-to-client isolation on a guest Wi-Fi.
VLANs and Client Isolation
VLANs (Virtual Local Area Networks) logically segment a network, while Client Isolation (or AP Isolation) prevents devices within the same broadcast domain (e.g., on a guest Wi-Fi) from communicating directly with each other.
- VLANs provide network segmentation for different user groups.
- Client Isolation prevents inter-client communication on the same Wi-Fi.
- Ideal for secure guest networks.
- Enhances security by limiting lateral movement and snooping.
Memory trick: Guest Wi-Fi: VLANs for the 'hotel floor', Client Isolation for 'private rooms'.