350-401 Question #1272: Real Exam Question with Answer & Explanation

Question

Which access control feature does MAB provide?

Options

• Asimultaneous user and device authentication
• Ballows devices to bypass authentication
• Cnetwork access based on the physical address of a device
• Duser access based on IP address

Explanation

MAC Authentication Bypass (MAB) provides network access control by authenticating devices based on their unique MAC address, typically against a central authentication server.

Common mistakes.

• A. MAB authenticates devices, not users, and does not provide simultaneous user and device authentication; that is typically handled by 802.1X with separate authentication processes.
• B. MAB does not allow devices to bypass authentication entirely; instead, it uses the MAC address as the authentication credential.
• D. MAB operates at Layer 2 using MAC addresses, not Layer 3 using IP addresses, for device authentication.

Concept tested. MAC Authentication Bypass (MAB)

Reference. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/mab.html

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