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210-255 · Question #164
210-255 Question #164: Real Exam Question with Answer & Explanation
The correct answer is D: 802.1x. IEEE 802.1X is the industry-standard protocol for port-based Network Access Control, enabling automatic authentication and authorization enforcement at the network edge.
Security Policies and Procedures
Question
Which technology is the leading industry approach used to automatically enforce NAC?
Options
- ASNMP
- Bport security
- CIGMP
- D802.1x
Explanation
IEEE 802.1X is the industry-standard protocol for port-based Network Access Control, enabling automatic authentication and authorization enforcement at the network edge.
Common mistakes.
- A. SNMP is used for network device monitoring and management via polling and traps, and has no built-in mechanism to enforce access control decisions.
- B. Port security restricts access using statically configured MAC address lists per switch port and is not a scalable or automated NAC enforcement mechanism.
- C. IGMP is a network-layer protocol that manages multicast group membership and plays no role in authenticating or controlling network access.
Concept tested. 802.1X as the standard for automated NAC enforcement
Topics
#802.1x#NAC#network access control#port security
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