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Exam 200-310 topic 2 question 223 discussion

Actual exam question from Cisco's 200-310
Question #: 223
Topic #: 2
[All 200-310 Questions]

Which network access control technology is recommended to use with Layer 2 access layer switches?
A.
802.1q
B.
802.1x
C.
802.3af
D.
802.3q
E.
802.11n

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Suggested Answer: B
802.1X provides an authentication framework for wireless LANs, allowing a user to be authenticated by a central authority. The actual algorithm that is used to determine whether a user is authentic is left open and multiple algorithms are possible.
(A.K).
Cisco Guide Reference:
Understanding 802.1X Port-Based Authentication
The IEEE 802.1X standard defines a client-server-based access control and authentication protocol that restricts unauthorized devices from connecting to a LAN through publicly accessible ports. The authentication server authenticates each client connected to a switch port before making available any services offered by the switch or the LAN.
Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN (EAPOL) traffic through the port to which the client is connected. After authentication is successful, normal traffic can pass through the port.
This section includes this conceptual information:

Device Roles -
Authentication Initiation and Message Exchange
Ports in Authorized and Unauthorized States
Supported Topologies

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