During the EAP process and specifically related to the client authentication session, which encrypted key is sent from the RADIUS server to the access point?
During the Extensible Authentication Protocol (EAP) process, the RADIUS server and the client establish a secure session for authentication. As part of this process, the RADIUS server sends a session key to the access point (AP).
This session key (also known as the Pairwise Master Key (PMK)) is encrypted and sent securely from the RADIUS server to the AP after the client successfully authenticates.
The AP then derives encryption keys from this session key to encrypt wireless traffic.
Why Not the Other Options?
Option Reason for Elimination
A. WPA key WPA does not use a specific "WPA key" sent by the RADIUS server. Instead, the session key (PMK) is used to derive encryption keys like the PTK (Pairwise Transient Key).
C. Encryption key The RADIUS server does not send an "encryption key" directly. Instead, it sends the session key, which is later used to derive encryption keys.
D. Shared-secret key The shared-secret key is used for authentication between the RADIUS server and the AP, but it is not sent to the AP during the EAP process.
Once a client is associated with the AP, it must be
authenticated and cryptographic keys generated for its session.
An entire hierarchy of keys must be generated, beginning with
the Master Session Key (MSK).
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