What message is sent every 30 seconds by the 802.1x authenticator to an endpoint to initiate the MAB authentication process?

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What message is sent every 30 seconds by the 802.1x authenticator to an endpoint to initiate the MAB authentication process?

RADIUS access-accept
EAPoL identity request
RADIUS access-request
EAPoL start

Explanation: The authenticator initiates the 802.1x MAB authentication process by sending an EAPoL identity request message to the endpoint every 30 seconds to determine if it has a supplicant.

Exam with this question: CCNP Core Networking: Modules 25 - 26 Checkpoint Exam: Access Control and Infrastructure Security Exam