Network Access Control: 802.1X, EAP and RADIUS
by Froga
Keeping unknown devices off the network before they reach it — the three parties in an 802.1X exchange, what the switch does and does not decide, and where EAP ends and RADIUS begins.
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Study material
Three parties, and the middle one is the easiest to misread: the switch enforces the decision but never makes it. It relays credentials to the server and applies whatever verdict comes back.
Match each 802.1X role to the device that plays it.
match
Supplicant
Authenticator
Authentication server
The laptop asking to join
The switch or access point holding the port shut
The RADIUS server holding the identities
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