HP ProCurve NAC 800 User Manual page 321

2. The AP (authenticator) opens a port for EAP messages, and blocks all
others.
3. The AP (authenticator) requests the client's (supplicant's) identity.
4. The Client (supplicant) sends its identity.
5. The AP (authenticator) passes the identity on to the authentication server.
6. The authentication server performs the authentication and returns an
accept or reject message to the AP (authenticator).
7. The AP (authenticator) allows or blocks the client's (supplicant's) access
to the network by controlling which ports are open or closed.
Figure 11-1. 802.1X Components
802.1X Quarantine Method
About 802.1X
11-3