CompTIA Security+ Certification Study Guide (Exam SY0-601) by Glen E. Clarke

Author:Glen E. Clarke
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2022-03-15T00:00:00+00:00

802.1X Stages of Communication When preparing for the Security+ certification exam, it is important to know the stages of 802.1X communication and the protocols used at each stage. Figure 10-5 depicts the following stages of communication between the 802.1X components:

Figure 10-5

802.1X communication phases

1. EAPOL Start Communication starts with the client machine, or supplicant, sending an EAPOL Start message. This is a layer-2 frame requesting access to the switch or wireless access point.

2. EAPOL Identity Request The switch or wireless access point, also known as the authenticator, sends an EAPOL frame back to the supplicant requesting the supplicant identify itself.

3. EAPOL Identity Response The supplicant sends an EAPOL response message that includes its authentication information. This could be a username and password or it could be a certificate.

4. Credentials sent The authenticator uses RADIUS to send an IP packet containing the credentials to the authentication server.

5. RADIUS Access: Accept/Reject The authentication server sends back a RADIUS Access message to the authenticator that includes either an accept or reject status. If the credentials were verified, it sends an Access-Accept message, and if the credentials were incorrect, it sends an Access-Reject message.

6. EAPOL Success/Fail Finally, the authenticator sends an EAPOL message to the supplicant with a success or fail status. With a Success message, the client system is granted access to the network.

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