cisco certification network associate

cisco certification network associate.a.If the user is authenticated, an ACCESS-ACCEPT message is sent. The message will contain attribute field authorization information and vendor-specific information that the RADIUS server uses to provide the service.b.If the user's access request is denied, an ACCESS-REJECT message is issued.c. If additional information is required from the user, an ACCESS-CHALLENGE message is sent indicating that the RADIUS server needs to send an additional query to the access server before allowing the user to be authenticated. After the ACCESS-CHALLENGE message is sent, the access server also sends a new ACCESS-REQUEST message.Figure 4-13 shows the exchange of RADIUS protocol messages between the RADIUS client and server during the authentication and authorization phases.Protocol Message Type I ACCESS-REQUEST Message User Name, PasswordfCCESS-REJECT/ACCESS-REJECT Messaging User Services, Framework AgreementAccess service ACCESS-CHALLENGE message (optional) ___________ RADIUS serverReply messageFigure 4-13 The exchange of RADIUS protocol messages between the RADIUS client and the server during the authentication and authorization phaseDuring the accounting phase, two types of RADIUS protocol messages are exchanged between the RADIUS client and the server: ACCOUNTING-REQUEST and ACCOUNTING-RESPONSE messages. For example, the accounting function can be used to specify the duration of the user's access to the network (the start and end of the session).