Planet IGS-801T [96/120] Understanding ieee 802 x port based authentication

Planet IGS-801T [96/120] Understanding ieee 802 x port based authentication
User’s Manual of IGS-801M
4.9.1 Understanding IEEE 802.1X Port-Based Authentication
ccess control and authentication protocol that restricts
unauthorized clients from connecting to a LAN through publicly accessible ports. The authentication server authenticates
The IEEE 802.1X standard defines a client-server-based a
each client connected to a switch port before making available any services offered by the switch or the LAN.
Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN
(EAPOL) traffic through the port to which the client is connected. After authentication is successful, normal traffic can pass
through the port.
This section includes this conceptual information:
Device Roles
Authentication Initiation and Message Exchange
Ports in Authorized and Unauthorized States
Device Roles
With 802.1X port-based authentication, the devices in the network have specific roles as shown below.
Figure 4-9-1
z Clientthe device (workstation) that requests access to the LAN and switch services and responds to requests
from the switch. The workstation must be running 802.1X-compliant client software such as that offered in the
Microsoft Windows XP operating system. (The client is the supplicant in the IEEE 802.1X specification.)
z Authentication server—performs the actual authentication of the client. The authentication server validates the
identity of the client and notifies the switch whether or not the client is authorized to access the LAN and switch
services. Because the switch acts as the proxy, the authentication service is transparent to the client. In this
release, the Remote Authentication Dial-In User Service (RADIUS) security system with Extensible
Authentication Protocol (EAP) extensions is the only supported authentication server; it is available in Cisco
Secure Access Control Server version 3.0. RADIUS operates in a client/server model in which secure
authentication information is exchanged between the RADIUS server and one or more RADIUS clients.
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