Interlogix NS3562-8P-2S, Руководство пользователя, Страница: 143 / 245

Chapter 4: Web configuration
NS3562-8P-2S User Manual 141
• Client — The 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
operating systems (the client is the supplicant in the IEEE 802.1X specification).
• Authentication server — Performs the actual authentication of the client. The
authentication server validates the identity of the client and notifies the switch if 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.
• Switch (802.1X device) — Controls the physical access to the network based on
the authentication status of the client. The switch acts as an intermediary (proxy)
between the client and the authentication server, requesting identity information
from the client, verifying that information with the authentication server, and relaying
a response to the client. The switch includes the RADIUS client, which is
responsible for encapsulating and decapsulating the Extensible Authentication
Protocol (EAP) frames and interacting with the authentication server. When the
switch receives EAPOL frames and relays them to the authentication server, the
Ethernet header is stripped and the remaining EAP frame is re-encapsulated in the
RADIUS format. The EAP frames are not modified or examined during
encapsulation, and the authentication server must support EAP within the native
frame format. When the switch receives frames from the authentication server, the
server's frame header is removed, leaving the EAP frame, which is then
encapsulated for Ethernet and sent to the client.