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what is meant by cc na courses.3. Authentication ServerThe authentication server can be external, or it can be a Cisco Secure Access Control Server ( ACS,AccessControlServer) or a free RADIUS server. It really does not matter what authentication server is used, as long as it supports the EAP method that is configured on the controller and used by the applicant and AP. The location of RADIUS needs to be defined on the controller interface, which can be done by selectingSECURITY > RADIUS Authentication Servers> New to complete, as shown in Figure 17-10.17.2 Basic Topics 2773. MAC Address Filtering MAC address filtering is a simple form of authentication of connected devices. MAC address filtering requires defining the MAC addresses that are allowed to connect. Although it is an easy way to ensure that MAC addresses with definedMAC The method. To - Show.Figure 17-11 List of RADIUS ServersThe next step in enabling 802.1X authentication is to define the EAP method, as described below.4. EAP-TLSExtensibleAuthenticationProtocol-TransportLayerSecurity (EAP-TLS) is an EAP method that is often used in wireless networks. In EAP-TLS, both the authentication server and the applicant must install a certificate. For this reason, this method is considered to be one of the most secure and practical methods. This will require the client and server key pairs to be generated first and then signed by the CA server EAP-TLS uses a similar type of communication to SSL encryption* However, TLS is generally seen as a successor to SSL.