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cisco certification online.2. 802.1X802.IX is an IEEE standard for enforcing port-based access control. Simply put, an 802.1X access device is allowed to pass traffic through a network port only after it has been authenticated and successfully authorized.Figure 4-17 shows the status before and after 802.1X authentication and authorization. In a network with 802.1X enabled, the devices involved in 802.X authentication and authorization are divided into the following 3 main types.Before IEEE802.1X authentication, authorization B After IEEE802.1X authentication, authorizationAuthentication server (authenticationserver): the entity that provides authentication services to the authenticator. The authentication server determines whether the applicant is entitled to access the service. The authentication server is sometimes referred to as a Policy Decision Point (PDP).O Examples of authentication servers are Cisco ACS and Cisco ISEOSupplicant: An entity that requires an authenticator (help) to complete authentication, for example, a laptop computer connected directly to a switch port.authenticator: An entity that helps perform authentication directly with other entities within a LAN, sometimes called a Policy EnforcementPoint (PEP), for example, CiscoStatus Before and After 802.1X Authentication and Authorization210 Chapter 4 Introduction to Access ControlThe switch and APO may also require other components, such as an identity database or PKI infrastructure, to properly deploy 802.1X authentication. Figure 4-18 shows how the authentication server, applicant, and authenticator are deployed. The applicant is directly connected to the switch through a wired connection to the