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(EAPo UDP is also termed .) –For access points as well as Catalyst 2970, 2960, 2955, 2950, and 2940 series switches, the encapsulation information in the EAP messages is based on IEEE 802.1X port-based authentication.When using IEEE 802.1X for authentication, the switch uses EAP over LAN (EAPOL) frames.The most likely security risk is from a device on which antivirus software is not installed or is disabled.If you enable the software, the devices might not have the latest virus definitions and scan engines.These sections describe NAC: • NAC Device Roles • Posture Validation • AAA Down Policy • NAC Layer 2 IEEE 802.1X Authentication and Validation • NAC Layer 2 IP Validation With NAC, the devices in the network have specific roles, as shown in Figure 1 and described below.•—This is a host that requests access to the protected LAN network and is the one whose posture is validated against the company corporate IT-Security policy.
Note Cisco Aironet access points running Cisco IOS Release 12.3(4)JA or later support NAC Layer 2 IEEE 802.1X authentication and validation by default; no configuration is required on the access points.
The access points simply relay NAC communication between clients and switches. It can be a Layer 2 or Layer 3 device at the network edge to which endpoint devices connect.
The NAD initiates the posture validation process and then bridges the endpoint device and the authenticating server.
Although antivirus vendors are making it more difficult to disable antivirus software, the risk of outdated virus definitions and scan engines still exists.
NAC authenticates endpoint devices or clients and enforces access control policies to prevent infected devices from adversely affecting the network.