CCNA Wireless Official Exam Certification Guide part 21 is a best of breed Cisco® exam study guide that focuses specifically on the objectives for the CCNA® Wireless IUWNE exam. Senior instructor Brandon Carroll shares preparation hints and test-taking tips, helping you identify areas of weakness and improve both your conceptual knowledge and hands-on skills. Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics. | 172 CCNA Wireless Official Exam Certification Guide Access points Network unification Network management Network services APs in the CUWN Another type of device in a CUWN is a lightweight access point AP . The lightweight AP is controlled and monitored by the Cisco Wireless LAN Controller WLC . The AP communicates using a special protocol called the Lightweight AP Protocol LWAPP to relay information to the WLC about the coverage the interference that the AP is experiencing and client data about associations among other pieces of information. This is a management type of communication and via LWAPP it is encrypted. Client data is also sent inside these LWAPP frame headers. Client data travels from the wireless space to an AP and then through a WLC and off to the rest of the network. When client data is encapsulated into an LWAPP header you have not only the data but also information about the Received Signal Strength Indicator RSSI and signal-to-noise ratio SNR . The WLC uses this information to make decisions that can improve coverage areas. WLCs in the CUWN A single WLC can manage from six to 300 access points. You can create groupings of controllers for more scalability. This type of network could easily get out of hand if you had more than 300 600 or 900 APs. In cases such as this a WCS application can manage a number of controllers as well as a location appliance that can help track where devices are in the network. Note There is obviously more to the solution that what has been discussed in this section. For more information on the Unified Wireless Solution visit http go wireless. This is the home page for the Cisco Unified Wireless Network. Here you can dig into the white papers configuration guides and much more. The major point to understand is that in the CUWN the AP uses LWAPP to exchange control message information with the controller. Client data is also encapsulated into LWAPP between the AP and the controller. The controller then .
