CCNA Wireless Official Exam Certification Guide part 24 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. | 202 CCNA Wireless Official Exam Certification Guide controller for WLAN A. Each WLAN has a different primary secondary and tertiary controller. Figure 11-8 Controller Redundancy Another form of controller redundancy is using link aggregation LAG or multiple AP managers. You can also have a primary and backup port on a controller. If the primary goes down you can use the backup. Common designs for controller redundancy include the following N 1 This design has a single backup for multiple controllers. If you have five controllers with one backup for all of them to share the backup can easily become overwhelmed if more than one controller is down at a time. N N This design allows each controller to back up the other. For example AP-1 points to WLC1 as its primary and WLC2 as its secondary. AP-2 points to WLC2 as its primary and WLC1 as its secondary. Load balancing is desired between APs and controllers. Also if one controller is maxed out with APs the design is no good. N N 1 This is the most redundant design. Each controller backs up the other and an extra is designed as a backup. Take the same example as N N but add a third controller WLC-BACKUP that every AP points to as the tertiary. The AP Is Joined Now What You can change the mode by navigating to Wireless APs All APs Detail. Now that you have an AP joined with a controller what can it do Most people expect it to get them to the Internet. Your AP can actually serve numerous roles based on the mode Chapter 11 Controller Discovery and Association 203 it is in. Different APs support different modes. An AP can operate in each of the following modes Local Monitor Sniffer Rogue Detector Hybrid REAP Bridge The sections that follow describe each of these modes in greater detail. Local Mode This is business as usual for an AP. In this mode the AP scans all channels over a 180-sec-ond period for monitoring services and it inspects management packets for intrusion detection system IDS signature matches. You can also use
