passer l'examen ccna

passer l'examen ccna./aaConfiguration DataAP is runningFigure 11.2 AP StatusThe process begins with the discovery of the controller. Since lightweight APs are defined as "zero.touch" at deployment time, you simply plug them in and let them do the rest. In the background, the part you don't see is a little more complicated. The steps in this process start with the discovery of the controller, which is as follows.Step 1 The AP sends a LWAPP discovery request message to the WLC, which is broadcast at layer 2. Since Layer 3 mode is the mode you want to use, this step will fail. Step 2 As soon as the previous step fails, the AP moves to Layer 3 by checking the configuration of its IP address. If the IP address does not exist, the clientend will use DHCP to obtain an IP address. Step 3 The AP uses the information obtained from the DHCP response to contact a controller. Step 4 Any WLC that is receiving an LWAPP discovery request message uses an LWAPP discovery response message11.2 Basic Topics 150as the response. If there is no controller response, the AP then goes to a Layer 2 broadcast and starts the process over. The Cisco implementation uses a search ( hunting) process and a discovery algorithm to find as many controllers as possible. The AP uses the search and discovery process to build a WLC list and then selects a controller from that list and joins that controller. The search process for this controller is repeated until at least one WLC is discovered and joined. The IOS-based AP performs only Layer 3 discovery.The Layer 3 discovery process follows the following steps. Step 1 The AP performs a subnet broadcast to see if there is a controller in the local subnet that is operating in Layer 3 mode. Step 2 The AP performs over-the-air provisioning ( OTAP,over-the-airprovisioning) o