TAILIEUCHUNG - CCNA Wireless Official Exam Certification Guide part 23

CCNA Wireless Official Exam Certification Guide part 23 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. | 192 CCNA Wireless Official Exam Certification Guide Foundation Topics Understanding the Different LWAPP Modes LWAPP can operate in either Layer 2 LWAPP mode or Layer 3 LWAPP mode. The Layer 2 mode is considered out of date and Cisco prefers and recommends Layer 3 mode. Layer 3 mode is the default LWAPP mode on most Cisco devices. At a high level and after the AP has an IP address the phases of LWAPP operation include these Step 1. An AP sends an LWAPP discovery request message. This is a broadcast that is sent at Layer 2. Step 2. Assuming that a controller is operating in Layer 2 LWAPP mode the wireless LAN controller WLC receives the LWAPP discovery request and responds with an LWAPP discovery response message. Note Only Cisco 1000 Series LAPs support Layer 2 LWAPP mode. Also Layer 2 LWAPP mode is not supported on Cisco 2000 Series WLCs. These WLCs support only Layer 3 LWAPP mode. Step 3. The AP chooses a controller based on the response received and sends a join request. Step 4. The WLC receiving the LWAPP join request responds to the AP join request with an LWAPP join response. This process is going to include a mutual authentication. An encryption key is created to secure the rest of the join process and any future LWAPP control messages. Step 5. After the AP has joined the WLC LWAPP messages are exchanged and the AP initiates a firmware download from the WLC if the AP and WLC have a version mismatch . If the onboard firmware of the AP is not the same as that of the WLC the AP downloads firmware to stay in sync with the WLC. The firmware download mechanism utilizes LWAPP. Step 6. After the WLC and AP match firmware revisions the WLC provisions the AP with the appropriate settings. These settings might include service set identifiers SSID security parameters parameters such as data rates and supported PHY types radio channels and power levels. Step 7. After the provisioning phase is completed the AP and WLC enter the LWAPP runtime state and begin .

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