TAILIEUCHUNG - CCNA Wireless Official Exam Certification Guide part 25

CCNA Wireless Official Exam Certification Guide part 25 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. | 212 CCNA Wireless Official Exam Certification Guide controller you want to add. Then you paste the contents of the text file into the Edit All page. In Figure 12-3 two controllers are listed on the Edit All page. You can have up to 24 controllers in a mobility group. Figure 12-3 Edit All Page So what happens if a user moves to another mobility domain Because a controller in a different mobility domain does not have information about the client the client must reassociate. When the client reassociates it will most likely get a new IP address and any sessions it currently has will need to be restarted. So now you understand the part that controllers play in roaming. In truth they play an even bigger part depending on the type of roaming that is happening. Cisco controllers can support a Layer 2 or Layer 3 roaming process as detailed in the following sections. Types of Roaming Before we dive into roaming as a Layer 2 or 3 process let s define it. Roaming is the movement of a client from one AP to another while still transmitting. Roaming can be done across different mobility groups but must remain inside the same mobility domain. Consider the following examples. Figure 12-4 shows a client transmitting data and moving from AP1 to AP2. These two APs are in the same mobility domain. This is roaming. Chapter 12 Adding Mobility with Roaming 213 Figure 12-4 Client Roaming in the Same Mobility Group Key Topic Figure 12-5 shows a client transmitting data and moving from AP2 to AP3. These two APs are in different mobility groups but are in the same mobility domain. This too is roaming. Now here is where roaming breaks. In Figure 12-6 a user is transmitting data and decides to go work at a local coffee shop that offers wireless network access. After buying a 5 cup of coffee and settling down into a cushy sofa he fires up his laptop and continues surfing the net. This is not roaming. In this case the user has a new IP address and any sessions that were active before need to be .

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