Exam 350-401 topic 1 question 1055 discussion

D is correct . From Cisco <As the client moves from AP to AP, the controller manages all roaming activity, and the client is not affected. Even when a client roams to a different controller, it is not affected and will not even recognize the roaming event. This seamless roaming process implies that both controllers are IN THE SAME mobility group or domain.>

Answer A is correct "Layer 3 roaming in wireless networks typically takes place between different mobility groups (but in the same mobility domain). A mobility group refers to a set of WLCs that share information to facilitate client roaming. When a client device roams between access points controlled by different WLCs within the same mobility group, it’s usually referred to as layer 2 roaming. In this scenario, the client maintains its IP address and session as it moves between access points, and the WLCs coordinate handoffs seamlessly. However, when a client roams between access points controlled by WLCs in different mobility groups, it’s considered layer 3 roaming. In this case, the client may need to obtain a new IP address and establish a new session as it moves between different subnets or networks managed by different WLCs."

chatGPT agrees

It's D. The "client" key word is missing from A, making it incorrect. A successful L3 client roam is provided by controllers in different groups. For Layer 3 roaming to function effectively within Cisco Mobility Groups, several dependencies must be met: 1. Mobility Group Configuration: All participating WLCs must be correctly configured within the same mobility group to share client and access point information. 2. Mobility List Entries: Controllers can communicate across different mobility groups if they include each other in their mobility lists, allowing clients to roam between access points in different groups. 3. Consistent IP Addressing: Clients should maintain the same IP address while roaming across different subnets. This is facilitated by Cisco Centralized Key Management (CCKM) and proactive key caching (PKC), which are specifically designed for inter-mobility-group roaming. 4. Multicast Messaging: Enabling multicast messaging can optimize communication between controllers, especially in large mobility groups, reducing network traffic and improving efficiency.

The correct answer is: A. It provides seamless roaming between APs that are connected to different Layer 3 networks and different mobility groups. Explanation: Layer 3 Roaming: This type of roaming allows clients to move between access points (APs) that may be on different subnets (Layer 3 networks) and even different mobility groups. It effectively enables clients to maintain their connections and session continuity, even as they switch between these different network environments

D is correct.