Which type of roaming event occurs when a client roams across multiple mobility groups?

Layer 1 refers to the physical layer, which is not directly involved in defining different roaming types based on mobility groups.

Layer 7 refers to the application layer and is not directly associated with the networking mechanics of client roaming across mobility groups.

Layer 3 roaming happens when a client moves between access points controlled by different wireless LAN controllers, especially when those controllers are in different mobility groups or subnets, requiring an IP address update or tunneling mechanism like mobility anchoring. This type of roam involves routing and IP address management across different Layer 3 domains.

Layer 2 roaming occurs within the same subnet/VLAN, typically when a client moves between APs connected to the same WLC or WLCs within the same mobility group and subnet.