How should the concept of mobility domains and mobility groups be explained to a customer?
A.
A mobility group does not constrain the distribution of security context of a client and also does not constrain AP fail-over between controllers when the WLC is in the same mobility domain.
B.
If WLCs are in the same mobility domain, they communicate with each other but, if an anchor WLC is present, it must be in the same mobility domain for communication to be possible.
C.
If WLCs are in the same mobility domain, they communicate with each other. Mobility groups constrain the distribution of security context of a client and also constrain AP fail-over between controllers.
D.
WLCs do not need to be in the same mobility domain to communicate with each other. Mobility groups constrain the distribution of security context of a client and also constrain AP fail-over between controllers.
Mobility has two categories, Mobility Domains & Mobility Groups. If WLCs are in same mobility domain they communicate with each other. Mobility Group constraint the distribution of security context of a client. It also constrain AP fail-over between controllers.
A WLC support 3 mobility groups with up to 24 controllers in a single group for a total of 72 controllers in the mobility domain (or list). WLC 5.1 or later allows seamless roaming across multiple mobility groups in the mobility list of the controller.
https://mrncciew.com/2013/03/16/wireless-mobility-basics/
A mobility domain is a cluster of APs forming a continuous radio frequency space, where the Pairwise Master Key (PMK) can be synchronized, and fast roaming can be enabled for 802.11r
A Mobility Group is a group of Wireless LAN Controllers (WLCs) in a network with the same Mobility Group name.
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