Which allows for seamless wireless roaming between access points?

A wireless LAN controller (WLC) keeps track of which LWAP a client has associated it with and centrally forwards the packets to the LWAP that's appropriate for a client to access while roaming. A single SSID by itself will not support seamless roaming between access points. A single service set such as a basic service set will not support seamless roaming of wireless clients. 802.11ac is a wireless modulation specification and by itself does not support the seamless roaming of clients.