Final answer:
A Cisco lightweight AP in FlexConnect mode provides BSS and operates in standalone mode. Mesh mode is required for forming a mesh network with multiple APs. Autonomous mode signifies APs that can operate without a controller, whereas Mesh mode allows interconnectivity for a larger network coverage.
Step-by-step explanation:
A Cisco lightweight Access Point (AP) operating in FlexConnect mode provides a Basic Service Set (BSS); it does not form a mesh when it is enabled on multiple APs. Mesh mode is required to form a mesh when it is enabled on multiple APs. In FlexConnect mode, the APs operate in a standalone manner when it comes to client data traffic processing, as they can switch local traffic independently from the wireless LAN controller.
In contrast, Autonomous mode refers to APs that can function independently without the need for a controller. APs in Mesh mode, however, have the capability to interconnect with each other to form a wireless mesh network, allowing for the expansion of the Wi-Fi network over a larger area without the need for a physical wired backhaul. This mode is particularly useful in situations where running network cables is impractical or too expensive.