Final answer:
In Cisco lightweight AP configurations, Bridge mode enables multiple APs to form a mesh network. This is utilized in large areas where physical cabling is unfeasible. FlexConnect, Sniffer, and Local are other modes with distinct functions not related to mesh networking.
Step-by-step explanation:
The Cisco lightweight AP mode that can form a mesh when enabled on multiple APs is the Bridge mode. In Bridge mode, APs can connect to each other wirelessly, allowing the network to extend its coverage area, especially in situations where physical cable connections are not feasible or cost-effective. This is especially useful in large areas such as campuses or city-wide networks where laying physical cables is impractical.
The other modes provided as options have different functionalities: FlexConnect is for remote offices where APs might not have a constant connection to the controller, Sniffer is for capturing and analyzing network traffic, and Local mode is for APs connected directly to a WLC (Wireless LAN Controller) with full features but without mesh capabilities.