Based on standard naming conventions in network security tools, here is an analysis of what the top feature likely does in such a context:
Most users can switch to this mode within their settings dashboard under the "Network Priority" or "Subnet Management" tab. fbsubnet l top
In some networking contexts, it may refer to Local or Link-layer settings. 3. top (Top-level / Display) Based on standard naming conventions in network security
However, based on the components of the name, it is likely you are referring to one of two things: 1. Networking/Cloud Technology If you are looking at a technical component for Facebook's (Meta's) networking infrastructure fbsubnet l top