Simple definition
A Fibre Channel switch connects hosts and storage arrays in a SAN and controls frame forwarding and zoning.
Purpose and use
A Fibre Channel switch connects server and storage ports within a SAN fabric.
How does it work?
It switches frames and participates in fabric services and configured zoning.
Example and verification
Review port state, link errors and zone membership during troubleshooting.
Points to watch
An active port does not prove that a host sees the correct LUN; masking and host configuration also matter.
In short
Switch connectivity is one part of the storage-access chain.