I want to connect 4 x 3560 switches via Fiber on SFP ports, one to other. These switches are about 250 meters apart from each other. What kind of fiber cable, connectors and SFP module should I use?
I would install an OM4 rated multimode fiber (MMF). This would enable the link to be upgrade to 10GE in the future. Type of cable jacket will depend on installation environment, whether indoor, outdoor, jacket fire rating, etc.
SFP modules require LC type connectors. If the fiber is being terminated on a patch panel, you could use LCs on the panels as well or whatever your network is using now. Just select the appropriate connectors for the end of the jumpers.