the catalyst 2960 switch uses sfp modules for fiber-optic and copper uplink ports. refer to the catalyst 2960 release notes for a list of supported sfp modules.
figure b-2 fiber-optic sfp module lc connector

invisible laser radiation may be emitted from disconnected fibers or connectors. do not stare into beams or view directly with optical instruments.
figure b-3 copper sfp module rj-45 connector