A technician must plug a small duplex fiber connector into an SFP on a factory switch. Which connector is that small duplex form?
Select an answer to reveal the explanation.
Short Explanation
Small-form modules want a small duplex plug, and that plug is the LC. You are looking at the latching connector that seats in an SFP, not the round bayonet, not the larger square SC, and not the multi-fiber MPO plug used for parallel optics.
Full Explanation
An SFP presents a small optical interface, and the connector that matches the common duplex SFP is the LC. It is a small latching duplex plug, two fibers side by side, sized for that module. An ST connector is a round bayonet. You push it in and twist to lock. It is the wrong shape for a duplex SFP. An SC connector is a square push-pull plug, larger than an LC. It is a real fiber connector and the usual wrong grab when someone remembers only that fiber plugs are square. The size is the tell. An MPO connector carries many fibers in one plug for parallel optics. It is not the duplex connector a single SFP takes. Forcing an SC or an MPO into the cage can crack the module even though both are fiber connectors. Exam caveat: some SFPs are built for a single strand, so read the module before you force a connector. The small duplex form the question names is still the LC. Operational check: confirm the module is an LC duplex SFP, match the latch direction, and seat the plug until it clicks rather than twisting it like a bayonet.