The switches are connected in series via fiber optic cables

Multiple switches can be connected in series (daisy-chained) using fiber optic cables with SFP modules, but careful attention to topology, fiber type, and redundancy is essential.Fiber Type and SFP ModulesWhen connecting switches over fiber, the choice of fiber depends on distance:Multimode fiber is suitable for short runs (typically under 1000 feet or ~300 meters) and is cost-effective for intra-building connections .Single-mode fiber is preferred for longer distances (over 1000 feet) and provides higher bandwidth and lower signal loss .Each switch must have SFP or SFP+ transceiver modules compatible with the fiber type. Duplex fiber (two strands) is standard, with one strand for transmitting and one for receiving . Ensure the fiber connections are reversed between ports (A to B, B to A) to maintain proper signal flow.Topology ConsiderationsDaisy Chain (Series): Switches are connected one after another. This is simple but can create a single point of failure; if one switch fails, downstream switches may lose connectivity .Star Topology: All switches connect to a central core switch. This reduces the risk of cascading failures and is easier to manage, though it requires more fiber strands .Redundancy: For critical networks, consider dual connections or a partial mesh to prevent downtime if a fiber link or switch fails. Avoid creating loops without proper spanning tree protocol (STP) configuration to prevent broadcast storms .Practical SetupSelect fiber type based on distance and bandwidth requirements.Install SFP/SFP+ modules in each switch port.Use duplex LC connectors for standard connections; pre-terminated cables simplify installation .Connect switches in the chosen topology (series/daisy chain or star).Configure network settings such as VLANs, STP, and link aggregation if needed for redundancy and performance .SummaryConnecting multiple switches in series with fiber is feasible and effective for high-speed, long-distance LAN connections. Key factors include choosing the correct fiber type, using compatible SFP modules, and carefully planning the network topology to balance simplicity, performance, and redundancy. For larger networks, a star or hybrid topology is generally preferred over a pure daisy chain to minimize risk of network disruption.