10GBase-SR and 10GBase-LR are two types of 10 Gbps Ethernet standards for optical fiber communication.
10GBase-SR (Short Reach) is a 10 Gbps Ethernet standard for short-distance optical fiber communication, typically used for data center and campus network applications. It supports distances up to 300 meters over multi-mode fiber (MMF) cable.
10GBase-LR (Long Reach) is a 10 Gbps Ethernet standard for long-distance optical fiber communication, typically used for WAN (Wide Area Network) applications. It supports distances up to 10 kilometers over single-mode fiber (SMF) cable, making it well suited for high-speed inter-building or inter-data center connections.
C is right
Model Wave length F.O.Mode Distance Standard
SFP-10G-SR 850 nm Multimode 300 m Duplex LC 10GBASE-SR
SFP-10G-LR 1310 nm Singlemode 10 km Duplex LC 10GBASE-LR
C is correct
10GBase-SR (Short Reach) uses multimode
10GBase-LR (Long Reach) uses single-mode
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