Answer Posted / Raju Ram
FDDI (Fiber Distributed Data Interface), ATM (Asynchronous Transfer Mode), and SONET (Synchronous Optical Network) are physical layer protocols that operate at the bottom of the OSI model. These technologies provide high-speed data transmission over optical fiber. While they have differences in architecture and applications, they all serve to transport data between network devices and are used in various network environments.nnFDDI is primarily used in local area networks (LANs) and was designed as a dual ring architecture for fault tolerance. ATM is a packet-switched technology that provides a connectionless service suitable for multimedia applications. SONET is a standard for synchronous digital transmission over optical fiber, offering various data rates and providing a basis for other higher-layer protocols.
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