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Layer 1 is the first layer of the Open Systems Interconnect (OSI) Model. Layer 1 consists of the various networking hardware and transmission technologies being employed by networks.
This layer is the first and serves as the foundation, the fundamental layer underneath the logical data structures of other higher level network functions. This is considered as the most complex layer simply because of all the different hardware combinations there is possible.
Layer 1 is also known as the Physical Layer.