The physical layer provides __________

A. Mechanical specifications of electrical connectors and cables
B. Electrical specification of transmission line signal level
C. Specification for ir over optical fiber

D. All of the mentioned

Explanation: Anything dealing with a network cable or the standards in use – including pins, connectors and the electric current used is dealt in the physical layer (Layer 1). Physical layer deals with bit to bit delivery of the data aided by the various transmission mediums.

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