_____ cables are glass tubes surrounded by concentric layers of glass,called "cladding," to form a light path through wire cables.
A) Twisted-pair
B) Copper line
C) Air-spaced coaxial
D) Fiber-optic
Correct Answer:
Verified
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Q27: The _ layer of the Open Systems
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A)It ensures
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A)utility
B)packet
C)protocol
D)topology
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