What OSI physical layer term describes the physical medium which uses electrical pulses?

What OSI physical layer term describes the physical medium which uses electrical pulses?

• A. fiber-optic cable
• B. air
• C. copper cable
• D. goodput

Answer: (C)

In the OSI physical layer, the medium and how signals are carried are the focus. Electrical pulses are voltages or current changes that travel along a conductor, which is exactly what copper cables do. Copper (like twisted-pair or coaxial) carries data by changing electrical signals as bits. Fiber-optic cables, by contrast, carry light through glass, not electricity. Air is used for wireless transmission, which sends electromagnetic waves through the air rather than electrical pulses in a conductor. Goodput is a performance measure, not a transmission medium. So the medium described as using electrical pulses is copper cable.

In the OSI physical layer, the medium and how signals are carried are the focus. Electrical pulses are voltages or current changes that travel along a conductor, which is exactly what copper cables do. Copper (like twisted-pair or coaxial) carries data by changing electrical signals as bits.

Fiber-optic cables, by contrast, carry light through glass, not electricity. Air is used for wireless transmission, which sends electromagnetic waves through the air rather than electrical pulses in a conductor. Goodput is a performance measure, not a transmission medium.

So the medium described as using electrical pulses is copper cable.