Transmission media are usually categorized as

Transmission media lie below the ......... layer.

.......... cable consists of an inner copper core and a second conducting outer sheath.

In fiber optics, the signal is ......... waves.

Which of the following primarily uses guided media?

Which of the following is not a guided medium?

What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?

In an optical fiber, the inner core is .......... the cladding.

The inner core of an optical fiber is ........ in composition.

When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, ............ occurs.