Physical Layer

_________ is responsible for movements of individual bits from one hop (node) to the next

signal travelling is directed and contained by the physical limits of the medium

• Guided medium

• Unguided medium

Select the types of guided medium

• twisted pair

• Co-axial cable

• Fiber Optic

• Radiowaves

Number of twists per unit of length (e.g., inch) has some effect on the quality of the cable

• True

• False

• May be

If a ray of light travelling through one substance suddenly enters another substance (of a different density), the ray does not change direction.

• True

• False

• may be

Signals are broadcast through free space

• Guided medium

• Unguided medium

Unguided signals can travel from the source to destination using

• Ground propagation

• FibreOptic propagation

• Sky propagation

• Line-of-sight propagation

Radio waves travel through the lowest portion of the atmosphere.

• Ground propagation

• Sky propagation

• Line-of-sight propagation

Higher-frequency radio waves radiate upward into the ionosphere

• Ground propagation

• Sky propagation

• Line-of-sight propagation

very high-frequency signals are transmitted in straight lines directly from antenna to antenna

• Ground propagation

• Sky propagation

• Line-of-sight propagation