7.Transmission Media

When the angle of incidence is ____________ the critical angle, the light beam bends along the interface.

• less than
• equal to
• more than
• none of the above

Transmission media lie below the __________ layer.

• application
• transport
• network
• physical

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

• Twisted-pair
• Shielded twisted-pair
• Coaxial
• Fiber-optic

__________ consists of a central conductor and a shield.

• Twisted-pair
• Coaxial
• Fiber-optic
• none of the above

_______ cable can carry signals of higher frequency ranges than _______ cable.

• Coaxial; twisted-pair
• Twisted-pair; fiber-optic
• Coaxial; fiber-optic
• none of the above

_________ are used for cellular phone, satellite, and wireless LAN communications.

• Radio waves
• Infrared waves
• Microwaves
• none of the above

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

• copper
• glass or plastic
• bimetallic
• liquid

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

• insulating material
• inner conductor
• diameter of cable
• outer conductor

Signals with a frequency below 2 MHz use _______ propagation.

• line-of-sight
• sky
• ground
• none of the above

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

• less dense than
• denser than
• the same density as
• another name for