In this particular topic you have learned the two the two broad categories of bandwidth utilization: multiplexing and spreading. If you skip the summary visit Transmission Media which can be broadly defined as anything that can carry information from a source to a destination.
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- When the angle of incidence is _______ the critical angle, the light beam bends along the interface.
- A) less than
- B) equal to
- C) more than
- D) none of the above
- Transmission media lie below the _______ layer.
- A) application
- B) transport
- C) network
- D) physical
- _________ cable consists of an inner copper core and a second conducting outer sheath.
- A) Twisted-pair
- B) Shielded twisted-pair
- C) Coaxial
- D) Fiber-optic
- __________ consists of a central conductor and a shield.
- A) Twisted-pair
- B) Coaxial
- C) Fiber-optic
- D) none of the above
- _______ cable can carry signals of higher frequency ranges than _______ cable.
- A) Coaxial; twisted-pair
- B) Twisted-pair; fiber-optic
- C) Coaxial; fiber-optic
- D) none of the above
- _________ are used for cellular phone, satellite, and wireless LAN communications.
- A) Radio waves
- B) Infrared waves
- C) Microwaves
- D) none of the above
- The inner core of an optical fiber is _______ in composition.
- A) copper
- B) glass or plastic
- C) bimetallic
- D) liquid
- What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?
- A) insulating material
- B) inner conductor
- C) diameter of cable
- D) outer conductor
- Signals with a frequency below 2 MHz use _______ propagation.
- A) line-of-sight
- B) sky
- C) ground
- D) none of the above
- In an optical fiber, the inner core is _______ the cladding.
- A) less dense than
- B) denser than
- C) the same density as
- D) another name for
- ________ cable consists of two insulated copper wires twisted together.
- A) Twisted-pair
- B) Coaxial
- C) Fiber-optic
- D) none of the above
- In fiber optics, the signal is _______ waves.
- A) radio
- B) light
- C) infrared
- D) very low-frequency
- Signals with a frequency above 30 MHz use _______propagation.
- A) line-of-sight
- B) sky
- C) ground
- D) none of the above
- A parabolic dish antenna is a(n) _______ antenna.
- A) unidirectional
- B) bidirectional
- C) omnidirectional
- D) horn
- A(n) _______ medium provides a physical conduit from one device to another.
- A) unguided
- B) guided
- C) either (a) or (b)
- D) none of the above
- ________ cable is used for voice and data communications.
- A) Twisted-pair
- B) Coaxial
- C) Fiber-optic
- D) none of the above
- Signals with a frequency between 2 MHz and 30 MHz use _______ propagation.
- A) ground
- B) line-of-sight
- C) sky
- D) none of the above
- Transmission media are usually categorized as _______.
- A) determinate or indeterminate
- B) fixed or unfixed
- C) guided or unguided
- D) metallic or nonmetallic
- ________ are used for short-range communications such as those between a PC and a peripheral device.
- A) Radio waves
- B) Infrared waves
- C) Microwaves
- D) none of the above
- _________ media transport electromagnetic waves without the use of a physical conductor.
- A) Guided
- B) Unguided
- C) Either (a) or (b)
- D) None of the above
- ________ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
- A) Twisted-pair
- B) Coaxial
- C) Fiber-optic
- D) none of the above
- Which of the following primarily uses guided media?
- A) radio broadcasting
- B) satellite communications
- C) local telephone system
- D) cellular telephone system
- When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.
- A) refraction
- B) reflection
- C) criticism
- D) incidence
- Which of the following is not a guided medium?
- A) fiber-optic cable
- B) coaxial cable
- C) twisted-pair cable
- D) atmosphere
- Microwaves are _________.
- A) omnidirectional
- B) bidirectional
- C) unidirectional
- D) none of the above
- ________ cables carry data signals in the form of light.
- A) Twisted-pair
- B) Coaxial
- C) Fiber-optic
- D) none of the above
- Radio waves are _________.
- A) unidirectional
- B) omnidirectional
- C) bidirectional
- D) none of the above
- In a fiber-optic cable, the signal is propagated along the inner core by _______.
- A) refraction
- B) reflection
- C) modulation
- D) none of the above
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