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ESAT (Data Comms and Networking (3rd Ed.) by Berhouz A. Forouzan) > ESAT Forouzan - Chapter 7: Transmission Media > Flashcards

ESAT Forouzan - Chapter 7: Transmission Media Flashcards

1
Q

Transmission media are usually categorized as _____.
a. Fixed or unfixed
b. Guided or unguided
c. Determinate and indeterminate
d. Metallic and nonmetallic

A

b. Guided or unguided

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2
Q

Transmission media are closest to the ______ layer
a. Physical
b. Network
c. Transport
d. Application

A

a. Physical

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3
Q

Category 1 UTP cable is most often used in _____ networks.
a. Fast Ethernet
b. Traditional Ethernet
c. Infrared
d. Telephone

A

d. Telephone

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4
Q

BNC connectors are used by _____ cables.
a. UTP
b. STP
c. Coaxial
d. Fiber-Optic

A

c. Coaxial

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5
Q

_____ cable consists of an inner copper and a second conducting outer sheath.
a. Twisted pair
b. Coaxial
c. Fiber-Optic
d. Shielded twisted pair

A

b. Coaxial

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6
Q

In fiber optics, the signal source is _____ waves.
a. Light
b. Radio
c. Infrared
d. Very low-frequency

A

a. Light

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7
Q

Smoke signal are example of communication though _____.
a. A guided medium
b. An unguided medium
c. A refractive medium
d. A small or large medium

A

b. An unguided medium

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8
Q

Which of the following primarily uses guided media?
a. Cellular telephone system
b. Local Telephone System
c. Satellite communications
d. Radio Broadcasting

A

b. Local Telephone System

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9
Q

Which of the following is not a guided medium?
a. Twisted-pair cable
b. Coaxial cable
c. Fiber-Optic Cable
d. Atmosphere

A

d. Atmosphere

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10
Q

In an environment with many high-voltage devices, the best transmission medium would be _____.
a. Twisted-pair cable
b. Coaxial cable
c. Optical cable
d. The Atmosphere

A

c. Optical cable

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11
Q

What is the major factor that makes coaxial-cable less susceptible to noise than twisted-pair cable?
a. Inner conductor
b. Diameter of cable
c. Outer conductor
d. Insulating material

A

c. Outer conductor

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12
Q

The RG number gives us information about _____.
a. Twisted pairs
b. Coaxial cable
c. Optical fibers
d. All of the above

A

b. Coaxial cable

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13
Q

In an optical fiber, the inner core is _____ the cladding.
a. Denser than
b. Less dense than
c. The same density as
d. Another name for

A

a. Denser than

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14
Q

The inner core of an optical fiber is _____ in composition.
a. Glass or plastic
b. Copper
c. Bimetalic
d. Liquid

A

a. Glass or plastic

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15
Q

Optical fibers, unlike wire media, are highly resistant to _____.
a. High-frequency transmission
b. Low-frequency transmission
c. Electromagnetic interference
d. Refraction

A

c. Electromagnetic interference

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16
Q

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. Reflection
b. Refraction
c. Incidence
d. Criticism

A

a. Reflection

17
Q

When the angle of incidence is _____ the critical angle, the light beam bends along the interface.
a. More than
b. Less than
c. Equal to
d. None of the above

A

c. Equal to

18
Q

In _____ propagation, the beam of propagated light is almost horizontal, and the low-density core has a small diameter compared to the cores of the other propagation modes.
a. Multimode step-index
b. Multiple graded-index
c. Multimode single-index
d. Single-mode

A

d. Single-mode

19
Q

_____ is the propagation method subject to the greatest distortion.
a. Multimode step-index
b. Multimode Graded-index
c. Multiple single-index
d. Single-mode

A

a. Multimode step-index

20
Q

In _____ propagation, the core is varying densities.
a. Multimode step-index
b. Multimode graded-index
c. Multimode single-index
d. Single-mode

A

b. Multimode graded-index

21
Q

When we talk about unguided media, usually we are referring to _____.
a. Metallic wires
b. Nonmetallic wires
c. The air
d. None of the above

A

c. The air

22
Q

Radio wave and microwave frequencies range from ______.
a. 3 to 300 KHz
b. 300 KHz to 300 GHz
c. 3 KHz to 300 GHz
d. 3 KHz to 3000 GHz

A

c. 3 KHz to 300 GHz

23
Q

In _____ propagation, low frequency radio waves hug the earth.
a. Ground
b. Sky
c. Line of sight
d. Space

A

a. Ground

24
Q

The VLF and LF bands use _____ propagation for communications.
a. Ground
b. Sky
c. Line of sight
d. Space

A

a. Ground

25
Q

A parabolic dish antenna is a(n) _____ antenna.
a. Omnidirectional
b. Bidirectional
c. Unidirectional
d. Horn

A

c. Unidirectional

26
Q

The _____ is an association that sponsors the use of infrared waves.
a. IrDA
b. EIA
c. FCC
d. PUD

A

a. IrDA

ESAT (Data Comms and Networking (3rd Ed.) by Berhouz A. Forouzan) (31 decks)

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