Jeff Rodgers
Chapter 3 TEST Q/A
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Which
combinations of charges will be repelled by electric force? (Choose two.) |
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neutral
and neutral |
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neutral
and positive |
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neutral
and negative |
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positive
and positive |
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positive
and negative |
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negative
and negative |
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Select
the characteristics specified by 10BaseT. (Choose three.) |
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twisted
pair cable |
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T
style connectors |
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baseband
transmission |
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10
gigabits per second data rate |
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10
megabits per second data rate |
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decimal
encoded data transmission |
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Which
of the following must be present for current to flow? (Choose three.) |
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closed
loop |
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resistance |
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insulating
material |
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source
of voltage |
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conducting
material |
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bit
generating device |
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Which
of the following are benefits of coaxial cable within a LAN environment?
(Choose two.) |
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easier
to install than UTP |
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less
expensive than fiber |
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requires
fewer repeaters than UTP |
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easily
accommodates additions to network |
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faster
transport speeds than fiber |
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Which
effects comprise impedance? (Choose three.) |
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capacitance |
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voltage |
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current |
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resistance |
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inductance |
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power
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Which
of the following characteristics describe STP cable? (Choose three.) |
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costs
more than UTP |
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easier
to install than UTP |
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uses
the shield to carry data signals |
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twisted
pairs are not required because of the shield |
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must
be grounded at both ends for high frequency signals |
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reduces
both internal and external sources of interference |
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Which
of the following describe the ray model of light? (Choose three.) |
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Light
bends at the boundary of two transparent materials. |
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The
speed of light is greatest when passing through optical glass. |
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The
speed of light is constant no matter what material passes through. |
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The
optical density of the material determines how much the light will bend. |
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The
index of refraction is the ratio of the speed of light in a material compared
to a vacuum. |
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Which
two are necessary to achieve total internal reflection within a fiber-optic
cable? (Choose two.) |
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The
entire incident light ray must be refracted into the cladding. |
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The
index of refraction of the core must be less than that of the cladding. |
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The
index of refraction of the core must be greater than that of the cladding. |
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The
optical density of the reflecting material must be higher than the refracting
index. |
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The
angle of incidence of the light ray must be greater than the critical angle
for the core and cladding. |
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Which
of the following are attributes of singlemode fiber optic cable? (Choose
two.) |
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one
path of light |
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larger
fiber optic core |
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uses
LEDs as a light source |
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distances
up to 5000 meters |
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higher
bandwidth than multimode |
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Which
of the following are characteristics of fiber optic light receivers? (Choose
two.) |
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react
to multiple wavelengths |
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react
to a specific wavelength |
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tuned
to one wavelength for noise reduction |
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use
PIN photodiodes to convert light pulses to electrical signals |
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Which
factors can lead to a loss of signal strength in fiber optic cable? (Select
three.) |
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absorption |
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RFI |
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crosstalk
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scattering |
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dispersion |
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EMI
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Which
tasks must be performed when installing fiber optic cable? (Choose three.) |
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install
connectors |
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inspect
laser signal using a microscope |
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cleave
and polish cable ends |
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wash
cable ends with mild soap and water |
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protect
connector ends from dirt and damage |
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pull
cables tight to reduce the number of bends and twists |
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Which
devices could cause problems with a wireless transmission? (Choose two.) |
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radio |
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TV |
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microwave |
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wireless
phone |
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DVD
remote control |
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Which
of the following are typical specifications for data transmission cables?
(Choose three.) |
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achievable
bit transmission speeds |
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supported
data encoding schemes |
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minimum
distance between hosts |
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maximum
distance before fatal attenuation |
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intended
transmission type |
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intended
bit level protocols type |
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Which
of the following radio carrier signal modulation types will modulate the
height (amplitude) of the carrier signal? |
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AM |
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FM |
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PM |
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RF |
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Which
of the following identifies a node that has been authenticated but not yet
associated with the access point? |
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unauthenticated
and unassociated |
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unauthenticated
and associated |
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authenticated
and unassociated |
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authenticated
and associated |
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Your
company has a new wireless network setup in their building. The boss has
heard the throughput for a wireless network would be 11 Mbps. You mention
that because of the way WLANs transmit and acknowledge data the actual
percentage of throughput would be which of the following? |
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25% |
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40% |
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50% |
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70% |
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What
is the minimum number of devices that can exist in a wireless network? |
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1 |
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2 |
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3 |
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4 |
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Which
of the following wireless standards increased transmission capabilities to 11
Mbps? |
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802.11a |
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802.11b |
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802.11c |
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802.11d |
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Which
term refers to the amount of signal power loss that can be tolerated on a
fiber optic link? |
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linear
laser light loss |
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optical
link loss budget |
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acceptable
decibel power reduction |
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maximum
allowable light attenuation |
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What
is the core size of a single mode fiber-optic cable? |
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8-10
microns |
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15
microns |
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50-60
microns |
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125
microns |
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How
is full-duplex capability achieved in fiber optic cable? |
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Two
fibers are encased in separate sheaths. |
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Light
is bounced at different rates in opposite directions. |
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Transmit
speeds are so high that half-duplex is acceptable. |
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Colors
of the light spectrum are separated into transmit and receive streams. |