WGU C172 Network and Security –
Foundations Quizzes with Verified
Solutions
refractive index ✔️✔️Ratio of the speed of light in free space to its speed in a given material
infrared light ✔️✔️Light extending from 680 nm up to the wavelengths of the microwaves
optical spectrum ✔️✔️Light frequencies from the infrared on up
cladding ✔️✔️Material surrounding the core, which must have a lower index of refraction to
keep the light in the core
numerical aperture ✔️✔️A measure of a fiber's ability to accept light
multimode fiber ✔️✔️A fiber that supports many optical waveguide modes
pulse dispersion ✔️✔️Stretching of received pulse width because of multiple paths taken by
the light. Limits distance and rate of data transmission
graded-index fiber ✔️✔️Fiber type where the index of refraction is gradually varied with a
parabolic profile. Provides longer lengths and higher bandwidths
,single-mode fiber ✔️✔️Fiber cables with core diameters of about 7-10 µm; light follows a
single path
scattering ✔️✔️Caused by refractive index fluctuations; accounts for 96 percent of attenuation
loss
absorption ✔️✔️Light interaction with the atomic structure of the fiber material; also involves
the conversion of optical power to heat
macrobending ✔️✔️Loss due to light breaking up and escaping into the cladding
microbending ✔️✔️Loss caused by very small mechanical deflections and stress on the fiber
dispersion ✔️✔️Broadening of a light pulse as it propagates through a fiber strand
dense wavelength division multiplexing (DWDM) ✔️✔️Incorporates the propagation of
several wavelengths in the 1550 nm range for a single fiber
isolator ✔️✔️An inline passive device that allows optical power to flow only in one direction
attenuator ✔️✔️Used to reduce the received signal level (RSL)
,mechanical splice ✔️✔️Two fibers joined together with an air gap, requires an index-matching
gel to provide a good splice
Fiber cross-connect ✔️✔️Optical patch panel used to interconnect fiber cables
Backbone ✔️✔️Main fiber distribution
Basic Service Set (BSS) ✔️✔️Term used to describe an independent network; fundamental
topology of WLAN
ad hoc ✔️✔️Another term used to describe an independent network
transceiver ✔️✔️A transmit/receive unit
Extended Service Set (ESS) ✔️✔️The use of multiple access points to extend user mobility
hand-off ✔️✔️When the user's computer establishes an association with another access point
with a stronger signal
Roaming ✔️✔️Term describing the ability to maintain network connectivity while moving
, CSMA/CA ✔️✔️Carrier sense multiple access/collision avoidance. Used in 802.11
direct sequence spread spectrum (DSSS) ✔️✔️A technique used in 802.11 to spread
transmitted data over a wide bandwidth
frequency hopping spread spectrum (FHSS) ✔️✔️A technique used in 802.11 where the
transmit signal frequency changes based on a pseudorandom sequence
hopping sequence ✔️✔️The name for the specific order of frequency changes used in FHSS
orthogonal frequency division multiplexing (OFDM) ✔️✔️Technique used in 802.11 that
divides the signal bandwidth into smaller subchannels over which data is transmitted in parallel
MIMO ✔️✔️A space-division multiplexing technique where the data stream is split into
multiple parts called spatial streams
Multiuser MIMO (MUMIMO) ✔️✔️Use of MIMO technology with eight spatial streams
Beamforming ✔️✔️A technique used to direct transmission of the radio signal to a specific
device
Foundations Quizzes with Verified
Solutions
refractive index ✔️✔️Ratio of the speed of light in free space to its speed in a given material
infrared light ✔️✔️Light extending from 680 nm up to the wavelengths of the microwaves
optical spectrum ✔️✔️Light frequencies from the infrared on up
cladding ✔️✔️Material surrounding the core, which must have a lower index of refraction to
keep the light in the core
numerical aperture ✔️✔️A measure of a fiber's ability to accept light
multimode fiber ✔️✔️A fiber that supports many optical waveguide modes
pulse dispersion ✔️✔️Stretching of received pulse width because of multiple paths taken by
the light. Limits distance and rate of data transmission
graded-index fiber ✔️✔️Fiber type where the index of refraction is gradually varied with a
parabolic profile. Provides longer lengths and higher bandwidths
,single-mode fiber ✔️✔️Fiber cables with core diameters of about 7-10 µm; light follows a
single path
scattering ✔️✔️Caused by refractive index fluctuations; accounts for 96 percent of attenuation
loss
absorption ✔️✔️Light interaction with the atomic structure of the fiber material; also involves
the conversion of optical power to heat
macrobending ✔️✔️Loss due to light breaking up and escaping into the cladding
microbending ✔️✔️Loss caused by very small mechanical deflections and stress on the fiber
dispersion ✔️✔️Broadening of a light pulse as it propagates through a fiber strand
dense wavelength division multiplexing (DWDM) ✔️✔️Incorporates the propagation of
several wavelengths in the 1550 nm range for a single fiber
isolator ✔️✔️An inline passive device that allows optical power to flow only in one direction
attenuator ✔️✔️Used to reduce the received signal level (RSL)
,mechanical splice ✔️✔️Two fibers joined together with an air gap, requires an index-matching
gel to provide a good splice
Fiber cross-connect ✔️✔️Optical patch panel used to interconnect fiber cables
Backbone ✔️✔️Main fiber distribution
Basic Service Set (BSS) ✔️✔️Term used to describe an independent network; fundamental
topology of WLAN
ad hoc ✔️✔️Another term used to describe an independent network
transceiver ✔️✔️A transmit/receive unit
Extended Service Set (ESS) ✔️✔️The use of multiple access points to extend user mobility
hand-off ✔️✔️When the user's computer establishes an association with another access point
with a stronger signal
Roaming ✔️✔️Term describing the ability to maintain network connectivity while moving
, CSMA/CA ✔️✔️Carrier sense multiple access/collision avoidance. Used in 802.11
direct sequence spread spectrum (DSSS) ✔️✔️A technique used in 802.11 to spread
transmitted data over a wide bandwidth
frequency hopping spread spectrum (FHSS) ✔️✔️A technique used in 802.11 where the
transmit signal frequency changes based on a pseudorandom sequence
hopping sequence ✔️✔️The name for the specific order of frequency changes used in FHSS
orthogonal frequency division multiplexing (OFDM) ✔️✔️Technique used in 802.11 that
divides the signal bandwidth into smaller subchannels over which data is transmitted in parallel
MIMO ✔️✔️A space-division multiplexing technique where the data stream is split into
multiple parts called spatial streams
Multiuser MIMO (MUMIMO) ✔️✔️Use of MIMO technology with eight spatial streams
Beamforming ✔️✔️A technique used to direct transmission of the radio signal to a specific
device
