REP 1- REP 2 UPDATED FINAL EXAM QUESTIONS AND
ANSWERS SURE A+
✔✔What are the three main elements of a broadband cable network? - ✔✔The
headend, the distribution network composed of coaxial cable and/or fiber optical cable,
and the drop at the customer premises.
✔✔In a broadband cable network, what group is responsible for ensuring that the
network remains in smooth running order by dispatching crews to carry out routing
system testing, preventative maintenance, and equipment servicing and replacement? -
✔✔Network operations center (NOC)
✔✔In a broadband cable network, which administrative group maintains communication
with installers, construction and maintenance technicians, and the customer service
departments? - ✔✔Dispatch
✔✔In the United States, downstream broadband radio frequency signals traveling inside
coaxial cable begins at what frequency? - ✔✔54 MHZ
✔✔What is typically used to represent computer characters or words? - ✔✔Bytes
✔✔What analog TV impairments are no longer problems in digital video? - ✔✔Ghosting
and snow
✔✔What happens as RF signals travel over cable? - ✔✔RF signal levels decrease over
distance
✔✔What type of traffic is transported over a broadband cable networks return path? -
✔✔Voice and data traffic along with communications via set top boxes and other
monitoring devices throughout the network
✔✔What are the factors that determine a conductors resistance? - ✔✔Conductor
material, diameter, length, and temperature
✔✔Over the air broadcast signals are acquired at the headend using : - ✔✔Yagi and log
periodic antennas
✔✔During the 1980's, what led to the expansion in cable system channel capacity? -
✔✔Fiber optic technology
✔✔Digital and analog signals are different in that: - ✔✔Digital networks can combine, or
multiplex, several different signals into one transmission
, ✔✔In the cable antenna relay service (CARS) - ✔✔The over the air signal is converted
to a frequency in the 12.7-13.2 ghz band
✔✔One difference between frequency modulation and amplitude modulated link
techniques in microwave signal transmission is that - ✔✔FM transmits a single channel,
and AML sends blocks of broadband channels between headends and hubs.
✔✔A satellite transponder - ✔✔Receives, amplifies, transmits (at a different frequency)
and reamplifies analog or compressed digital signals
✔✔A single beam TV receive only TVRO antenna - ✔✔Has a parabolic shape that
reflects the downlinked signal from all locations on the dish surface onto a central focal
point, which collects the reflections and provides maximum signal reception
✔✔What device in the headend seperates incoming signal into baseband video and
audio elements? - ✔✔Demodulators
✔✔Inside the headend: - ✔✔Video signals are amplitude modulated, audio signals are
frequency modulated, and color signals are amplitude modulated and phase modulated
✔✔Once signals are ready for transmission out of the headend, what is the last thing
that needs to be done to the signals? - ✔✔Multiplexed
✔✔The public switched telephone network (PTSN) used pulse code modulation (PCM)
for what function? - ✔✔Convert an analog signal (human voice) into digital signals so
that many calls can travel over the same wire.
✔✔In plain old telephone service (POTS) the ______ is a pair of wires connecting the
customer location to the telephone company - ✔✔Local circuit loop
✔✔Which of the following statements is an acurrate comparison between packet
switching and circuit switching technology? - ✔✔Packet switching uses the network only
when words are spoken, while circuit switching uses the network contstantly throughout
the entire telephone conversation
✔✔(BLANK) added to the media access control (MAC) protocol in Data Over Cable
Service Interface Specification 1.1 (DOCSIS 1.1) was a first attempt at prioritizing
Internet protocol (IP) traffic according to its application, giving priority to real-time data
packets such as streaming video over other types of packets such as email -
✔✔Service Flow
ANSWERS SURE A+
✔✔What are the three main elements of a broadband cable network? - ✔✔The
headend, the distribution network composed of coaxial cable and/or fiber optical cable,
and the drop at the customer premises.
✔✔In a broadband cable network, what group is responsible for ensuring that the
network remains in smooth running order by dispatching crews to carry out routing
system testing, preventative maintenance, and equipment servicing and replacement? -
✔✔Network operations center (NOC)
✔✔In a broadband cable network, which administrative group maintains communication
with installers, construction and maintenance technicians, and the customer service
departments? - ✔✔Dispatch
✔✔In the United States, downstream broadband radio frequency signals traveling inside
coaxial cable begins at what frequency? - ✔✔54 MHZ
✔✔What is typically used to represent computer characters or words? - ✔✔Bytes
✔✔What analog TV impairments are no longer problems in digital video? - ✔✔Ghosting
and snow
✔✔What happens as RF signals travel over cable? - ✔✔RF signal levels decrease over
distance
✔✔What type of traffic is transported over a broadband cable networks return path? -
✔✔Voice and data traffic along with communications via set top boxes and other
monitoring devices throughout the network
✔✔What are the factors that determine a conductors resistance? - ✔✔Conductor
material, diameter, length, and temperature
✔✔Over the air broadcast signals are acquired at the headend using : - ✔✔Yagi and log
periodic antennas
✔✔During the 1980's, what led to the expansion in cable system channel capacity? -
✔✔Fiber optic technology
✔✔Digital and analog signals are different in that: - ✔✔Digital networks can combine, or
multiplex, several different signals into one transmission
, ✔✔In the cable antenna relay service (CARS) - ✔✔The over the air signal is converted
to a frequency in the 12.7-13.2 ghz band
✔✔One difference between frequency modulation and amplitude modulated link
techniques in microwave signal transmission is that - ✔✔FM transmits a single channel,
and AML sends blocks of broadband channels between headends and hubs.
✔✔A satellite transponder - ✔✔Receives, amplifies, transmits (at a different frequency)
and reamplifies analog or compressed digital signals
✔✔A single beam TV receive only TVRO antenna - ✔✔Has a parabolic shape that
reflects the downlinked signal from all locations on the dish surface onto a central focal
point, which collects the reflections and provides maximum signal reception
✔✔What device in the headend seperates incoming signal into baseband video and
audio elements? - ✔✔Demodulators
✔✔Inside the headend: - ✔✔Video signals are amplitude modulated, audio signals are
frequency modulated, and color signals are amplitude modulated and phase modulated
✔✔Once signals are ready for transmission out of the headend, what is the last thing
that needs to be done to the signals? - ✔✔Multiplexed
✔✔The public switched telephone network (PTSN) used pulse code modulation (PCM)
for what function? - ✔✔Convert an analog signal (human voice) into digital signals so
that many calls can travel over the same wire.
✔✔In plain old telephone service (POTS) the ______ is a pair of wires connecting the
customer location to the telephone company - ✔✔Local circuit loop
✔✔Which of the following statements is an acurrate comparison between packet
switching and circuit switching technology? - ✔✔Packet switching uses the network only
when words are spoken, while circuit switching uses the network contstantly throughout
the entire telephone conversation
✔✔(BLANK) added to the media access control (MAC) protocol in Data Over Cable
Service Interface Specification 1.1 (DOCSIS 1.1) was a first attempt at prioritizing
Internet protocol (IP) traffic according to its application, giving priority to real-time data
packets such as streaming video over other types of packets such as email -
✔✔Service Flow
