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NCTI BDI Exam With 100% Correct Answers 2023
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NCTI BDI Exam With 100% CorrectAnswers 2023
What functionality is integrated in all modern signal level meters (SLM) to measure
specific parameters of a digital modulation carrier containing digital television (DTV) and
Data Over Cable Service Interface Specification (DOCSIS) signals? - Correct Answer-
Digital signal analyzer functionality
What is a risk of performing automated measurements on a sample of channels instead
of all channels? - Correct Answer-Problems in unmeasured channels may go
undetected.
Using a digital signal analyzer, what measurements are typically taken to troubleshoot
and diagnose a digital television (DTV) signal? - Correct Answer-Average power level,
modulation error ratio (MER), and bit error ratio (BER).
How do cable operators ensure that only paying customers are receiving digital
television (DTV) service? - Correct Answer-Cable operators prevent unauthorized
reception of DTV services by scrambling or encrypting the services.
Why were digital terminal adapters (DTA) originally installed in the customer premises?
- Correct Answer-Because the customer wanted service to their analog TV and
subscribed to basic-only service.
What determines the amount of content that can be stored on a digital video recorder
(DVR)? - Correct Answer-The hard drive capacity and the format of the stored content.
A cable gateway can replace which broadband cable operator supplied devices? -
Correct Answer-A cable modem and a wireless telephone base
What forced customers to choose between the integrated entertainment system
furniture cabinet and upgraded system components? - Correct Answer-Advances in
technology such as color TV, upgraded turntables, etc.
What functionality do many Blu-ray players have, besides playing back discs? - Correct
Answer-Many have built in media streaming capabilities through a wired or wireless
connection.
Entertainment cabinets with doors made of green glass block which of the following
from electronic components? - Correct Answer-Infrared (IR) Remote sensors
The first version of DOCSIS was approved as an international standard by what
organization? - Correct Answer-The International Telecommunication Union (ITU)
, What layers of the OSI model are applied between DOCSIS modems and the CMTS? -
Correct Answer-Layers 1 through 4 - Physical, Data Link, Network, and Transport
What criteria does the DOCSIS certification process ensure? - Correct Answer-
Compliance with the DOCSIS standard and interoperability between suppliers.
What access technology does the first version of the DOCSIS use to send data
upstream over the network's RF return path? - Correct Answer-Time division multiple
access (TDMA)
What was added to the first DOCSIS that enabled broadband cable operators to provide
telephone service with quality and reliability that rivaled the products of the traditional
telephone companies? - Correct Answer-Quality of Service (QoS) controls, enhanced
security, adaptive equalization in the upstream path.
What features were introduced with the 3.1 version of DOCSIS to increase the
downstream and upstream data throughput? - Correct Answer-Orthogonal frequency
division multiplexing (OFDM) and low-density parity-check (LDPC).
Which DOCSIS version was the first to provide an option for raising the top frequency of
the upstream spectrum to 85 MHz in order to create enough bandwidth for upstream
carriers from modems running on previous DOCSIS versions? - Correct Answer-
DOCSIS 3.0
Why are the data throughput rates for both downstream and upstream in DOCSIS
networks asymmetrical? - Correct Answer-Because the narrower bandwidths and lower
orders of modulation for the return path carriers cause the DOCSIS downstream and
upstream data rates to be unequal or asymmetrical.
Which OSI reference model layers does the MAC Layer in the DOCSIS overlap? -
Correct Answer-Physical and Data link layers
From where do DOCSIS modems receive their configuration files, billing system
messages, and access control messages? - Correct Answer-From the CMTS acting as
a "proxy" or messenger that transfers messages and files between the modems and the
respective servers.
If a customer already has cable television service and is adding high-speed data
service, what should be checked on the digital television channels? - Correct Answer-
Intermittent operation, which is a symptom of noise or interference in the downstream.
Installing a cable modem and router in a closet or utility room is simplified by having
what items in the room? - Correct Answer-Easy access to coax, a power outlet for the
modem and router, and a twisted-pair network cable that is tagged and has connectors
installed using standard wiring configurations.
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