NCTI -High-Speed Data Customer Service
Conventional Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
The first version of the Data Over The International Telecommunication
Cable Service Interface Union (ITU).
Specification (DOCSIS) was
approved as an international
standard by what organization?
What criteria does the Data Over Compliance with the DOCSIS standard
Cable Service Interface and
Specification (DOCSIS) interoperability between suppliers.
certification
process ensure?
What layers of the Open Systems Layers 1 through 4 (Physical layer, Data
Interconnection (OSI) reference Link Layer,
model are applied between Data Network Layer, and Transport Layer) are
Over Cable Service Interface applied
Specification (DOCSIS) modems between the DOCSIS modem and CMTS.
and
the cable modem termination
system
(CMTS)?
,What access technology does the Time division multiple access (TDMA).
first version of the Data Over
Cable
Service Interface Specification
(DOCSIS 1.0) use to send data
upstream over the network's RF
return path?
What was added to the first Data Quality of service (QoS) controls,
Over Cable Service Interface enhanced
Specification (DOCSIS) that security, and adaptive equalization in the
enabled upstream
broadband cable operators to path.
provide telephone service with
quality and reliability that rivaled
the
products of the traditional
telephone
companies?
What features were introduced Orthogonal frequency division multiplexing
with (OFDM) and low-density parity-check
the 3.1 version of the Data Over (LDPC).
Cable Service Interface
Specification (DOCSIS 3.1) to
increase the downstream and
upstream data throughput?
, Which Data Over Cable Service DOCSIS 3.0.
Interface Specification (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?
Why are the data throughput rates Because the narrower bandwidths and
for both downstream and lower
upstream orders of modulation for the return path
in Data Over Cable Service carriers
Interface cause the DOCSIS downstream and
Specification (DOCSIS) networks upstream data
asymmetrical? rates to be unequal or asymmetrical.
Which Open Systems The Physical and Data Link Layers.
Interconnection (OSI) reference
model layers does the MAC Layer
in
the Data Over Cable Service
Interface Specification (DOCSIS)
overlap?
Conventional Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
The first version of the Data Over The International Telecommunication
Cable Service Interface Union (ITU).
Specification (DOCSIS) was
approved as an international
standard by what organization?
What criteria does the Data Over Compliance with the DOCSIS standard
Cable Service Interface and
Specification (DOCSIS) interoperability between suppliers.
certification
process ensure?
What layers of the Open Systems Layers 1 through 4 (Physical layer, Data
Interconnection (OSI) reference Link Layer,
model are applied between Data Network Layer, and Transport Layer) are
Over Cable Service Interface applied
Specification (DOCSIS) modems between the DOCSIS modem and CMTS.
and
the cable modem termination
system
(CMTS)?
,What access technology does the Time division multiple access (TDMA).
first version of the Data Over
Cable
Service Interface Specification
(DOCSIS 1.0) use to send data
upstream over the network's RF
return path?
What was added to the first Data Quality of service (QoS) controls,
Over Cable Service Interface enhanced
Specification (DOCSIS) that security, and adaptive equalization in the
enabled upstream
broadband cable operators to path.
provide telephone service with
quality and reliability that rivaled
the
products of the traditional
telephone
companies?
What features were introduced Orthogonal frequency division multiplexing
with (OFDM) and low-density parity-check
the 3.1 version of the Data Over (LDPC).
Cable Service Interface
Specification (DOCSIS 3.1) to
increase the downstream and
upstream data throughput?
, Which Data Over Cable Service DOCSIS 3.0.
Interface Specification (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?
Why are the data throughput rates Because the narrower bandwidths and
for both downstream and lower
upstream orders of modulation for the return path
in Data Over Cable Service carriers
Interface cause the DOCSIS downstream and
Specification (DOCSIS) networks upstream data
asymmetrical? rates to be unequal or asymmetrical.
Which Open Systems The Physical and Data Link Layers.
Interconnection (OSI) reference
model layers does the MAC Layer
in
the Data Over Cable Service
Interface Specification (DOCSIS)
overlap?
