NCTI -HSD FINAL-DOJ 2 EXAM NEWEST 2025
ACTUAL EXAM COMPLETE 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
The first version of the Data Over Cable Service Interface Specification (DOCSIS) was
approved as an international standard by what organization? - ✔✔ANSW✔✔The
International Telecommunication Union (ITU).
What criteria does the Data Over Cable Service Interface Specification (DOCSIS)
certification process ensure? - ✔✔ANSW✔✔Compliance with the DOCSIS standard
and interoperability between suppliers.
What layers of the Open Systems Interconnection (OSI) reference model are applied
between Data Over Cable Service Interface Specification (DOCSIS) modems and the
cable modem termination system (CMTS)? - ✔✔ANSW✔✔Layers 1 through 4 (Physical
layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the
DOCSIS modem and CMTS.
What access technology does the 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? - ✔✔ANSW✔✔Time division multiple access (TDMA).
What was added to the first Data Over Cable Service Interface Specification (DOCSIS)
that enabled broadband cable operators to provide telephone service with quality and
reliability that rivaled the products of the traditional telephone companies? -
✔✔ANSW✔✔Quality of service (QoS) controls, enhanced security, and adaptive
equalization in the upstream path.
What features were introduced with the 3.1 version of the Data Over Cable Service
Interface Specification (DOCSIS 3.1) to increase the downstream and upstream data
throughput? - ✔✔ANSW✔✔Orthogonal frequency division multiplexing (OFDM) and
low-density parity-check (LDPC).
Which Data Over Cable Service 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? - ✔✔ANSW✔✔DOCSIS 3.0.
Why are the data throughput rates for both downstream and upstream in Data Over
Cable Service Interface Specification (DOCSIS) networks asymmetrical? -
, ✔✔ANSW✔✔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 Open Systems Interconnection (OSI) reference model layers does the MAC
Layer in the Data Over Cable Service Interface Specification (DOCSIS) overlap? -
✔✔ANSW✔✔The Physical and Data Link Layers.
From where do Data Over Cable Service Interface Specification (DOCSIS) modems
receive their configuration files, billing system messages, and access control
messages? - ✔✔ANSW✔✔From the cable modem termination system (CMTS) acting
as a "proxy" or messenger that transfers messages and files between the modems and
the respective servers.
What messages must a cable modem receive from the downstream signal in order to
begin a transmitting relationship with the cable modem termination system (CMTS)? -
✔✔ANSW✔✔An upstream channel descriptor (UCD) message, a symbol timing
message (SYNC), and a bandwidth allocation message (MAP).
What instructions might a cable modem termination system (CMTS) send in a RNG-
RSP message to modify the modem's transmission parameters? - ✔✔ANSW✔✔An
adjustment to the modem's timing interval, transmit frequency, or power level
Why would a cable operator consider activating device class identification (DCI) as part
of a DOCSIS modem's initialization? - ✔✔ANSW✔✔To enable the cable operator to
define special modem classes or service levels that can be prioritized for ranging after a
massive outage.
What does a DOCSIS 3.1 seek first when synchronizing with the cable modem
termination system (CMTS) in order to receive operational information? -
✔✔ANSW✔✔An orthogonal frequency division multiplexing (OFDM) channel that
contains a set of contiguous subcarriers called the PHY link channel (PLC).
What information does a DOCSIS 3.1 modem provide in its Bonded Initial Ranging
Request (B-INIT-RNG-REQ) message to the cable modem termination system
(CMTS)? - ✔✔ANSW✔✔The modem's downstream service group (DS-SG) if
determined.
What Internet protocol (IP) connectivity modes are supported in DOCSIS 3.0 and 3.1? -
✔✔ANSW✔✔IPv4 only, IPv6 only, alternate provisioning mode (APM), and dual-stack
provisioning mode (DPM).
What happens if a DOCSIS modem is unable to acquire the current time and date from
one or more time-of-day (ToD) servers during registration with the cable modem
termination system (CMTS)? - ✔✔ANSW✔✔The modem proceeds to an operational
ACTUAL EXAM COMPLETE 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
The first version of the Data Over Cable Service Interface Specification (DOCSIS) was
approved as an international standard by what organization? - ✔✔ANSW✔✔The
International Telecommunication Union (ITU).
What criteria does the Data Over Cable Service Interface Specification (DOCSIS)
certification process ensure? - ✔✔ANSW✔✔Compliance with the DOCSIS standard
and interoperability between suppliers.
What layers of the Open Systems Interconnection (OSI) reference model are applied
between Data Over Cable Service Interface Specification (DOCSIS) modems and the
cable modem termination system (CMTS)? - ✔✔ANSW✔✔Layers 1 through 4 (Physical
layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the
DOCSIS modem and CMTS.
What access technology does the 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? - ✔✔ANSW✔✔Time division multiple access (TDMA).
What was added to the first Data Over Cable Service Interface Specification (DOCSIS)
that enabled broadband cable operators to provide telephone service with quality and
reliability that rivaled the products of the traditional telephone companies? -
✔✔ANSW✔✔Quality of service (QoS) controls, enhanced security, and adaptive
equalization in the upstream path.
What features were introduced with the 3.1 version of the Data Over Cable Service
Interface Specification (DOCSIS 3.1) to increase the downstream and upstream data
throughput? - ✔✔ANSW✔✔Orthogonal frequency division multiplexing (OFDM) and
low-density parity-check (LDPC).
Which Data Over Cable Service 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? - ✔✔ANSW✔✔DOCSIS 3.0.
Why are the data throughput rates for both downstream and upstream in Data Over
Cable Service Interface Specification (DOCSIS) networks asymmetrical? -
, ✔✔ANSW✔✔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 Open Systems Interconnection (OSI) reference model layers does the MAC
Layer in the Data Over Cable Service Interface Specification (DOCSIS) overlap? -
✔✔ANSW✔✔The Physical and Data Link Layers.
From where do Data Over Cable Service Interface Specification (DOCSIS) modems
receive their configuration files, billing system messages, and access control
messages? - ✔✔ANSW✔✔From the cable modem termination system (CMTS) acting
as a "proxy" or messenger that transfers messages and files between the modems and
the respective servers.
What messages must a cable modem receive from the downstream signal in order to
begin a transmitting relationship with the cable modem termination system (CMTS)? -
✔✔ANSW✔✔An upstream channel descriptor (UCD) message, a symbol timing
message (SYNC), and a bandwidth allocation message (MAP).
What instructions might a cable modem termination system (CMTS) send in a RNG-
RSP message to modify the modem's transmission parameters? - ✔✔ANSW✔✔An
adjustment to the modem's timing interval, transmit frequency, or power level
Why would a cable operator consider activating device class identification (DCI) as part
of a DOCSIS modem's initialization? - ✔✔ANSW✔✔To enable the cable operator to
define special modem classes or service levels that can be prioritized for ranging after a
massive outage.
What does a DOCSIS 3.1 seek first when synchronizing with the cable modem
termination system (CMTS) in order to receive operational information? -
✔✔ANSW✔✔An orthogonal frequency division multiplexing (OFDM) channel that
contains a set of contiguous subcarriers called the PHY link channel (PLC).
What information does a DOCSIS 3.1 modem provide in its Bonded Initial Ranging
Request (B-INIT-RNG-REQ) message to the cable modem termination system
(CMTS)? - ✔✔ANSW✔✔The modem's downstream service group (DS-SG) if
determined.
What Internet protocol (IP) connectivity modes are supported in DOCSIS 3.0 and 3.1? -
✔✔ANSW✔✔IPv4 only, IPv6 only, alternate provisioning mode (APM), and dual-stack
provisioning mode (DPM).
What happens if a DOCSIS modem is unable to acquire the current time and date from
one or more time-of-day (ToD) servers during registration with the cable modem
termination system (CMTS)? - ✔✔ANSW✔✔The modem proceeds to an operational
