NCTI -HSD FINAL-DOJ 2 EXAM NEWEST 2025 ACTUAL EXAM COMPLETE 100 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
NCTI -
1. The first version of the Data Over Cable Service Interface Specification (DOCSIS) was approved
HSD
as an international standard by what organization? - (ANSWER)The International
FINAL-
Telecommunication Union (ITU).
DOJ 2
EXAM
NEWEST
2. What criteria does the Data Over Cable Service Interface Specification (DOCSIS) certification
2025
process ensure? - (ANSWER)Compliance with the DOCSIS standard and interoperability
between suppliers. ACTUAL
EXAM
COMPLE
3. What layers of the Open Systems Interconnection (OSI) reference model are applied between TE 100
Data Over Cable Service Interface Specification (DOCSIS) modems and the cable modem QUESTIO
termination system (CMTS)? - (ANSWER)Layers 1 through 4 (Physical layer, Data Link Layer, NS AND
Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS. CORREC
DETAILE
D
4. What access technology does the first version of the Data Over Cable Service Interface ANSWE
Specification (DOCSIS 1.0) use to send data upstream over the network's RF return path? - S
(ANSWER)Time division multiple access (TDMA). (VERIFIE
D
ANSWE
5. What was added to the first Data Over Cable Service Interface Specification (DOCSIS) that S)
enabled broadband cable operators to provide telephone service with quality and reliability that
rivaled the products of the traditional telephone companies? - (ANSWER)Quality of service
(QoS) controls, enhanced security, and adaptive equalization in the upstream path.
6. 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? -
(ANSWER)Orthogonal frequency division multiplexing (OFDM) and low-density parity-check 《
(LDPC). 主
啊
，
7. Which Data Over Cable Service Interface Specification (DOCSIS) version was the first to
我
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 心
versions? - (ANSWER)DOCSIS 3.0. 愿
归
向
8. Why are the data throughput rates for both downstream and upstream in Data Over Cable Service
Interface Specification (DOCSIS) networks asymmetrical? - (ANSWER)Because the narrower 你
bandwidths and lower orders of modulation for the return path carriers cause the DOCSIS
downstream and upstream data rates to be unequal or asymmetrical.
, NCTI -HSD FINAL-DOJ 2 EXAM NEWEST 2025 ACTUAL EXAM COMPLETE 100 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
NCTI -
9. Which Open Systems Interconnection (OSI) reference model layers does the MAC Layer in the
HSD
Data Over Cable Service Interface Specification (DOCSIS) overlap? - (ANSWER)The Physical
FINAL-
and Data Link Layers.
DOJ 2
EXAM
NEWEST
10. From where do Data Over Cable Service Interface Specification (DOCSIS) modems receive their
2025
configuration files, billing system messages, and access control messages? - (ANSWER)From the
cable modem termination system (CMTS) acting as a "proxy" or messenger that transfers ACTUAL
messages and files between the modems and the respective servers. EXAM
COMPLE
TE 100
11. What messages must a cable modem receive from the downstream signal in order to begin a QUESTIO
transmitting relationship with the cable modem termination system (CMTS)? - (ANSWER)An NS AND
upstream channel descriptor (UCD) message, a symbol timing message (SYNC), and a bandwidth CORREC
allocation message (MAP). DETAILE
D
ANSWE
12. What instructions might a cable modem termination system (CMTS) send in a RNG-RSP S
message to modify the modem's transmission parameters? - (ANSWER)An adjustment to the (VERIFIE
modem's timing interval, transmit frequency, or power level D
ANSWE
S)
13. Why would a cable operator consider activating device class identification (DCI) as part of a
DOCSIS modem's initialization? - (ANSWER)To enable the cable operator to define special
modem classes or service levels that can be prioritized for ranging after a massive outage.
14. What does a DOCSIS 3.1 seek first when synchronizing with the cable modem termination
system (CMTS) in order to receive operational information? - (ANSWER)An orthogonal
frequency division multiplexing (OFDM) channel that contains a set of contiguous subcarriers 《
called the PHY link channel (PLC). 主
啊
，
15. What information does a DOCSIS 3.1 modem provide in its Bonded Initial Ranging Request (B-
我
INIT-RNG-REQ) message to the cable modem termination system (CMTS)? - (ANSWER)The
modem's downstream service group (DS-SG) if determined. 心
愿
归
16. What Internet protocol (IP) connectivity modes are supported in DOCSIS 3.0 and 3.1? -
向
(ANSWER)IPv4 only, IPv6 only, alternate provisioning mode (APM), and dual-stack
provisioning mode (DPM). 你
17. 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
DETAILED ANSWERS (VERIFIED ANSWERS)
NCTI -
1. The first version of the Data Over Cable Service Interface Specification (DOCSIS) was approved
HSD
as an international standard by what organization? - (ANSWER)The International
FINAL-
Telecommunication Union (ITU).
DOJ 2
EXAM
NEWEST
2. What criteria does the Data Over Cable Service Interface Specification (DOCSIS) certification
2025
process ensure? - (ANSWER)Compliance with the DOCSIS standard and interoperability
between suppliers. ACTUAL
EXAM
COMPLE
3. What layers of the Open Systems Interconnection (OSI) reference model are applied between TE 100
Data Over Cable Service Interface Specification (DOCSIS) modems and the cable modem QUESTIO
termination system (CMTS)? - (ANSWER)Layers 1 through 4 (Physical layer, Data Link Layer, NS AND
Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS. CORREC
DETAILE
D
4. What access technology does the first version of the Data Over Cable Service Interface ANSWE
Specification (DOCSIS 1.0) use to send data upstream over the network's RF return path? - S
(ANSWER)Time division multiple access (TDMA). (VERIFIE
D
ANSWE
5. What was added to the first Data Over Cable Service Interface Specification (DOCSIS) that S)
enabled broadband cable operators to provide telephone service with quality and reliability that
rivaled the products of the traditional telephone companies? - (ANSWER)Quality of service
(QoS) controls, enhanced security, and adaptive equalization in the upstream path.
6. 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? -
(ANSWER)Orthogonal frequency division multiplexing (OFDM) and low-density parity-check 《
(LDPC). 主
啊
，
7. Which Data Over Cable Service Interface Specification (DOCSIS) version was the first to
我
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 心
versions? - (ANSWER)DOCSIS 3.0. 愿
归
向
8. Why are the data throughput rates for both downstream and upstream in Data Over Cable Service
Interface Specification (DOCSIS) networks asymmetrical? - (ANSWER)Because the narrower 你
bandwidths and lower orders of modulation for the return path carriers cause the DOCSIS
downstream and upstream data rates to be unequal or asymmetrical.
, NCTI -HSD FINAL-DOJ 2 EXAM NEWEST 2025 ACTUAL EXAM COMPLETE 100 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
NCTI -
9. Which Open Systems Interconnection (OSI) reference model layers does the MAC Layer in the
HSD
Data Over Cable Service Interface Specification (DOCSIS) overlap? - (ANSWER)The Physical
FINAL-
and Data Link Layers.
DOJ 2
EXAM
NEWEST
10. From where do Data Over Cable Service Interface Specification (DOCSIS) modems receive their
2025
configuration files, billing system messages, and access control messages? - (ANSWER)From the
cable modem termination system (CMTS) acting as a "proxy" or messenger that transfers ACTUAL
messages and files between the modems and the respective servers. EXAM
COMPLE
TE 100
11. What messages must a cable modem receive from the downstream signal in order to begin a QUESTIO
transmitting relationship with the cable modem termination system (CMTS)? - (ANSWER)An NS AND
upstream channel descriptor (UCD) message, a symbol timing message (SYNC), and a bandwidth CORREC
allocation message (MAP). DETAILE
D
ANSWE
12. What instructions might a cable modem termination system (CMTS) send in a RNG-RSP S
message to modify the modem's transmission parameters? - (ANSWER)An adjustment to the (VERIFIE
modem's timing interval, transmit frequency, or power level D
ANSWE
S)
13. Why would a cable operator consider activating device class identification (DCI) as part of a
DOCSIS modem's initialization? - (ANSWER)To enable the cable operator to define special
modem classes or service levels that can be prioritized for ranging after a massive outage.
14. What does a DOCSIS 3.1 seek first when synchronizing with the cable modem termination
system (CMTS) in order to receive operational information? - (ANSWER)An orthogonal
frequency division multiplexing (OFDM) channel that contains a set of contiguous subcarriers 《
called the PHY link channel (PLC). 主
啊
，
15. What information does a DOCSIS 3.1 modem provide in its Bonded Initial Ranging Request (B-
我
INIT-RNG-REQ) message to the cable modem termination system (CMTS)? - (ANSWER)The
modem's downstream service group (DS-SG) if determined. 心
愿
归
16. What Internet protocol (IP) connectivity modes are supported in DOCSIS 3.0 and 3.1? -
向
(ANSWER)IPv4 only, IPv6 only, alternate provisioning mode (APM), and dual-stack
provisioning mode (DPM). 你
17. 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
