NCTI High-Speed Data Customer Service
Conventional Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
Chapter 2 Docsis Modem
Operation
Exam
What messages must a cable An upstream channel descriptor (UCD)
modem message, a
receive from the downstream symbol timing message (SYNC), and a
signal bandwidth
in order to begin a transmitting allocation message (MAP).
relationship with the cable modem
termination system (CMTS)?
What instructions might a cable An adjustment to the modem's timing
modem termination system interval,
(CMTS) transmit frequency, or power level.
send in a ranging response (RNG-
RSP) message to modify the cable
modem's transmission
parameters?
Why would a cable operator To enable the cable operator to define
consider activating device class special
identification (DCI) as part of a modem classes or service levels that can
DOCSIS modem's initialization? be
prioritized for ranging after a massive
outage.
, What does a DOCSIS 3.1 seek An orthogonal frequency division
first multiplexing
when synchronizing with the cable (OFDM) channel that contains a set of
modem termination system contiguous
(CMTS) subcarriers called the PHY link channel
in order to receive operational (PLC).
information?
What information does a DOCSIS The modem's downstream service group
3.1 (DS-SG),
modem provide in its Bonded if determined.
Initial
Ranging Request
(B-INIT-RNG-REQ)
message to the cable modem
termination system (CMTS)?
What Internet protocol (IP) IPv4 only, IPv6 only, alternate provisioning
connectivity modes are supported mode
in (APM), and dual-stack provisioning mode
DOCSIS 3.0 and 3.1? (DPM).
What happens if a DOCSIS The modem proceeds to an operational
modem is state and
unable to acquire the current time issues at least one ToD request per
and date from one or more 5-minute
time-of- period for each server specified until local
day (ToD) servers during time is
registration established.
with the cable modem termination
system (CMTS)?
Conventional Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
Chapter 2 Docsis Modem
Operation
Exam
What messages must a cable An upstream channel descriptor (UCD)
modem message, a
receive from the downstream symbol timing message (SYNC), and a
signal bandwidth
in order to begin a transmitting allocation message (MAP).
relationship with the cable modem
termination system (CMTS)?
What instructions might a cable An adjustment to the modem's timing
modem termination system interval,
(CMTS) transmit frequency, or power level.
send in a ranging response (RNG-
RSP) message to modify the cable
modem's transmission
parameters?
Why would a cable operator To enable the cable operator to define
consider activating device class special
identification (DCI) as part of a modem classes or service levels that can
DOCSIS modem's initialization? be
prioritized for ranging after a massive
outage.
, What does a DOCSIS 3.1 seek An orthogonal frequency division
first multiplexing
when synchronizing with the cable (OFDM) channel that contains a set of
modem termination system contiguous
(CMTS) subcarriers called the PHY link channel
in order to receive operational (PLC).
information?
What information does a DOCSIS The modem's downstream service group
3.1 (DS-SG),
modem provide in its Bonded if determined.
Initial
Ranging Request
(B-INIT-RNG-REQ)
message to the cable modem
termination system (CMTS)?
What Internet protocol (IP) IPv4 only, IPv6 only, alternate provisioning
connectivity modes are supported mode
in (APM), and dual-stack provisioning mode
DOCSIS 3.0 and 3.1? (DPM).
What happens if a DOCSIS The modem proceeds to an operational
modem is state and
unable to acquire the current time issues at least one ToD request per
and date from one or more 5-minute
time-of- period for each server specified until local
day (ToD) servers during time is
registration established.
with the cable modem termination
system (CMTS)?
