NCTI FINAL EXAM PROGRESSION :FIELD TECH 2-3 TEST NEWEST
2024/2025 ACTUAL COMPLETE 200 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES|AGRADE
What are two features that were added in Data Over Cable Service
Interface Specification (DOCSIS) 3.1 to extend
the viability of hybrid fiber/coax (HFC) networks into the next
decade? - ANSWER-Orthogonal frequency division
multiplexing (OFDM) and low-
density parity-check (LDPC).
How does Internet protocol (IP) multicast differ from IP broadcast?
- ANSWER-IP multicast traffic is only sent to
specific modem addresses on the network; IP broadcast
traffic is sent to all modems on the network.
What is a consideration when mounting a high-gain omnidirectional
antenna indoors on the ceiling? - ANSWER-If the
ceiling is too high, the coverage area might not reach
the floor where the users are located.
As a general rule, how does an increase in effective isotropic radiated
power (EIRP) relate to the link budget range? -
,ANSWER-Each 6 decibels (dB) increase in EIRP
equates to a doubling of range.
What happens when an active Ethernet switch fails to sense a
power over Ethernet (PoE) device on a port? -
ANSWER-It switches off the direct
current (DC) voltage on that port.
Which statement describes a passive injector? - ANSWER-It places
direct current (DC) voltage onto a CAT-5e cable.
What power over Ethernet (PoE) device picks off the direct current
(DC) voltage that has been injected into the CAT-
5e cable by the injector and makes it available to the equipment
through the regular DC power jack? - ANSWER-A
DC picker
or tap.
What device would a wireless local area network (WLAN)
administrator install between the access point (AP) or bridge and the
network to give indoor local area network (LAN) users as much
bandwidth as possible? - ANSWER-A bandwidth control unit (BCU).
Polarization is defined as which one of the following? - ANSWER-
orientation of an electromagnetic wave's electric
,field in relationship to the
Earth's surface or plane.
What is the typical coverage pattern of a semidirectional antenna? -
ANSWER-A hemispherical or cylindrical pattern.
What antenna type is ideal for making a point-to-point (P2P) network
connection between two office buildings that are
across the street from one another? -
ANSWER-A semidirectional antenna.
Which step in the troubleshooting process requires a discussion
with the customer to gather more detail about the
problem? - ANSWER-Step 1:
Identify the problem.
When analyzing a problem, what can the technician learn by asking
the customer to show or demonstrate the problem? - ANSWER-The
symptoms of the problem can be viewed and any unusual screens or
customer entries can be identified.
When using a digital signal analyzer to troubleshoot data throughput
in the Data Over Cable Service Interface Specification (DOCSIS)
network, what is the minimum modulation error ratio (MER) into the
cable modem for a 256- quadrature amplitude modulation (QAM)
carrier? - ANSWER-32 dB or greater.
What uses the 2.4-GHz band and runs at 54 Mbps? - ANSWER-802.11g
, What is one reason why broadband cable operators install fiber-optic
cable in stages instead of changing the infrastructure all at once? -
ANSWER-Changing the infrastructure all at once would cause too
many service disruptions.
What is the difference between the fiber-to-the-node (FTTN) and fiber-
to-the-curb (FTTC) topologies? - ANSWER-An
FTTC is allowed a smaller number of RF amplifiers between the
optical fiber and the customer premises.
Which of these components is used in a passive optical network
(PON)? - ANSWER-Optical splitters.
Which type of star topology used in a passive optical network
(PON) places the PON splitters into fiber access
terminal (FAT) located deep in the network and closer to the
customer premises than the centralized split? -
ANSWER-
Distributed
star.
Which element of a passive optical network (PON) uses a Bragg
grating filter? - ANSWER-Optical line terminal
(OLT).
2024/2025 ACTUAL COMPLETE 200 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES|AGRADE
What are two features that were added in Data Over Cable Service
Interface Specification (DOCSIS) 3.1 to extend
the viability of hybrid fiber/coax (HFC) networks into the next
decade? - ANSWER-Orthogonal frequency division
multiplexing (OFDM) and low-
density parity-check (LDPC).
How does Internet protocol (IP) multicast differ from IP broadcast?
- ANSWER-IP multicast traffic is only sent to
specific modem addresses on the network; IP broadcast
traffic is sent to all modems on the network.
What is a consideration when mounting a high-gain omnidirectional
antenna indoors on the ceiling? - ANSWER-If the
ceiling is too high, the coverage area might not reach
the floor where the users are located.
As a general rule, how does an increase in effective isotropic radiated
power (EIRP) relate to the link budget range? -
,ANSWER-Each 6 decibels (dB) increase in EIRP
equates to a doubling of range.
What happens when an active Ethernet switch fails to sense a
power over Ethernet (PoE) device on a port? -
ANSWER-It switches off the direct
current (DC) voltage on that port.
Which statement describes a passive injector? - ANSWER-It places
direct current (DC) voltage onto a CAT-5e cable.
What power over Ethernet (PoE) device picks off the direct current
(DC) voltage that has been injected into the CAT-
5e cable by the injector and makes it available to the equipment
through the regular DC power jack? - ANSWER-A
DC picker
or tap.
What device would a wireless local area network (WLAN)
administrator install between the access point (AP) or bridge and the
network to give indoor local area network (LAN) users as much
bandwidth as possible? - ANSWER-A bandwidth control unit (BCU).
Polarization is defined as which one of the following? - ANSWER-
orientation of an electromagnetic wave's electric
,field in relationship to the
Earth's surface or plane.
What is the typical coverage pattern of a semidirectional antenna? -
ANSWER-A hemispherical or cylindrical pattern.
What antenna type is ideal for making a point-to-point (P2P) network
connection between two office buildings that are
across the street from one another? -
ANSWER-A semidirectional antenna.
Which step in the troubleshooting process requires a discussion
with the customer to gather more detail about the
problem? - ANSWER-Step 1:
Identify the problem.
When analyzing a problem, what can the technician learn by asking
the customer to show or demonstrate the problem? - ANSWER-The
symptoms of the problem can be viewed and any unusual screens or
customer entries can be identified.
When using a digital signal analyzer to troubleshoot data throughput
in the Data Over Cable Service Interface Specification (DOCSIS)
network, what is the minimum modulation error ratio (MER) into the
cable modem for a 256- quadrature amplitude modulation (QAM)
carrier? - ANSWER-32 dB or greater.
What uses the 2.4-GHz band and runs at 54 Mbps? - ANSWER-802.11g
, What is one reason why broadband cable operators install fiber-optic
cable in stages instead of changing the infrastructure all at once? -
ANSWER-Changing the infrastructure all at once would cause too
many service disruptions.
What is the difference between the fiber-to-the-node (FTTN) and fiber-
to-the-curb (FTTC) topologies? - ANSWER-An
FTTC is allowed a smaller number of RF amplifiers between the
optical fiber and the customer premises.
Which of these components is used in a passive optical network
(PON)? - ANSWER-Optical splitters.
Which type of star topology used in a passive optical network
(PON) places the PON splitters into fiber access
terminal (FAT) located deep in the network and closer to the
customer premises than the centralized split? -
ANSWER-
Distributed
star.
Which element of a passive optical network (PON) uses a Bragg
grating filter? - ANSWER-Optical line terminal
(OLT).
