NCTI PROGRESSION FIELD TECH 5-6 |
NATIONAL CABLE TELEVISION INSTITUTE |
ACADEMIC YEAR 2026/2027 QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF
Core Domains
• DOCSIS Network Architecture and CMTS Operations
• HFC Plant Components and Signal Flow
• IP Addressing, Subnetting, and Network Protocols
• VoIP/PacketCable and Business Telephony Services
• RF Signal Measurement and Troubleshooting
• Wi-Fi Networking and Wireless Technologies
• Commercial Property Installation and Service
• Network Troubleshooting Methodology and Diagnostic Tools
Introduction
The NCTI Progression Field Technician 5-6 examination assesses advanced
knowledge and competency required for cable telecommunications field
technicians operating in modern HFC, DOCSIS, and business service
environments. This assessment evaluates understanding of cable modem
termination systems, RF signal management, IP networking fundamentals,
commercial VoIP deployment, and wireless technologies. The multiple-choice
,and scenario-based structure emphasizes practical field application and
diagnostic decision-making in real-world broadband network operations.
Candidates must demonstrate proficiency in DOCSIS operations, signal
troubleshooting, network protocol analysis, and commercial service
installation.
SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary purpose of a Cable Modem Termination System (CMTS)
in a DOCSIS network?
A. To provide power to the HFC plant
B. To manage cable modems and route data between the HFC network and
the core IP network
C. To convert analog video signals to digital format
D. To provide Wi-Fi connectivity to residential subscribers
Correct answer: B
RATIONALE: The CMTS is the headend device that provides the interface
between cable modem subscribers and the ISP's backbone. It handles
modulation, demodulation, scheduling, and routing functions .
Question 2
Which frequency range is typically used for upstream DOCSIS transmissions?
A. 5 MHz to 42 MHz
B. 54 MHz to 550 MHz
C. 550 MHz to 750 MHz
D. 750 MHz to 1 GHz
Correct answer: A
, RATIONALE: The upstream (return path) occupies the lower frequencies
of the coaxial spectrum, traditionally 5–42 MHz. DOCSIS 3.1 extends this to
5–85 MHz to support higher upstream throughput .
Question 3
What is the network address of the subnet that contains the host
192.168.10.130/26?
A. 192.168.10.0
B. 192.168.10.64
C. 192.168.10.128
D. 192.168.10.192
Correct answer: C
RATIONALE: A /26 mask (255.255.255.192) divides the last octet into four
subnets of 64 addresses each. The host 130 falls within the subnet starting at
128 (128–191). The network address is 192.168.10.128 .
Question 4
How many usable host addresses are available in a subnet with a /27 mask?
A. 14
B. 30
C. 32
D. 62
Correct answer: B
RATIONALE: A /27 mask leaves 5 host bits (32 − 27 = 5). 2^5 = 32 total
addresses, minus 2 for the network and broadcast addresses, equals 30 usable
hosts .
Question 5
Which private IP address range is defined in RFC 1918 for Class B networks?
, A. 10.0.0.0 – 10.255.255.255
B. 172.16.0.0 – 172.31.255.255
C. 192.168.0.0 – 192.168.255.255
D. 127.0.0.0 – 127.255.255.255
Correct answer: B
RATIONALE: RFC 1918 reserves three blocks for private use: 10.0.0.0/8
(Class A), 172.16.0.0/12 (Class B), and 192.168.0.0/16 (Class C) .
Question 6
What is the broadcast address for the subnet 10.20.30.0/24?
A. 10.20.30.0
B. 10.20.30.1
C. 10.20.30.255
D. 10.20.255.255
Correct answer: C
RATIONALE: In a /24 subnet, the last octet is the host portion. The
broadcast address is obtained by setting all host bits to 1, yielding .255 .
Question 7
What is the function of a diplex filter in an HFC network?
A. To amplify the downstream signal
B. To separate the upstream and downstream frequency bands
C. To convert optical signals to RF signals
D. To provide power to the coaxial cable
Correct answer: B
RATIONALE: Diplex filters allow the downstream (high-frequency) and
upstream (low-frequency) signals to share the same coaxial cable without
interference by directing each band to the appropriate path .
Question 8
NATIONAL CABLE TELEVISION INSTITUTE |
ACADEMIC YEAR 2026/2027 QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF
Core Domains
• DOCSIS Network Architecture and CMTS Operations
• HFC Plant Components and Signal Flow
• IP Addressing, Subnetting, and Network Protocols
• VoIP/PacketCable and Business Telephony Services
• RF Signal Measurement and Troubleshooting
• Wi-Fi Networking and Wireless Technologies
• Commercial Property Installation and Service
• Network Troubleshooting Methodology and Diagnostic Tools
Introduction
The NCTI Progression Field Technician 5-6 examination assesses advanced
knowledge and competency required for cable telecommunications field
technicians operating in modern HFC, DOCSIS, and business service
environments. This assessment evaluates understanding of cable modem
termination systems, RF signal management, IP networking fundamentals,
commercial VoIP deployment, and wireless technologies. The multiple-choice
,and scenario-based structure emphasizes practical field application and
diagnostic decision-making in real-world broadband network operations.
Candidates must demonstrate proficiency in DOCSIS operations, signal
troubleshooting, network protocol analysis, and commercial service
installation.
SECTION ONE: QUESTIONS 1–100
Question 1
What is the primary purpose of a Cable Modem Termination System (CMTS)
in a DOCSIS network?
A. To provide power to the HFC plant
B. To manage cable modems and route data between the HFC network and
the core IP network
C. To convert analog video signals to digital format
D. To provide Wi-Fi connectivity to residential subscribers
Correct answer: B
RATIONALE: The CMTS is the headend device that provides the interface
between cable modem subscribers and the ISP's backbone. It handles
modulation, demodulation, scheduling, and routing functions .
Question 2
Which frequency range is typically used for upstream DOCSIS transmissions?
A. 5 MHz to 42 MHz
B. 54 MHz to 550 MHz
C. 550 MHz to 750 MHz
D. 750 MHz to 1 GHz
Correct answer: A
, RATIONALE: The upstream (return path) occupies the lower frequencies
of the coaxial spectrum, traditionally 5–42 MHz. DOCSIS 3.1 extends this to
5–85 MHz to support higher upstream throughput .
Question 3
What is the network address of the subnet that contains the host
192.168.10.130/26?
A. 192.168.10.0
B. 192.168.10.64
C. 192.168.10.128
D. 192.168.10.192
Correct answer: C
RATIONALE: A /26 mask (255.255.255.192) divides the last octet into four
subnets of 64 addresses each. The host 130 falls within the subnet starting at
128 (128–191). The network address is 192.168.10.128 .
Question 4
How many usable host addresses are available in a subnet with a /27 mask?
A. 14
B. 30
C. 32
D. 62
Correct answer: B
RATIONALE: A /27 mask leaves 5 host bits (32 − 27 = 5). 2^5 = 32 total
addresses, minus 2 for the network and broadcast addresses, equals 30 usable
hosts .
Question 5
Which private IP address range is defined in RFC 1918 for Class B networks?
, A. 10.0.0.0 – 10.255.255.255
B. 172.16.0.0 – 172.31.255.255
C. 192.168.0.0 – 192.168.255.255
D. 127.0.0.0 – 127.255.255.255
Correct answer: B
RATIONALE: RFC 1918 reserves three blocks for private use: 10.0.0.0/8
(Class A), 172.16.0.0/12 (Class B), and 192.168.0.0/16 (Class C) .
Question 6
What is the broadcast address for the subnet 10.20.30.0/24?
A. 10.20.30.0
B. 10.20.30.1
C. 10.20.30.255
D. 10.20.255.255
Correct answer: C
RATIONALE: In a /24 subnet, the last octet is the host portion. The
broadcast address is obtained by setting all host bits to 1, yielding .255 .
Question 7
What is the function of a diplex filter in an HFC network?
A. To amplify the downstream signal
B. To separate the upstream and downstream frequency bands
C. To convert optical signals to RF signals
D. To provide power to the coaxial cable
Correct answer: B
RATIONALE: Diplex filters allow the downstream (high-frequency) and
upstream (low-frequency) signals to share the same coaxial cable without
interference by directing each band to the appropriate path .
Question 8
