NCTI Final Exam: Progression Field Tech 4–5 – 150
Practice Questions
1. Which concept has enabled Software as a Service (SaaS), Platform as a Service
(PaaS), and Networking as a Service (NaaS) offerings?
A) The use of fiber-optic transport exclusively
B) The separation of the transport and connectivity from the applications and services
running atop the transport
C) The adoption of IPv6 addressing
D) The implementation of DOCSIS 3.1
Answer: B
Rationale: The separation of transport/connectivity from applications and services running
atop the transport has enabled flexible service delivery models .
2. Which piece of equipment in a VoIP phone system routes a call to the public
switched telephone network (PSTN) when the receiving location is outside the
PacketCable managed IP network?
A) Router
B) Gateway
C) Switch
D) Modem
Answer: B
Rationale: The gateway down-converts digital data to analog electrical signal format and
routes the call to the PSTN .
,3. What are the three sub-network interfaces managed by PacketCable?
A) LAN, WAN, and MAN
B) Hybrid fiber/coax (HFC), managed IP, and public switched telephone network (PSTN)
C) IPv4, IPv6, and MAC
D) DOCSIS, VoIP, and PSTN
Answer: B
Rationale: PacketCable manages three sub-network interfaces: HFC, managed IP, and
PSTN .
4. Why is PacketCable VoIP a more efficient way of handling calls?
A) It uses less bandwidth than traditional telephony
B) Most cable operators have built their own IP telephone networks that use Internet
protocol rules
C) It eliminates the need for a PSTN connection
D) It uses fiber-optic transport exclusively
Answer: B
Rationale: Most cable operators have built their own IP telephone networks that use
Internet protocol rules .
5. Which VoIP service tier bypasses the cable operator's direct link to the PSTN
and routes packets over the Internet to another telephone company?
A) Tier I Primary VoIP
B) Tier II Secondary VoIP
C) Tier III Tertiary VoIP
D) Tier IV Emergency VoIP
Answer: B
Rationale: Tier II Secondary VoIP bypasses the direct PSTN link and routes packets over the
Internet to another telephone company .
, 6. When a call is made from a phone on a managed IP phone system to a phone
outside the managed IP phone system, how does the call get routed to the
receiving phone?
A) The router forwards the call directly
B) The gateway down-converts the digital data to analog electrical signal format and
routes the call to the PSTN
C) The call is routed through the cable modem
D) The call is routed through the Internet only
Answer: B
Rationale: The gateway down-converts digital data to analog electrical signal format and
routes the call to the PSTN .
7. Because a cable operator will support as many lines as technically possible for a
business customer, what does the installer have to do prior to connecting the
embedded multimedia terminal adapter (EMTA)?
A) Install a new drop cable
B) Check the RF signal levels on the cable entering the building
C) Configure the customer's PBX
D) Install additional outlets
Answer: B
Rationale: The installer must check the RF signal levels on the cable entering the building
before connecting the EMTA .
8. When a PBX or key system is involved in a business installation, what must
happen before the installer can begin connecting the equipment?
Practice Questions
1. Which concept has enabled Software as a Service (SaaS), Platform as a Service
(PaaS), and Networking as a Service (NaaS) offerings?
A) The use of fiber-optic transport exclusively
B) The separation of the transport and connectivity from the applications and services
running atop the transport
C) The adoption of IPv6 addressing
D) The implementation of DOCSIS 3.1
Answer: B
Rationale: The separation of transport/connectivity from applications and services running
atop the transport has enabled flexible service delivery models .
2. Which piece of equipment in a VoIP phone system routes a call to the public
switched telephone network (PSTN) when the receiving location is outside the
PacketCable managed IP network?
A) Router
B) Gateway
C) Switch
D) Modem
Answer: B
Rationale: The gateway down-converts digital data to analog electrical signal format and
routes the call to the PSTN .
,3. What are the three sub-network interfaces managed by PacketCable?
A) LAN, WAN, and MAN
B) Hybrid fiber/coax (HFC), managed IP, and public switched telephone network (PSTN)
C) IPv4, IPv6, and MAC
D) DOCSIS, VoIP, and PSTN
Answer: B
Rationale: PacketCable manages three sub-network interfaces: HFC, managed IP, and
PSTN .
4. Why is PacketCable VoIP a more efficient way of handling calls?
A) It uses less bandwidth than traditional telephony
B) Most cable operators have built their own IP telephone networks that use Internet
protocol rules
C) It eliminates the need for a PSTN connection
D) It uses fiber-optic transport exclusively
Answer: B
Rationale: Most cable operators have built their own IP telephone networks that use
Internet protocol rules .
5. Which VoIP service tier bypasses the cable operator's direct link to the PSTN
and routes packets over the Internet to another telephone company?
A) Tier I Primary VoIP
B) Tier II Secondary VoIP
C) Tier III Tertiary VoIP
D) Tier IV Emergency VoIP
Answer: B
Rationale: Tier II Secondary VoIP bypasses the direct PSTN link and routes packets over the
Internet to another telephone company .
, 6. When a call is made from a phone on a managed IP phone system to a phone
outside the managed IP phone system, how does the call get routed to the
receiving phone?
A) The router forwards the call directly
B) The gateway down-converts the digital data to analog electrical signal format and
routes the call to the PSTN
C) The call is routed through the cable modem
D) The call is routed through the Internet only
Answer: B
Rationale: The gateway down-converts digital data to analog electrical signal format and
routes the call to the PSTN .
7. Because a cable operator will support as many lines as technically possible for a
business customer, what does the installer have to do prior to connecting the
embedded multimedia terminal adapter (EMTA)?
A) Install a new drop cable
B) Check the RF signal levels on the cable entering the building
C) Configure the customer's PBX
D) Install additional outlets
Answer: B
Rationale: The installer must check the RF signal levels on the cable entering the building
before connecting the EMTA .
8. When a PBX or key system is involved in a business installation, what must
happen before the installer can begin connecting the equipment?
