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NCTI Chapter 1 Questions with complete solution 2023
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NCTI Chapter 1 Questions with complete solution 2023
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NCTI Chapter 1The first version of the Data Over Cable Service Interface Specification (DOCSIS) was
approved as an international standard by what organization? - correct answer The
International Telecommunication Union (ITU).
What layers of the open systems interconnection (OSI) model are applied between Data
Over Cable Service Interface Specification (DOCSIS) modems and the cable modem
termination system (CMTS)? - correct answer Layers one through four (Physical
Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the
DOCSIS modem and CMTS.
Each version of the Data Over Cable Service Interface Specification (DOCSIS) adds
features and improvements over the previous version. What features does DOCSIS 2.0
add? - correct answer Increased bandwidth of the upstream and advanced access
systems so that higher orders of modulation (and higher data rates) are possible.
Of the two sets of protocols, transmission control protocol/Internet protocol (TCP/IP)
and simple network management protocol (SNMP), which is used for routing the
packets of data over the Internet? - correct answer TCP/IP provides the basic protocol
for directing data traffic over the Internet by dividing the data packet into four elements:
the packet sequence; the data; the destination address; and the checksum of data.
In a client/server relationship there are two types of client categories: thin clients and
thick clients. What is the difference between the two client categories? - correct answer
Thin clients are not capable of running applications independent of the server. Thick
clients are capable of downloading and running installed applications independent of a
server.
How do media access control (MAC) protocols increase the efficiency of upstream
transmissions from the cable modems? - correct answer When an upstream
transmission request is received, the MAC protocols instruct the cable modem when to
transmit, its bandwidth, and its transmission interval to prevent or decrease the number
of upstream packet collisions. The reduction of collisions increases the upstream
transmission efficiency since colliding packets need not be resent.
What is channel bonding? - correct answer Channel bonding combines the data
throughput of a single channel with a number of channels to achieve a maximum data
throughput equal to the cumulative total of the bonded channels.
How does a cable modem know what frequency and carrier level it should transmit
upstream? - correct answer When powered on and connected to cable system, the
cable modem receives an upstream channel descriptor (UCD) which contains upstream
transmission parameters, including frequency and carrier level.
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