Comptia A+ Core 1 (Exam 220-1001) – Glossary |
Objective Assessment Toolkit: Graded Solutions &
High-Accuracy Questions 2024/2025
Current - correct answer the actual flow of electrons, measured in Amps (I).
Cylinder - correct answer the aggregate of all tracks that reside in the same location on
every disk surface.
DAV - correct answer (Digital-to-Analog Converter) A sound card component that
converts the digital signals generated by the CPU to an analog electrical signal that can
drive speakers.
Daughter board - correct answer A circuit board that connects to the motherboard to
provide extra expansion slots or connectors. Typically, these are used in slimline case
designs so that adapter cards can be installed parallel to the motherboard, reducing the
height of the case.
DB-9 - correct answer Although the original serial port used a 25-pin male D connector,
most pcs today use a male DB-9 (9-pin) port.
DC - correct answer (Direct Current) pcs and most computer components function by
using power supplied in the form of direct current. This is normally at low voltage and is
produced by stepping down the voltage from the building supply. Direct current, unlike
alternating current, does not oscillate between positive and negative states.
DDR SDRAM - correct answer (Double Data Rate Synchronous Dynamic Random
Access Memory) A standard for SDRAM where data is transferred twice per clock cycle
(making the maximum data rate 64x the bus speed in bps). DDR2/DDR3/DDR4 SDRAM
uses lower voltage chips and higher bus speeds.
,Default gateway - correct answer The default gateway is an IP configuration parameter
that identifies the location of a router on the local subnet that the host can use to contact
other networks.
Default mask - correct answer In the early days of IP addressing, the network ID was
determined automatically from the first octet of the address. When subnet masks were
introduced, the "default" masks (255.0.0.0, 255.255.0.0, and 255.255.255.0) that
corresponded to treating the first octet as classful were commonly described as "class
A", "class B", and "class C" masks. The Internet no longer uses classful addressing but
many lans use the private IP address ranges and the default masks.
Defense in depth - correct answer Configuring security controls on hosts (endpoints)
as well as providing network (perimeter) security, physical security, and administrative
controls.
Desktop computer - correct answer A computing device designed to be placed on or
near a user's desk.
Detac corona - correct answer A strip that removes the charge to prevent paper curl in
a laser printer.
Developer roller - correct answer A magnetized roller to which toner adheres during the
printing process.
Developer unit - correct answer Assembly that applies toner to areas of the
photoconductor where charge has been removed by the laser. The main components
are a toner hopper, transfer roller, waste toner hopper, a screw or blade to stir the toner,
and a doctor blade to ensure the correct level of toner on the developer roller.
DHCP Server - correct answer (Dynamic Host Configuration Protocol Server) A
networking service that allows a client to request an appropriate IP configuration from a
server. The server is configured with a range of addresses to lease. Hosts can be
allocated to an IP address dynamically or be assigned a reserved IP address, based on
the host's MAC address. The server can also provide other configuration information,
such as the location of DNS servers. DHCP utilizes UDP ports 67 and 68. It is important
,to monitor the network to ensure that only valid DHCP servers are running on the
network.
Dial-up - correct answer A remote network access method that utilizes the local
telephone line (Plain Old Telephone System [POTS]) to establish a connection between
two computers fitted with modems. Dial-up is a legacy method of Internet access. It may
still be deployed for special administrative purposes or as an emergency backup
connection method. Configuration is generally a case of setting the telephone number,
username, and password.
Die - correct answer The are on a silicon chip containing millions of transistors and
signal pathways created by the hoping process.
Digital assistant - correct answer A voice interface designed to respond to natural
language commands and queries.
Digital camera - correct answer A version of a 35mm film camera where the film is
replaced by light-sensitive diodes (an array of ccds [Charge Coupled Device]) and
electronic storage media (typically a flash memory card). The sensitivity of the array
determines the maximum resolution of the image, measured in megapixels.
Digital display - correct answer A computer monitor that accepts a digital signal. Flat-
panel monitors use digital signals and only support lower resolutions by interpolating the
image, which can make it appear fuzzy.
Digitizer - correct answer As part of a touchscreen assembly, the digitizer is a touch-
sensitive glass panel covering the LCD. The panel converts touch events to digital
signals that can be interpreted as different types of input.
Dim display - correct answer When a mobile device has the backlight set to its lowest
setting and the automatic light adjustment is disabled, or the phone is set to conserve
power by auto-dimming the light.
, DIMM - correct answer (Dual In-line Memory Module) The standard packaging for
system memory. There are different pin configurations for different RAM types (DDR
SDRAM [184], DDR2/3 SDRAM [240], and DDR4 SDRAM [288]).
Diode - correct answer A valve, allowing current to flow in one direction only. These are
used in a computer's power supply and as protection for components.
Direct thermal printer - correct answer A thermal printer that uses heated pins to form
images directly onto specially coated thermal paper.
Disk defragmentation - correct answer Fragmentation occurs when a data file is not
saved to contiguous sectors on a disk. This decreases performance by making the disk
read/write heads move between fragments. Defragmentation is a software routine that
compacts files back into contiguous areas of the disk. The process can be run from a
command-line using the defrag utility, but it is more often run from Windows.
Disk striping - correct answer A disk array access pattern where data is written in
stripes to two or more disks sequentially, improving performance. Note that a RAID 0
striped volume provides no redundancy, and if any of the physical disks in the set fails,
the whole volume will be lost.
Disk thrashing - correct answer A state in which the main memory is filled up, pages
are swapped in and out of virtual memory - which needs to be written to the hard disk -
in rapid succession, leading to possible early drive failure.
Displayport - correct answer Digital A/V interface developed by VESA. Displayport
supports some cross-compatibility with DVI and HDMI devices.
Distended capacitors - correct answer Capacitors that are swollen or bulging or
emitting residue indicates that they have been damaged or could have failed due to a
manufacturing defect.
Distinguished name - correct answer A unique identifier for any given resource within
the LDAP directory.
Objective Assessment Toolkit: Graded Solutions &
High-Accuracy Questions 2024/2025
Current - correct answer the actual flow of electrons, measured in Amps (I).
Cylinder - correct answer the aggregate of all tracks that reside in the same location on
every disk surface.
DAV - correct answer (Digital-to-Analog Converter) A sound card component that
converts the digital signals generated by the CPU to an analog electrical signal that can
drive speakers.
Daughter board - correct answer A circuit board that connects to the motherboard to
provide extra expansion slots or connectors. Typically, these are used in slimline case
designs so that adapter cards can be installed parallel to the motherboard, reducing the
height of the case.
DB-9 - correct answer Although the original serial port used a 25-pin male D connector,
most pcs today use a male DB-9 (9-pin) port.
DC - correct answer (Direct Current) pcs and most computer components function by
using power supplied in the form of direct current. This is normally at low voltage and is
produced by stepping down the voltage from the building supply. Direct current, unlike
alternating current, does not oscillate between positive and negative states.
DDR SDRAM - correct answer (Double Data Rate Synchronous Dynamic Random
Access Memory) A standard for SDRAM where data is transferred twice per clock cycle
(making the maximum data rate 64x the bus speed in bps). DDR2/DDR3/DDR4 SDRAM
uses lower voltage chips and higher bus speeds.
,Default gateway - correct answer The default gateway is an IP configuration parameter
that identifies the location of a router on the local subnet that the host can use to contact
other networks.
Default mask - correct answer In the early days of IP addressing, the network ID was
determined automatically from the first octet of the address. When subnet masks were
introduced, the "default" masks (255.0.0.0, 255.255.0.0, and 255.255.255.0) that
corresponded to treating the first octet as classful were commonly described as "class
A", "class B", and "class C" masks. The Internet no longer uses classful addressing but
many lans use the private IP address ranges and the default masks.
Defense in depth - correct answer Configuring security controls on hosts (endpoints)
as well as providing network (perimeter) security, physical security, and administrative
controls.
Desktop computer - correct answer A computing device designed to be placed on or
near a user's desk.
Detac corona - correct answer A strip that removes the charge to prevent paper curl in
a laser printer.
Developer roller - correct answer A magnetized roller to which toner adheres during the
printing process.
Developer unit - correct answer Assembly that applies toner to areas of the
photoconductor where charge has been removed by the laser. The main components
are a toner hopper, transfer roller, waste toner hopper, a screw or blade to stir the toner,
and a doctor blade to ensure the correct level of toner on the developer roller.
DHCP Server - correct answer (Dynamic Host Configuration Protocol Server) A
networking service that allows a client to request an appropriate IP configuration from a
server. The server is configured with a range of addresses to lease. Hosts can be
allocated to an IP address dynamically or be assigned a reserved IP address, based on
the host's MAC address. The server can also provide other configuration information,
such as the location of DNS servers. DHCP utilizes UDP ports 67 and 68. It is important
,to monitor the network to ensure that only valid DHCP servers are running on the
network.
Dial-up - correct answer A remote network access method that utilizes the local
telephone line (Plain Old Telephone System [POTS]) to establish a connection between
two computers fitted with modems. Dial-up is a legacy method of Internet access. It may
still be deployed for special administrative purposes or as an emergency backup
connection method. Configuration is generally a case of setting the telephone number,
username, and password.
Die - correct answer The are on a silicon chip containing millions of transistors and
signal pathways created by the hoping process.
Digital assistant - correct answer A voice interface designed to respond to natural
language commands and queries.
Digital camera - correct answer A version of a 35mm film camera where the film is
replaced by light-sensitive diodes (an array of ccds [Charge Coupled Device]) and
electronic storage media (typically a flash memory card). The sensitivity of the array
determines the maximum resolution of the image, measured in megapixels.
Digital display - correct answer A computer monitor that accepts a digital signal. Flat-
panel monitors use digital signals and only support lower resolutions by interpolating the
image, which can make it appear fuzzy.
Digitizer - correct answer As part of a touchscreen assembly, the digitizer is a touch-
sensitive glass panel covering the LCD. The panel converts touch events to digital
signals that can be interpreted as different types of input.
Dim display - correct answer When a mobile device has the backlight set to its lowest
setting and the automatic light adjustment is disabled, or the phone is set to conserve
power by auto-dimming the light.
, DIMM - correct answer (Dual In-line Memory Module) The standard packaging for
system memory. There are different pin configurations for different RAM types (DDR
SDRAM [184], DDR2/3 SDRAM [240], and DDR4 SDRAM [288]).
Diode - correct answer A valve, allowing current to flow in one direction only. These are
used in a computer's power supply and as protection for components.
Direct thermal printer - correct answer A thermal printer that uses heated pins to form
images directly onto specially coated thermal paper.
Disk defragmentation - correct answer Fragmentation occurs when a data file is not
saved to contiguous sectors on a disk. This decreases performance by making the disk
read/write heads move between fragments. Defragmentation is a software routine that
compacts files back into contiguous areas of the disk. The process can be run from a
command-line using the defrag utility, but it is more often run from Windows.
Disk striping - correct answer A disk array access pattern where data is written in
stripes to two or more disks sequentially, improving performance. Note that a RAID 0
striped volume provides no redundancy, and if any of the physical disks in the set fails,
the whole volume will be lost.
Disk thrashing - correct answer A state in which the main memory is filled up, pages
are swapped in and out of virtual memory - which needs to be written to the hard disk -
in rapid succession, leading to possible early drive failure.
Displayport - correct answer Digital A/V interface developed by VESA. Displayport
supports some cross-compatibility with DVI and HDMI devices.
Distended capacitors - correct answer Capacitors that are swollen or bulging or
emitting residue indicates that they have been damaged or could have failed due to a
manufacturing defect.
Distinguished name - correct answer A unique identifier for any given resource within
the LDAP directory.
