Comptia A+ (core 1) QUESTIONS AND ASNWERS YEAR
2025.
infrared (IR) - ✅✅(line of sight)Electromagnetic radiation has a longer wavelength
than visible light but shorter than microwaves. We can feel infrared radiation as warmth.
-Many mobile devices are also equipped with an infrared(IR) sensor or blaster. This is
not used for data connections as such but does allow the device to interact with
appliances such as TVs and set-top boxes. An app on the device can be installed to
allow the mobile device to be used as a remote control for the appliance.
CHKDSK - ✅✅A Windows command to verify the hard drive does not have bad
sectors that can corrupt the file system.
(PAT) Portable Appliance Testing - ✅✅Device that ensures that a device is safe to
use. The frequency will depend on the environment in which the device is used.
fuse - ✅✅A safety device with a thin metal strip that will melt if too much current
passes through a circuit. Fuses come in different rating such as 3A,5A, and 13A. Most
computer equipment is rated at 3A or 5A. (with fuses you measure the resistance)
grounded - ✅✅Electrical equipment must also be grounded(or earthed). If there is a
fault that causes metal parts in the equipment to become live, a ground provides a path
of least resistance for the electrical current to flow away harmlessly. Most computer
product
If you want to connect an older flat panel display to your brand new non-Apple laptop,
which type of adapter would you use? - ✅✅You would use the HDMI to VGA adapter
to connect a laptop to an older flat panel display. This type of converter usually requires
an active Digital to Analog Converter (DAC) chip.
Older flat panels may only come with a VGA port so you would use the HDMI to VGA
port to connect the new laptop to the old flat panel display. It is unlikely to find an older
flat panel with an HDMI connector.
DVI may be found on older laptops; however, the question indicates that your laptop is
new. Most new laptops have HDMI ports.
You would use a Thunderbolt to DVI adapter to connect an older Apple computing
device to newer display devices.
Why would you use Shielded Twisted Pair (STP) Ethernet cable rather than unshielded
cable? - ✅✅Shielded cable is less susceptible to interference and crosstalk. Each
pair was surrounded by a braided shield. This cable construction is referred to as
Shielded Twisted Pair (STP).
,Fire retardant cables are used in the plenum space, where the chance of fire is much
greater so the cable is required to meet strict fire safety codes.
STP is bulky and difficult to install as a braided shield surrounds each pair, making the
cable harder to install.
Interference on the cable degrades communications so you want to prevent this.
Shielded cable makes it less susceptible to interference and crosstalk and does not
generate interference.
For the office network upgrade to Gigabit Ethernet, you need proper cabling. What is
your choice of cabling? - ✅✅Cat 5e has a capacity of 1 Gbps and is suitable for the
network. Cat 6 cable has a capacity of 10 Gbps and both are suitable for the network.
Cat 5 cable has a capacity of 100 Mbps and is unsuitable for the network. Cat 5e has a
capacity of 1 Gbps and is suitable for the network.
Cat 6 cable has a capacity of 10 Gbps and is suitable for the network. Cat 5 cable has
a capacity of 100 Mbps and is unsuitable for the network.
Cat 5 cable has a capacity of 100 Mbps and is unsuitable for the office network. Cat 6A
has a capacity of 10 Gbps and is suitable for the network.
A user reports their internet connection is not working. Which of these tools might you
use to troubleshoot the problem? - ✅✅A tone generator and probe tool is used to
trace a cable from one end to the other. This is the primary tool for testing for bad
network cables.
A loopback plug is used to test a port. It involves connecting pin 1 to pin 3 and pin 2 to
pin 6.
A multimeter can be used as a basic cable-testing tool by testing the continuity of
copper wires inside the cables. You would use this to identify broken wires.
Crimpers are tools to fix a jack to a cable. The wires are laid in the appropriate
terminals in the jack and the crimper tool then closes and seals the jack. If you replaced
a cable, you would need this.
Which category of Ethernet cable is 250MHz and carries 1-10 Gbps of data? - ✅✅Cat
6 uses 250MHz and carries 1Gbps of data up to 100m (328ft) and can carry 10Gbps of
data up to 55m (180ft). 1Gbps is used in 1000BASE-T neworks and 10Gbps is used in
10GBASE-T neworks.
Cat 5 uses 100MHz and carries 100Mbps of data up to 100m (328ft) and is used in
100BASE-TX networks.
,Cat 5e uses 100MHz and carries 1 Gbps of data up to 100m (328ft) and is used in
1000BASE-T networks.
Cat 6A uses 500MHz and carries 10 Gbps fo data up to 100m (328ft) and is used in
10GBASE-T networks.
IBM created which of these video connections? - ✅✅VGA
With which type of hardware would you expect to use a USB to Ethernet adapter? -
✅✅Slimline laptop
Which of these does NOT relate to a serial port? - ✅✅VESA
What is the main connection difference between USB-C and earlier versions of USB? -
✅✅The connector is small, flat and reversible.
trip hazard - ✅✅Items such as extension cords or tools lying on the ground in
walkways that can cause someone to stumble.
CRT Monitor (Cathode Ray Tube) - ✅✅an older type of computer monitor
Batteries - ✅✅swollen or leaking bateries from laptop computers or within cell phones
tablets must be handled very carefully and stored within appropriate containers. Use
gloves and safety goggles to minimize any risk of burns.
electronic discharge (ESD) - ✅✅occurs when a path is created that allows electrons
to rush from a statically charged body to another with an unequal charge.
electronic component - ✅✅such as a memory or logic chip, is composed of fine
conductive metal oxides deposited on a small piece of silicon.
self grounding - ✅✅a method to safeguard against ESD that involves touching the
computer case or power supply before touching a component in the computer case.
anti-esd service mat - ✅✅sensitive components can be placed on the mat safely. the
mats contain a snap that you connect to the wrist or leg strap.
field replaceable unit (FRU) - ✅✅a component in a computer or device that can be
replaced with a new component without sending the computer or device back to the
manufacturer. Examples: power supply, DIMM, Ram, motherboard, hard disk drive,
mouse, keyboard. FRUs are often shipped in anti static bags to protect them from ESD
damage.
anti static packaging - ✅✅includes either anti-ESD shielding or dissipative material.
, Anti-ESD Shielding - ✅✅this packaging reduces the risk of ESD because it is coated
with a conductive material(such as a nickel compound). This matierail prevents static
electricity form discharging through the inside of the bag
dissipative packaging - ✅✅this light pink or blue packaging reduces the build-up of
static in the general vicinity of the contents by being slightly more conductive than
normal.
In which atmospheric conditions is the risk of ESD(Electrostatic discharge) highest? -
✅✅The risk increases during dry, cool conditions when humidity is low.
which computer component presents the most danger electrical shock? - ✅✅Power
supplies
What component helps to protect users of electrical equipment against a short circuit? -
✅✅fuse
desktop computer - ✅✅refers to a PC that is not designed to be on the move.
system case(or chassis) - ✅✅is a plastic metal box that houses this second class of
components, such as the motherboard, Central Processing Unit(CPU), memory adapter
cards, disk drives, and power supply unit.
FRUs(Field Replaceable Unit) - ✅✅PC components that are easily user-replaceable
or (upgradeable)are referred to as field replaceable units (FRUs)Ex: Mouse, CPU ,
keyboards
Tower Case - ✅✅is designed to sit vertically on surface, so that it is taller than its is
wide. Tower cases come in four basic sizes: full, mid, mini and slim line.
Full Tower Case - ✅✅(usually has 6 bays) are usually used for PC servers. These
require the extra internal space for additional hard disks, adapter cards, and redundant
power supply units.
Mid Tower Case - ✅✅(Usually has three or four bays) are used for high-end user
PCs. These PCs do require extra devices and adapter cars, but not as many as a
server.
Mini Tower Cases - ✅✅are usually used for office or home PCs where the
requirement for additional internal devices and adapter cards is limited.
slimline cases - ✅✅require low profile adapter cards but can be oriented horizontally
or vertically.
2025.
infrared (IR) - ✅✅(line of sight)Electromagnetic radiation has a longer wavelength
than visible light but shorter than microwaves. We can feel infrared radiation as warmth.
-Many mobile devices are also equipped with an infrared(IR) sensor or blaster. This is
not used for data connections as such but does allow the device to interact with
appliances such as TVs and set-top boxes. An app on the device can be installed to
allow the mobile device to be used as a remote control for the appliance.
CHKDSK - ✅✅A Windows command to verify the hard drive does not have bad
sectors that can corrupt the file system.
(PAT) Portable Appliance Testing - ✅✅Device that ensures that a device is safe to
use. The frequency will depend on the environment in which the device is used.
fuse - ✅✅A safety device with a thin metal strip that will melt if too much current
passes through a circuit. Fuses come in different rating such as 3A,5A, and 13A. Most
computer equipment is rated at 3A or 5A. (with fuses you measure the resistance)
grounded - ✅✅Electrical equipment must also be grounded(or earthed). If there is a
fault that causes metal parts in the equipment to become live, a ground provides a path
of least resistance for the electrical current to flow away harmlessly. Most computer
product
If you want to connect an older flat panel display to your brand new non-Apple laptop,
which type of adapter would you use? - ✅✅You would use the HDMI to VGA adapter
to connect a laptop to an older flat panel display. This type of converter usually requires
an active Digital to Analog Converter (DAC) chip.
Older flat panels may only come with a VGA port so you would use the HDMI to VGA
port to connect the new laptop to the old flat panel display. It is unlikely to find an older
flat panel with an HDMI connector.
DVI may be found on older laptops; however, the question indicates that your laptop is
new. Most new laptops have HDMI ports.
You would use a Thunderbolt to DVI adapter to connect an older Apple computing
device to newer display devices.
Why would you use Shielded Twisted Pair (STP) Ethernet cable rather than unshielded
cable? - ✅✅Shielded cable is less susceptible to interference and crosstalk. Each
pair was surrounded by a braided shield. This cable construction is referred to as
Shielded Twisted Pair (STP).
,Fire retardant cables are used in the plenum space, where the chance of fire is much
greater so the cable is required to meet strict fire safety codes.
STP is bulky and difficult to install as a braided shield surrounds each pair, making the
cable harder to install.
Interference on the cable degrades communications so you want to prevent this.
Shielded cable makes it less susceptible to interference and crosstalk and does not
generate interference.
For the office network upgrade to Gigabit Ethernet, you need proper cabling. What is
your choice of cabling? - ✅✅Cat 5e has a capacity of 1 Gbps and is suitable for the
network. Cat 6 cable has a capacity of 10 Gbps and both are suitable for the network.
Cat 5 cable has a capacity of 100 Mbps and is unsuitable for the network. Cat 5e has a
capacity of 1 Gbps and is suitable for the network.
Cat 6 cable has a capacity of 10 Gbps and is suitable for the network. Cat 5 cable has
a capacity of 100 Mbps and is unsuitable for the network.
Cat 5 cable has a capacity of 100 Mbps and is unsuitable for the office network. Cat 6A
has a capacity of 10 Gbps and is suitable for the network.
A user reports their internet connection is not working. Which of these tools might you
use to troubleshoot the problem? - ✅✅A tone generator and probe tool is used to
trace a cable from one end to the other. This is the primary tool for testing for bad
network cables.
A loopback plug is used to test a port. It involves connecting pin 1 to pin 3 and pin 2 to
pin 6.
A multimeter can be used as a basic cable-testing tool by testing the continuity of
copper wires inside the cables. You would use this to identify broken wires.
Crimpers are tools to fix a jack to a cable. The wires are laid in the appropriate
terminals in the jack and the crimper tool then closes and seals the jack. If you replaced
a cable, you would need this.
Which category of Ethernet cable is 250MHz and carries 1-10 Gbps of data? - ✅✅Cat
6 uses 250MHz and carries 1Gbps of data up to 100m (328ft) and can carry 10Gbps of
data up to 55m (180ft). 1Gbps is used in 1000BASE-T neworks and 10Gbps is used in
10GBASE-T neworks.
Cat 5 uses 100MHz and carries 100Mbps of data up to 100m (328ft) and is used in
100BASE-TX networks.
,Cat 5e uses 100MHz and carries 1 Gbps of data up to 100m (328ft) and is used in
1000BASE-T networks.
Cat 6A uses 500MHz and carries 10 Gbps fo data up to 100m (328ft) and is used in
10GBASE-T networks.
IBM created which of these video connections? - ✅✅VGA
With which type of hardware would you expect to use a USB to Ethernet adapter? -
✅✅Slimline laptop
Which of these does NOT relate to a serial port? - ✅✅VESA
What is the main connection difference between USB-C and earlier versions of USB? -
✅✅The connector is small, flat and reversible.
trip hazard - ✅✅Items such as extension cords or tools lying on the ground in
walkways that can cause someone to stumble.
CRT Monitor (Cathode Ray Tube) - ✅✅an older type of computer monitor
Batteries - ✅✅swollen or leaking bateries from laptop computers or within cell phones
tablets must be handled very carefully and stored within appropriate containers. Use
gloves and safety goggles to minimize any risk of burns.
electronic discharge (ESD) - ✅✅occurs when a path is created that allows electrons
to rush from a statically charged body to another with an unequal charge.
electronic component - ✅✅such as a memory or logic chip, is composed of fine
conductive metal oxides deposited on a small piece of silicon.
self grounding - ✅✅a method to safeguard against ESD that involves touching the
computer case or power supply before touching a component in the computer case.
anti-esd service mat - ✅✅sensitive components can be placed on the mat safely. the
mats contain a snap that you connect to the wrist or leg strap.
field replaceable unit (FRU) - ✅✅a component in a computer or device that can be
replaced with a new component without sending the computer or device back to the
manufacturer. Examples: power supply, DIMM, Ram, motherboard, hard disk drive,
mouse, keyboard. FRUs are often shipped in anti static bags to protect them from ESD
damage.
anti static packaging - ✅✅includes either anti-ESD shielding or dissipative material.
, Anti-ESD Shielding - ✅✅this packaging reduces the risk of ESD because it is coated
with a conductive material(such as a nickel compound). This matierail prevents static
electricity form discharging through the inside of the bag
dissipative packaging - ✅✅this light pink or blue packaging reduces the build-up of
static in the general vicinity of the contents by being slightly more conductive than
normal.
In which atmospheric conditions is the risk of ESD(Electrostatic discharge) highest? -
✅✅The risk increases during dry, cool conditions when humidity is low.
which computer component presents the most danger electrical shock? - ✅✅Power
supplies
What component helps to protect users of electrical equipment against a short circuit? -
✅✅fuse
desktop computer - ✅✅refers to a PC that is not designed to be on the move.
system case(or chassis) - ✅✅is a plastic metal box that houses this second class of
components, such as the motherboard, Central Processing Unit(CPU), memory adapter
cards, disk drives, and power supply unit.
FRUs(Field Replaceable Unit) - ✅✅PC components that are easily user-replaceable
or (upgradeable)are referred to as field replaceable units (FRUs)Ex: Mouse, CPU ,
keyboards
Tower Case - ✅✅is designed to sit vertically on surface, so that it is taller than its is
wide. Tower cases come in four basic sizes: full, mid, mini and slim line.
Full Tower Case - ✅✅(usually has 6 bays) are usually used for PC servers. These
require the extra internal space for additional hard disks, adapter cards, and redundant
power supply units.
Mid Tower Case - ✅✅(Usually has three or four bays) are used for high-end user
PCs. These PCs do require extra devices and adapter cars, but not as many as a
server.
Mini Tower Cases - ✅✅are usually used for office or home PCs where the
requirement for additional internal devices and adapter cards is limited.
slimline cases - ✅✅require low profile adapter cards but can be oriented horizontally
or vertically.
