CompTIA A+ Professional Certification
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. A technician is configuring a SOHO network and needs to ensure that
internal devices can communicate with each other while restricting
unauthorized access from the internet. Which of the following features
should be enabled on the wireless router? A. DHCP B. Firewall C. WPA3 D.
SSID Broadcast Rationale: A firewall inspects incoming and outgoing traffic
and decides whether to allow or block specific traffic based on a defined
set of security rules, which is the primary mechanism for restricting
unauthorized access from the internet while allowing internal traffic.
2. Which of the following expansion cards would most likely be installed to
provide high-speed data transfer for an external storage device that uses a
specific interface not natively supported by the motherboard? A. Sound
card B. Network interface card C. Host bus adapter D. Graphics card
Rationale: A host bus adapter (HBA) connects a host system such as a
computer to other network and storage devices, providing the necessary
interface for high-speed connectivity when the motherboard lacks native
ports.
3. A user reports that their laptop screen is extremely dim, even when the
brightness is set to the maximum level. Which of the following components
is the most likely cause of this issue? A. LCD panel B. Video cable C. Inverter
D. Backlight bulb Rationale: In older LCD laptops, the inverter provides
power to the backlight; if the inverter fails, the light is not sufficiently
, powered, resulting in a very dim display, though modern LED screens may
require a display assembly replacement.
4. Which of the following commands is used in Windows to display the current
network configuration, including IP address, subnet mask, and default
gateway? A. ping B. ipconfig C. nslookup D. tracert Rationale: The ipconfig
command-line tool is specifically designed to display the current TCP/IP
network configuration values, providing a quick view of the local interface
settings.
5. A technician needs to upgrade the memory on a workstation that supports
dual-channel architecture. To maximize performance, how should the RAM
modules be installed? A. In any available slot B. In adjacent slots C. In
matching color-coded slots D. One in each bank Rationale: Dual-channel
memory architecture requires that matching modules be installed in
specific, usually color-coded, motherboard slots to enable the CPU to
access both modules simultaneously, effectively doubling the bandwidth.
6. Which type of connector is commonly used for twisted-pair cabling in
modern Ethernet networks? A. BNC B. ST C. RJ-45 D. F-connector Rationale:
The RJ-45 (Registered Jack 45) connector is the standard physical
connector used for Ethernet networking cables, which contain eight wires
for data transmission.
7. A laser printer is producing pages with vertical streaks or lines running
down the page. Which of the following components should be inspected
first? A. Fuser assembly B. Pickup rollers C. Imaging drum D. Transfer belt
Rationale: Vertical lines or streaks on a laser printer output are typically
caused by debris, scratches, or wear on the photosensitive imaging drum,
which transfers the toner to the paper.
8. Which cloud computing model provides virtualized computing resources
over the internet, allowing users to rent infrastructure such as servers and
storage? A. SaaS B. PaaS C. IaaS D. DaaS Rationale: Infrastructure as a
Service (IaaS) provides virtualized computing resources, such as servers,
, storage, and networking, over the internet, giving administrators control
over the operating systems and deployed applications.
9. A technician wants to prevent unauthorized wireless devices from
connecting to a corporate network. Which of the following is the most
effective security measure? A. Disabling SSID broadcast B. MAC address
filtering C. Changing the default SSID D. Using WEP encryption Rationale:
MAC address filtering allows administrators to create a whitelist of
hardware addresses that are permitted to associate with the wireless
access point, thereby blocking unauthorized hardware at the data link
layer.
10.Which storage device uses non-volatile memory to store data and has no
moving parts, resulting in faster read/write speeds and higher durability? A.
SSD B. HDD C. SSHD D. Optical drive Rationale: Solid State Drives (SSD) use
NAND-based flash memory, which lacks the mechanical read/write heads
and spinning platters of Hard Disk Drives (HDD), leading to significantly
faster access times and resistance to physical shock.
11.A user is experiencing slow performance on their computer. The technician
checks the Task Manager and notices that the disk usage is consistently at
100%. Which of the following is the best first step to take? A. Replace the
power supply B. Replace the RAM C. Identify the process causing the usage
D. Flash the BIOS Rationale: Identifying the specific application or service
causing high disk activity is the necessary first step to determine if it is a
legitimate system process, a background update, or a potentially
malicious application before hardware replacement is considered.
12.Which of the following ports is typically used by secure web traffic? A. 21 B.
80 C. 443 D. 25 Rationale: Port 443 is the standard port designated for
HTTPS (Hypertext Transfer Protocol Secure), which uses TLS/SSL to encrypt
traffic between a web browser and a server.
13.A technician is building a computer for video editing. Which of the following
components should be prioritized to handle large rendering workloads? A.
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A technician is configuring a SOHO network and needs to ensure that
internal devices can communicate with each other while restricting
unauthorized access from the internet. Which of the following features
should be enabled on the wireless router? A. DHCP B. Firewall C. WPA3 D.
SSID Broadcast Rationale: A firewall inspects incoming and outgoing traffic
and decides whether to allow or block specific traffic based on a defined
set of security rules, which is the primary mechanism for restricting
unauthorized access from the internet while allowing internal traffic.
2. Which of the following expansion cards would most likely be installed to
provide high-speed data transfer for an external storage device that uses a
specific interface not natively supported by the motherboard? A. Sound
card B. Network interface card C. Host bus adapter D. Graphics card
Rationale: A host bus adapter (HBA) connects a host system such as a
computer to other network and storage devices, providing the necessary
interface for high-speed connectivity when the motherboard lacks native
ports.
3. A user reports that their laptop screen is extremely dim, even when the
brightness is set to the maximum level. Which of the following components
is the most likely cause of this issue? A. LCD panel B. Video cable C. Inverter
D. Backlight bulb Rationale: In older LCD laptops, the inverter provides
power to the backlight; if the inverter fails, the light is not sufficiently
, powered, resulting in a very dim display, though modern LED screens may
require a display assembly replacement.
4. Which of the following commands is used in Windows to display the current
network configuration, including IP address, subnet mask, and default
gateway? A. ping B. ipconfig C. nslookup D. tracert Rationale: The ipconfig
command-line tool is specifically designed to display the current TCP/IP
network configuration values, providing a quick view of the local interface
settings.
5. A technician needs to upgrade the memory on a workstation that supports
dual-channel architecture. To maximize performance, how should the RAM
modules be installed? A. In any available slot B. In adjacent slots C. In
matching color-coded slots D. One in each bank Rationale: Dual-channel
memory architecture requires that matching modules be installed in
specific, usually color-coded, motherboard slots to enable the CPU to
access both modules simultaneously, effectively doubling the bandwidth.
6. Which type of connector is commonly used for twisted-pair cabling in
modern Ethernet networks? A. BNC B. ST C. RJ-45 D. F-connector Rationale:
The RJ-45 (Registered Jack 45) connector is the standard physical
connector used for Ethernet networking cables, which contain eight wires
for data transmission.
7. A laser printer is producing pages with vertical streaks or lines running
down the page. Which of the following components should be inspected
first? A. Fuser assembly B. Pickup rollers C. Imaging drum D. Transfer belt
Rationale: Vertical lines or streaks on a laser printer output are typically
caused by debris, scratches, or wear on the photosensitive imaging drum,
which transfers the toner to the paper.
8. Which cloud computing model provides virtualized computing resources
over the internet, allowing users to rent infrastructure such as servers and
storage? A. SaaS B. PaaS C. IaaS D. DaaS Rationale: Infrastructure as a
Service (IaaS) provides virtualized computing resources, such as servers,
, storage, and networking, over the internet, giving administrators control
over the operating systems and deployed applications.
9. A technician wants to prevent unauthorized wireless devices from
connecting to a corporate network. Which of the following is the most
effective security measure? A. Disabling SSID broadcast B. MAC address
filtering C. Changing the default SSID D. Using WEP encryption Rationale:
MAC address filtering allows administrators to create a whitelist of
hardware addresses that are permitted to associate with the wireless
access point, thereby blocking unauthorized hardware at the data link
layer.
10.Which storage device uses non-volatile memory to store data and has no
moving parts, resulting in faster read/write speeds and higher durability? A.
SSD B. HDD C. SSHD D. Optical drive Rationale: Solid State Drives (SSD) use
NAND-based flash memory, which lacks the mechanical read/write heads
and spinning platters of Hard Disk Drives (HDD), leading to significantly
faster access times and resistance to physical shock.
11.A user is experiencing slow performance on their computer. The technician
checks the Task Manager and notices that the disk usage is consistently at
100%. Which of the following is the best first step to take? A. Replace the
power supply B. Replace the RAM C. Identify the process causing the usage
D. Flash the BIOS Rationale: Identifying the specific application or service
causing high disk activity is the necessary first step to determine if it is a
legitimate system process, a background update, or a potentially
malicious application before hardware replacement is considered.
12.Which of the following ports is typically used by secure web traffic? A. 21 B.
80 C. 443 D. 25 Rationale: Port 443 is the standard port designated for
HTTPS (Hypertext Transfer Protocol Secure), which uses TLS/SSL to encrypt
traffic between a web browser and a server.
13.A technician is building a computer for video editing. Which of the following
components should be prioritized to handle large rendering workloads? A.
