CompTIA A+ 1101 Essentials: Study
Cards for Quick Mastery: *Q&A* (100%
Correct) 2025/2026 |VERIFIED|
What is the full form of SATA and what does it refer to? Serial Advanced Technology Attachment, a
standard for connecting hard drives to computers.
What does PCI stand for and what does it represent? Peripheral Component Interconnect, a
legacy standard for connecting expansion cards in a computer.
What communication method does PCI use? 32-bit and 64-bit parallel communication.
What are the voltage requirements for PCI? 3.3V and 5V.
What is the range of NFC technology? 4cm.
What does LCD stand for and how does it function? Liquid Crystal Display, where light passes
through liquid filters to create an image.
What are the three types of LCDs and what do their acronyms stand for? TN = Twisted Nematic,
IPS = In-Plane Switching, VA = Vertical Alignment.
How do the different types of LCDs compare? TN offers better response time but poor wide
viewing angles and low power consumption; IPS has superior color accuracy, wider viewing angles, but is
more expensive; VA delivers the best contrast but suffers from poor angles.
What are the two primary types of LCD backlighting? CCFL (Cold Cathode Fluorescent Lamp) and
LED.
What makes CCFL backlighting unique? It uses AC power, so an inverter is needed to convert it to
the required DC power for the computer.
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,How many pins does USB-C have, and what makes it distinctive? USB-C has 24 pins and can
transmit various signals such as HDMI and DisplayPort.
What connection was used before USB, and what type of signal did it carry? How many pins did it have?
DB-9 cable carrying RS232 signal, with 9 pins.
What types of styluses exist and how do they differ? Capacitive stylus is used like a touch pen,
while active stylus, like the Apple Pencil, can communicate independently with the device.
What is the older connection type for headsets, and what signal does it carry? The 3.5mm TRRS
(Tip-Ring-Ring-Sleeve) connection, which carries an analog signal.
What were the 2G networks and what did they stand for? GSM (Global System for Mobile
Communication) and CDMA (Code Division Multiple Access).
Which companies used GSM and how did it operate? AT&T and T-Mobile used GSM, which
employed multiplexing for simultaneous signal transmission.
What does multiplexing refer to in communication systems? Multiplexing allows multiple data
signals to use the same channel without interference.
Which companies used CDMA, and how did it work? Verizon and Sprint used CDMA, where each
user had a unique code for communication.
What was the primary goal of 4G technology, and what does LTE stand for? To integrate GSM and
CDMA technologies, with LTE standing for Long Term Evolution.
What does EDGE stand for in mobile networks? Enhanced Data Rates for GSM Evolution.
What is the function of PRL, and how is it updated? PRL stands for Preferred Roaming List, which
allows a device to connect to the correct tower, updated over the air (OTA).
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,How does GPS work and how many satellites are necessary for accurate location? GPS relies on 30
satellites, and at least 4 need to be visible for accurate location tracking.
What is MDM and what is its purpose? Mobile Device Management allows organizations to
control and secure user devices from a centralized console.
What is meant by a partition in computer storage? A partition separates company data from
personal data on a device.
What are the two types of IP payloads and their meanings? TCP (Transmission Control Protocol)
and UDP (User Datagram Protocol).
What does "in the clear" mean in terms of data communication? It means the data is not
encrypted.
Why is it important to use both TCP and UDP for IP communication? TCP and UDP enable
multiplexing, allowing different applications to use the same network channels.
How does TCP function? TCP requires a formal setup and teardown to establish communication,
ensuring reliable data transmission with flow control.
What are examples of protocols that use TCP? HTTPS (Hypertext Transfer Protocol Secure) and
SSH (Secure Shell).
How does UDP differ from TCP? UDP does not require a formal setup or confirmation of data sent,
making it ideal for real-time communication.
What are examples of protocols that use UDP? DHCP (Dynamic Host Configuration Protocol) and
TFTP (Trivial File Transfer Protocol).
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, What is the difference between non-ephemeral and ephemeral ports? Non-ephemeral ports are
permanent, used for specific services, while ephemeral ports change for client-side communication.
What is a key feature of ports in relation to TCP and UDP? Ports are used for communication, not
security, and TCP and UDP can share the same port numbers simultaneously.
What is FTP and what ports does it use? File Transfer Protocol, using TCP ports 20 and 21 for
transferring files between systems.
What is Telnet and what port does it use? Telnet is a remote command console protocol using TCP
port 23, transmitting data in the clear.
What is SSH and what port does it use? Secure Shell is a protocol for encrypted remote command
console access, using TCP port 22.
What is SMTP and what port does it use? Simple Mail Transfer Protocol is used for sending emails,
operating on TCP port 25.
What is DNS and what port does it use? Domain Name System resolves domain names to IP
addresses, using UDP port 53.
What does DHCP do and what ports does it use? Dynamic Host Configuration Protocol assigns IP
addresses to local devices, using UDP ports 67 and 68.
What are HTTP and HTTPS, and what ports do they use? HTTP (Hypertext Transfer Protocol) and
HTTPS (secure version) operate on TCP ports 80 and 443, respectively.
What is POP3 and what port does it use? Post Office Protocol version 3 is used for retrieving email
from a single device, using TCP port 110.
What is IMAP and what port does it use? Internet Message Access Protocol version 4 manages
email from multiple devices, using TCP port 143.
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