Professor Messer CompTIA A+ 1101

question

answer

LCD acronym

Liquid Crystal Display

Advantages of LCD display

Lightweight, low power, relatively inexpensive

Twisted Nematic (TN) LCD

The original LCD tech with fast response time but with poor viewing angles (color shifts). Reduced color representation compared to IPS.

Vertical Alignment (VA) LCD

Good compromise between TN and IPS LCD, has good color representation but has slower response times

IPS acronym (display)

In Plane Switching

VA acronym (display)

Vertical Alignment

Where is a Wi-Fi antenna commonly located on a laptop?

Inside at the top of the monitor, the wires wrap all the way around the monitor and attach to the system board.

CCFL acronym (display)

Cold Cathode Fluorescent Lamp

No longer common

Higher voltage and power needed

Used a power inverter for DC to AC power

Added thickness to display"

LED acronym

Light Emitting Diode

Can have LEDs around the edge (diffused to light evenly) on smaller screens, or array of LEDs behind the screen on larger displays/TVs

LED arrays can be dimmed individually"

What do LCD displays require?

Backlight

Sometimes you may need to replace the LCD ______ or ________

inverter, display

What are digitizers for laptops, tablets, or hybrid devices typically used for?

stylus input or finger input

What is USB?

"high-speed wired communication

What is Micro-USB?

"smaller USB connection

What kind of devices may use Mini-USB (Mini B)?

Older devices

USB-C

24-pin double-sided USB connector

What are some of the signals that USB-C can transmit?

"DisplayPort

Thunderbolt"

Lighting Cable

8 pin digital signals"

What cable does lightning have advantages over?

What advantages does Lightning have over Micro-USB?

"higher power output for phones and tablets

simple design"

Different name for DB-9 cables

What is a DB-9 connector?

"commonly used for RS-232 signals

traditionally used for modem connections

uncommon nowadays"

NFC (acronym)

Near Field Communication

What is bluetooth?

a wireless PAN technology that transmits signals over short distances among cell phones, computers, and other devices

What is a hotspot?

a wireless network that provides Internet connections to mobile computers and devices

Functions of an Active Stylus / Digital Stylus

more advanced writing tool that has pressure sensitivity, programmable buttons, active stylus are typically specific to certain devices

Some laptops you are able to _______ trackpads.

disable

USB connections are common on laptops

connects to 3.5 mm TRRS (tip-ring-ring-sleeve) connector

analog audio jack

iPhone can use lightning port

can be used for bluetooth"

TRRS acronym

What is a TRRS connector?

Tip Ring Ring Sleeve connection that enables microphone and audio functionality

What is a port replicator?

A port replicator plugs into a single port (often USB) and offers additional ports

What are cells in cellular networking?

antenna coverage in a certain area

GSM- Global System for Mobile Communications

CDMA- Code Division Multiple Access"

What was the problem with 2g cellular networks?

"poor data support

GSM acronym

Global System for Mobile Communications

was originally an EU standard

was 90% of the market

used by AT&T and T-Mobile in the US

original GSM standard used multiplexing"

CDMA acronym

Code Division Multiple Access

each call uses a different code

the codes are used to filter each call on the receiving side

was used by Verizon and Sprint

handsets are controlled by the network provider

not much adoption around the world"

What is 3G technology?

3G received incremental updates that added several megabits per second"

The bandwidth upgrades that was included in 3G cellular technology was what?

mobile TV

video on demand"

What kind of technology is LTE?

a 4G technology

What did LTE (long term evolution) cellular technology accomplish?

converged GSM and CDMA providers onto one standard

How fast was the LTE standard?

150 Mbps

What is 5G?

fifth generation cellular networking introduced in 2020

IoT acronym

Internet of Things

How does 5G impact IoT (internet of things)?

bandwidth becomes less of a constraint and allows more devices on a network

PRL acronym (mobile devices)

Preferred Roaming List

Function of a hotspot on a smartphone

"turns your phone into a wireless router

What is Microsoft 365?

productivity cloud designed to help you run your business

What is network topology?

ethernet, DSL, switches, routers

TCP acronym (networking)

Transmission Control Protocol

What is UDP?

sends packets without verifying or checking for errors

TCP and UDP are _______ inside of IP

transported

What layer is TCP and UDP?

transport layer or layer 4

TCP and UDP provide _______ that IP can't provide alone

multiplexing

tcp/389

LDAP (Lightweight Directory Access Protocol)

tcp/110

POP3 (Post Office Protocol version 3)

tcp/25

SMTP (Simple Mail Transfer Protocol)

udp/161

SNMP (Simple Network Management Protocol)

tcp/22

SSH (Secure Shell)

udp/53

DNS (Domain Name System)

RAID 0

A RAID array in which every time data is written to disk, a portion (block) is written to each disk in turn, creating a "stripe" of data across the member disks. RAID 0 uses the total disk space in the array for storage, without protecting the data from drive failure.

RAID 1 + 0 aka RAID 10

A combination of RAID 1 and RAID 0 that requires at least four disks to work as an array of drives and provides the best redundancy and performance. Also called RAID 10.

Tone generator

An electronic device that sends an electrical signal through one set of UTP cables

Port flapping

describes a network interface that constantly transitions between connected and disconnected

"If a user powers on their computer and gets a ""Operating system not found"" error message, what should your next best troubleshooting step be?

A. Boot to safe mode

B. Replace the boot drive

C. Restore from a known good backup

D. Check for removable drives"

D. Check for removable drives (the OS would check a removable drive before a primary drive)

on an optical disc?

❍ A. Document archive

❍ B. Operating system boot files

❍ C. RAID parity files

❍ D. BIOS configurations"

A. Document archive

blank and the computer beeps twice. Which of these

would be the MOST likely cause of this issue?

❍ A. The boot device is not connected

❍ B. The memory is faulty

❍ C. The operating system has become corrupted

❍ D. The PC is infected with malware"

"A firewall is configured to block email transfers from

a remote server. Which of the following ports is the

firewall blocking?

❍ A. 443

❍ B. 22

❍ C. 23

❍ D. 25"

D. 25 (SMTP, Simple Mail Transfer Protocol)

in a conference room. The display on the laptop

works properly, but the projector image is constantly

flickering and pixelating. The technician has modified

the resolution and refresh rates, but the projector image

continues to flicker. Which of the following would be the

BEST next troubleshooting step?

❍ A. Replace the video cable

❍ B. Disable the laptop display

❍ C. Replace the projector bulb

❍ D. Power cycle the projector"

"The stylus on a Windows tablet will no longer interact

with the user interface. Which of these would be the

MOST likely cause of this issue?

❍ A. Digitizer

❍ B. Backlight

❍ C. Contrast

❍ D. Inverter"

A. Digitizer

a form on the laser printer on both sides of the page.

Which of the following options should be configured in

the accounting software?

❍ A. Collate

❍ B. Orientation

❍ C. Duplex

❍ D. Resolution"

C. Duplex