Comptia A+ certmaster Lesson 8 Supporting Mobile Devices

A hotspot is using the cellular data plan of a mobile device to provide internet access to a laptop or desktop.

A network technician is working from a coffee shop and does not want to use their insecure wireless connection. What can the technician enable on his smartphone to provide his laptop with his own Wi-Fi connectivity? Airplane mode Cellular data networking Hotspot Bluetooth

Some mobile-device cases provide a degree of waterproofing. Waterproofing is rated on the ingress protection (IP) scale. The first (6) is a rating for repelling solids. In this case, dustproof.

A traveling user looks to purchase a smartphone that has a high tolerance for differing environments. This includes indoor and outdoor use. What ingress protection (IP) rating does the user look for when wanting to protect the device from solids as best as possible? IP67 IP57 IP58 IPX8

The batteries in the keyboard have run down—replace them.

A user complains that their Bluetooth keyboard, which has worked for the last year, has stopped functioning. What would you suggest is the problem?

Poorly coded apps and malware can cause high resource usage which potentially leads to overheating problems for a device.

A user notices that a smartphone is not functioning properly as internal diagnostics show a majority of the RAM being used continuously with certain applications. What symptom should a technician look for? Power drain Resource usage Data usage Malware activity

Type of TFT display with the best overall quality, including wide viewing angles, good contrast ratio, and good response times (on premium units).

In-plane switching (IPS)

The fixed drive, system memory (RAM), and plug-in wireless card will be the easiest upgradable components to install. If items need repairing, the battery, touchpad, and the keyboard should be straightforward to replace, if you can obtain compatible parts.

Several laptops need to be replaced in the next fiscal cycle, but that doesn't begin for several months. You want to improve functionality as much as possible by upgrading or replacing components in some of the laptops that are having problems. Which items are most easily replaced in a laptop?

Type of low-cost TFT display with relatively poor viewing angles and contrast ratio, but good response times.

Twisted nematic (TN)

Type of TFT display with good viewing angles and excellent contrast ratio.

Vertical alignment (VA)

Mini-PCIe, mSATA, or M.2.

What type of standard adapter card might be used to connect internal FRU devices to the motherboard of a laptop?

LED or fluorescent lamp that illuminates the image on a flat-panel (TFT) screen. If the backlight component fails, only a dim image will be shown.

backlight

Power source for a portable computer, typically a rechargeable Lithium-ion (Li-ion) type. A small coin cell battery is also used in a computer to power CMOS RAM.

battery

Authentication mechanism that allows a user to perform a biometric scan to operate an entry or access system. Physical characteristics stored as a digital data template can be used to authenticate a user. Typical features used include facial pattern, iris, retina, fingerprint pattern, and signature recognition.

biometric authentication

Small, low-power lamps used both as diagnostic indicators, the backlight for a TFT display, and (as an organic LED array) in high-quality flat panels.

light-emitting diodes (LED)

Flat-panel display technology where the image is made up of liquid crystal cells with color filters controlled using electrical charges. The display must be illuminated by a backlight.

liquid crystal display (LCD)

Feature of mobile computing that identifies or estimates the device's geographical position using GPS and/or network data.

location service

Type of flat panel display where each pixel is implemented as an LED, removing the need for a separate backlight.

organic LED (OLED)

Feature of Bluetooth that establishes connectivity between two devices, often by entering a PIN.

pairing

A simple device used to extend the range of ports (for example, USB, DVI, HDMI, Thunderbolt, network, and so on) available for a laptop computer when it is used on a desk.

port replicator

Data that allows a CDMA-based handset to connect to nearby cell towers.

preferred roaming list (PRL)

Specific display technology used to implement modern flat-panel LCD displays.

thin film transistor (TFT)

Type of digital camera used to stream and record video. There are many types, from devices built into laptops to standalone units. While early devices were only capable of low resolutions, most webcams are now HD-capable.

webcam

A, B, C Before inserting or removing any battery pack, it is recommended and best to turn the machine off. This will prevent issues with the operating system and is a best practice for safety. When working on a laptop to replace any physical component, it is recommended to unplug the laptop from the AC wall outlet for safety purposes. Discharging a battery will drain what available charge remains. This is not a required step when replacing a laptop battery.

A Windows-based laptop has an internal battery that requires tools to access and remove. What steps must a repair technician take prior to opening the laptop to install a replacement? (Select all that apply.) Discharge the battery. Power the laptop off. Disconnect the AC power. Charge the battery.

Mobile application management (MAM) allows an enterprise to create a protected container as a workspace for corporate apps and data and prevent copying to other storage areas.

A company has discovered that an employee has been emailing product design documents to her smartphone and then saving the files to the smartphone's flash drive. Which technology can be deployed to prevent such policy breaches? Mobile device management (MDM) Mobile application management (MAM) Mobile device security management (MDSM) Secure mobile management (SMM)

Vertical alignment (VA) displays support good viewing angles and high-contrast ratios, which makes them well-suited to displaying slides to an audience. The twisted nematic (TN) type is cheap but does not support wide-angle viewing.

A company is ordering custom-built laptops to supply to its field sales staff for use predominantly as presentation devices. The company can specify the type of panel used and has ruled out IPS and OLED on cost grounds. Which of the remaining mainstream display technologies is best suited to the requirement? Vertical alignment (VA) Twisted Nematic (TN) LED IOS

Long-term evolution (LTE) is a packet data communications specification providing an upgrade path for both GSM and CDMA cellular networks. LTE Advanced provides 4G standard network access with SIM cards. Most 4G networks have moved to LTE.

A company uses cell phones that do not have SIM cards and can only be managed by a specific network provider. The company wants to buy 4G cell phones that have SIM cards so they can switch to any chosen provider. What network type best suits the company's needs? LTE GSM CDMA PRL

The user could be touching the touchpad while typing, or vibrations could be affecting the touchpad. Update the driver or reduce the sensitivity/disable touch and tap events.

A laptop user is complaining about typing on their new laptop. They claim that the cursor jumps randomly from place to place. What might be the cause of this?

Batteries lose maximum charge over time. It may be possible to recondition the battery or to use power-saving features, but the only real way to restore maximum battery life is to buy a new battery.

A laptop user reports that they are only getting about two hours of use out of the battery compared to about three hours when the laptop was first supplied to them. What do you suggest?

Global Positioning System (GPS) is a means of determining the device's latitude and longitude based on information received from orbital satellites via a GPS sensor.

A mobile device user is traveling out of the area and left their device somewhere outside. The user wants to track where they last had their mobile device in order to retrace their steps and find the device. Which of the following options is the system that relies solely on satellite communication to pinpoint a device's location and help the user find their device? Geolocation Location Service Near Field Communication Global Positioning System

In-plane switching (IPS) uses crystals that rotate rather than twist. The main benefit is to deliver better color reproduction at a wider range of viewing angles making it the best TFT option for graphics design work.

A network technician is purchasing new displays for the graphics design team. Which type of thin-film transistor (TFT) will be optimal for supporting that type of work? TN Digitizer In-plane switching VA

Smartphones have both front-facing and rear-facing camera lenses, both of which can function either as a still camera or as a webcam for video recording and streaming. Tablets have both front-facing and rear-facing camera lenses, both of which can function either as a still camera or as a webcam for video recording and streaming.

A network technician trains a new employee on the company devices they received during orientation. Which devices will have both a front and rear camera? (Select all that apply.) Digital camera Smartphone Tablet Webcam

A 3.5" disk drive is the traditional drive size that is used in computer systems. These are magnetic drives.

A non-tech savvy laptop user orders a new hard drive from a large online retailer to install in the laptop. When the drive arrives, the user discovers that it is physically too big to install. What size drive did the user order? 1.8 in. 9.5 mm 7 mm 3.5 in.

This type of flat data connector is secured by a latch. Pop the latch up before trying to remove the cable.

A technician is performing a keyboard replacement and asks for your help. The data cable for the old keyboard will not pull out. How should it be removed?

An M.2 SSD usually interfaces with the PCI Express bus, allowing much higher bus speeds than SATA. M.2 adapters can be of different lengths.

A technician needs to replace a solid-state drive (SSD) in a user's laptop. The technician requested the purchasing department to order a drive that has higher bus speeds than other SSDs and fits into a PCI Express bus when incorporating the appropriate adapter. Which drive type does the purchasing department order? M.2 mSATA SATA uSATA

A mini-DIMM has a smaller form factor than a small outline DIMM (SODIMM) form factor and is used in compact and ultraportable devices. A micro-DIMM has a much smaller form factor than a small outline DIMMs (SODIMM). A micro-DIMM is used with ultraportable devices.

A technician plans a memory upgrade for a fleet of computers for sales users. When evaluating the various types of memory modules, what module types are commonly used for ultraportable laptops? (Select all that apply.) DIMM SODIMM Mini-DIMM Micro-DIMM

The owner of a mobile device configures an account when they use the device for the first time. This account manages the apps installed on the device and represents the user on the app store.

A user purchased their first smartphone and wants to download useful apps to it. What must the user do before they can use the app store? Grant privileges. Synchronize between multiple devices. Autodiscover. Configure an account.

In an organic light-emitting diode (OLED) display, or technically an advanced matrix OLED (AMOLED), the panel does not require a separate backlight but the screen is darker and images burn into the screen easier.

A user returned a new laptop to the helpdesk with complaints that the screen was too dark and that the desktop image they put on it burned into the display. What kind of display does the laptop most likely have? Touch screen LED TFT OLED

A, B, C An improper charging routine will reduce the usable life of a battery. Following manufacturer instructions on the proper charging and discharging of the battery is recommended. Making use of power management features included with a device/OS to prolong battery life is a good practice. As batteries age, the maximum charge they can sustain decreases, so short battery life will usually indicate that the battery needs replacing. Symptoms such as the touch screen not responding to input indicate a problem with the digitizer. This would not affect battery life.

A user states that a mobile phone does not hold a very good charge. What might the cause be? (Select all that apply.) Improper battery charging Lack of power management An aging battery Unresponsive digitizer

A, B, and C On a laptop, if touchpad sensitivity is too high, typing can cause vibrations that move the cursor. A sensitivity setting can adjust mouse behavior. On a laptop, the user's hand placement may hover extremely close to the touchpad, thus causing the mouse to move while typing. Although not ideal, the help desk can disable the touchpad either through software or a function key on the laptop. It is possible that a driver update is required for the mouse to behave normally. Software drivers often fix glitches and provide updates to functionality. A keyboard replacement is not likely an action the help desk would take. Although typing on the keyboard is causing the issue, the problem is more likely to be with the touchpad.

A user utilizing an external mouse complains that when typing on a laptop keyboard, the cursor slowly moves across the screen. What actions can the help desk perform to prevent this behavior from happening? (Select all that apply.) Adjust the sensitivity setting. Disable the touchpad. Update the driver. Replace the keyboard.

If a laptop does not have an integrated fingerprint scanner, it is possible to obtain models that connect to a universal serial bus (USB) port. An external webcam may also be used.

A user would like to take advantage of biometric technology for a quicker and more secure login to a laptop. The user discovers the laptop has no built-in technology for biometrics. What solution does the IT department offer? Near-field scanner USB peripheral device Keyboard replacement Touchpad replacement

B, C, D A fingerprint reader is an example of an authentication mechanism that allows a user to perform a biometric scan to operate an entry or access system. Facial recognition is a biometric authentication method stored as a digital data template, and a smartphone can use it to authenticate a user. Voice recognition is an additional method of biometric authentication. A personal identification number (PIN) is not a biometric authentication method, but the user can use it as an authentication method or as part of two-factor authentication (2FA).

A user's device allows them to bypass the screen lock using biometric authentication. Which of the following are biometric authentication methods the user can configure? (Select all that apply.) PIN Fingerprint reader Facial recognition Voice recognition

Dust trapped in laptop cooling vents acts as an insulator and can prevent proper cooling. It can also slow or stop the fan. The vents are likely the issue due to the warehouse environment.

A warehouse user reports an issue with a laptop to the IT helpdesk. The issue is that the laptop becomes very hot after only a few minutes of use whether it is plugged in or not. The user states that laptop use is under the usual circumstances. What does IT conclude the likely problem to be? Faulty AC adapter Battery discharging Dust and debris Room temperature

When configuring corporate email, the user will enter the fully qualified domain name (FQDN) or IP address of the Internet Mail Access Protocol (IMAP) or Post Office Protocol (POP3) server. When configuring corporate email, the user will enter the IP address or the FQDN of the Internet Mail Access Protocol (IMAP) or Post Office Protocol (POP3) server.

An organization that does not support the autodiscovery feature for email servers is deploying new phones to its team. A user is configuring an email server on their new device. What options might the user enter in the incoming mail server field to implement a proper configuration? (Select all that apply.) FQDN IP address SMTP server address Ports

Feature of mobile computing that provides a managed interface for installing third-party software apps.

App Store

MDM Mobile device management (MDM) sets device policies for authentication, feature use (camera and microphone), and connectivity. MDM can also allow device resets and remote wipes. An app store is a feature of mobile computing that provides a managed interface for installing third-party software apps. Enterprise mobility management (EMM) is a class of management software designed to apply security policies to the use of mobile devices and apps in the enterprise. Mobile application management (MAM) sets policies for apps that can process corporate data and prevents data transfer to personal apps.

Enterprises use different deployment models to specify how they provision mobile devices and apps for employees. Which function of enterprise management allows the organization to perform remote wipes on devices? App store EMM MDM MAM

Means of determining a receiver's position on Earth based on information received from orbital satellites.

Global Positioning System (GPS)

Mobile/cloud computing office productivity and data storage suite operated by Google.

Google Workspace

Just select the provider then enter the email address. If the account is detected, you will be prompted for the password.

How do you configure an autodiscover-enabled email provider on a smartphone? Enter your email address and password and select auto discovery. Email your phone manufacturer with you email and password and they will remotely configure it for you. Download and app that can handle email autodiscovery. Just select the provider then enter the email address. If the account is detected, you will be prompted for the password.

The graphics adapter is working. The problem must exist either in the cabling to the built-in screen or with a screen component, such as an inverter, backlight, or the display panel itself. Further tests will be required to identify which.

If the laptop can display an image on an external monitor but not on the built-in one, which component do you know is working, and can you definitively say which is faulty?

Packet data communications specification providing an upgrade path for both GSM and CDMA cellular networks. LTE Advanced is designed to provide 4G standard network access.

Long Term Evolution (LTE)

Mobile/cloud computing office productivity and data storage suite operated by Microsoft.

Microsoft 365

Enterprise management function that enables control over apps and storage for mobile devices and other endpoints.

Mobile application management (MAM

Process and supporting technologies for tracking, controlling, and securing the organization's mobile infrastructure.

Mobile device management (MDM)

Sometimes synonymous with touch pad, but also a touch interface provisioned as a peripheral device, often dedicated to use with digital art applications.

Trackpad

True

True or false? The M.2 form factor uses a retaining screw to secure the card.

Verify that the DDR version of the upgrade module is supported by the motherboard. Take antistatic precautions. Locate the memory slot, which is usually accessed via a panel on the back cover. Move the connector up to 45º and insert the memory card, taking care to align it correctly. Push the card flat again.

What is the process for installing memory in a laptop?

For Apple devices, the Lightning port. For Android, it will be USB-C.

What type of peripheral port would you expect to find on a current generation smartphone? USB-C Lightning port Micro-USB Mini-USB

VGA

Which of the following port types is NOT provisioned on the dock? Power RJ-45 DisplayPort HDMI VGA USB

Contacts and calendar items.

Which types of data might require mapping between fields when syncing between applications? Contacts and Birthdays Contacts and calendar items. Calendar and Billing Information None of the above.

Bluetooth

Which wireless interface could be used to connect peripheral input devices to the laptop if a dock is not available? Bluetooth Port replicator Ethernet Wi-Fi NFC

A vendor account, such as an Apple, Google, or Samsung account, is required to use the app store.

Why must a vendor account usually be configured on a smartphone? A vendor account, such as an Apple, Google, or Samsung account, is required to use the app store. The account is needed to connect to your cellular wireless network. It helps improve the experience. There is no need for it. Its purely a convenience account that Apple, Google, and Samsung have you create.

On the smartphone, open the Bluetooth page under Settings. This will make the phone discoverable and enable the user to find nearby devices. If the headset is not found automatically, check if there is a button on the headset to make it discoverable.

You are assisting a user with pairing a smartphone to a Bluetooth headset. What step must the user take to start the process?

Near-field communications (NFC) allow the user to touch the phone to a point-of-sale terminal to authorize payment in conjunction with a wallet app.

You are identifying suitable smartphone models to issue to field sales staff. The models must be able to use digital payments. What type of sensor must the devices have? Bluetooth (BT) Airplay Near-field communications (NFC) Wireless Pay-As-You-Go (WPAYG)

Display cable The built-in

You are troubleshooting a laptop display. If the laptop can display an image on an external monitor but not on the built-in one, which components can you say are faulty? You are troubleshooting a laptop display. If the laptop can display an image on an external monitor but not on the built-in one, which components can you say are faulty? CPU Display cable The built-in GPU

Configuring a hotspot allows the laptop to connect to the smartphone over Wi-Fi. Tethering means connecting the laptop via USB or Bluetooth.

You are writing a knowledge base article for remote staff members who need to use their smartphones to provide Internet connectivity to their laptops. Two options to facilitate this include configuring a hotspot or the use of tethering. What distinguishes the two options? Tethering means linking connections together via VPN. Configuring a hot spot is actually a security technique and unrelated. Tethering means connecting the laptop via USB or Bluetooth. Configuring a hotspot allows the laptop to connect to the smartphone over Wi-Fi.

Overheating can be a sign that dust and dirt is restricting the necessary airflow within the device, so start by cleaning the ventilation duct with compressed air, and then make sure that the device is getting proper air circulation around the outside of the case, such as by supplying a chiller pad.

You received a user complaint about a laptop being extremely hot to the touch. What actions should you take in response to this issue? Reapply thermal paste to CPU Cleaning Ventilation Reapply thermal paste to GPU Replace heat spreader on the CPU

A toggle found on mobile devices enabling the user to disable and enable wireless functionality quickly.

airplane mode

Feature of mobile computing that allows use of a network connection to be limited to avoid incurring additional carrier charges.

data caps

Version of a 35 mm film camera where the film is replaced by light-sensitive diodes and electronic storage media (typically a flash memory card). The sensitivity of the array determines the maximum resolution of the image, measured in megapixels. Most mobile devices are fitted with embedded cameras that can function as both still and video cameras.

digital camera

As part of a touch screen assembly, the digitizer is a touch-sensitive layer placed on top of the display panel. The digitizer converts analog touch and gesture events to digital signals that can be interpreted as different types of input.

digitizer

Advanced type of port replicator designed to provide additional ports (such as network or USB) and functionality (such as expansion slots and drives) to a portable computer when used at a desk.

docking station

Peripheral device supporting audio input (microphone) and output (speaker headphones).

headset

Using the cellular data plan of a mobile device to provide Internet access to a laptop or PC. The PC can be tethered to the mobile by USB, Bluetooth, or Wi-Fi (a mobile hotspot).

hotspot

Mobile/cloud computing office-productivity and data-storage suite operated by Apple and closely integrated with macOS and iOS.

iCloud

Fluorescent lamp backlights require AC power. An inverter component converts DC power from the motherboard to AC. The inverter can fail separately to the backlight.

inverter

Input device that can be used with a compatible digitizer/track pad/drawing tablet for natural input, such as handwriting and sketching.

touch pen

A display screen combined with a digitizer that is responsive to touch input.

touch screen

Strong authentication mechanism that requires a user to submit two different types of credential, such as a fingerprint scan plus PIN. Often, the second credential is transmitted via a second trusted device or account. This is also referred to as 2-step verification.

two-factor authentication (2FA)

Controller that can send and receive data in an asynchronous serial format.

universal asynchronous receiver transmitter (UART)