Mobile devices I

Dion Consulting Group is working with a new laptop manufacturer. The manufacturer wants to create the thinnest and lightest laptops in the world. To do this, they need to choose the right technology for their displays. Which technology should Dion Consulting recommend to allow for the thinnest laptop displays?

• LCD

• IPS

• LED

• OLED

Answer explanation

An OLED display works without a backlight because it emits visible light. Thus, it can display deep black levels and be thinner and lighter than a liquid crystal display (LCD). In low ambient light conditions (such as a darker room), an OLED screen can achieve a higher contrast ratio than an LCD, regardless of whether the LCD uses cold cathode fluorescent lamps or an LED backlight. An in-plane switching (IPS) LCD panel uses technology designed to resolve the quality issues inherent in TN panel technology, including strong viewing angle dependence and low-quality color reproduction. A liquid crystal display (LCD) panel is a type of display technology where the image is made up of liquid crystal cells controlled using electrical charges. The LCD panel is backlight by a cold cathode fluorescent (CCFL) bulb. LCD panels are used on laptops and have replaced CRT monitors as the main type of computer display screen for desktops, as well. A light-emitting diode (LED) display is an LCD panel that uses a LED backlight instead of a CCFL backlight to provide its light source.

Which of the following locations are you likely to find the antenna wires located within a laptop or mobile device?

• Located under the keyboard

• Laying on top of the battery

• Connected externally via USB

• Positioned around the display panel

Answer explanation

The antenna wires for the wireless cards and cellular radios are usually routed around the screen within the casing of the laptop or mobile device. The antenna connections can be tricky to install/remove and are delicate. When updating or replacing a wireless or cellular card, the technician must be careful to reconnect the antenna wires and reinstall them in the proper location. External antennas are available only when connected to an external wireless card.

Which of the following synchronization methods does NOT work with Android devices?

• Office 365

• Google Workspace

• iTunes

• Flickr

Answer explanation

Android can not use iTunes to perform synchronization functions. The iTunes application only works with Apple devices, such as iPhones and iPads. Android devices can use Google Workspace with Gmail to sync emails and contacts. Android devices can also use Office 365 to sync emails, contacts, and other files if you are a Microsoft subscriber. Android devices can use Flickr to sync photos.

Both Apple and Samsung have released their own version of contactless mobile payment solutions. For example, Apple Pay allows users to place their iPhone or Apple Watch within an inch of a credit card machine at a store to make a payment. Which of the following wireless technologies do these types of payment systems rely upon?

• Wi-Fi

• NFC

• Bluetooth

• Infrared

Answer explanation

NFC, or near-field communication, is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm of each other. This is commonly used for contactless payment systems, transferring contacts, or transferring a file from one device to another. Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using UHF radio waves in the industrial, scientific, and medical radio bands from 2.402 GHz to 2.480 GHz and building a personal area network (PAN). Bluetooth is commonly used when connecting wireless devices like mice, trackpads, headphones, and other devices. Infrared (IR) was a wireless networking standard supporting speeds up to about 4 Mbps with a direct line of sight for communications. Infrared sensors are used in mobile devices and with IR blasters to control appliances. While infrared (IR) used to be commonly used to connect wireless mice and keyboards to a laptop in the 1990s, it has fallen out of favor in the last 10-15 years since Bluetooth is more reliable and does not require a direct line of sight between the device and the laptop. Wi-Fi is the IEEE 802.11 standard for wireless networking based on spread spectrum radio transmission in the 2.4 GHz and 5 GHz bands. The standard has six main iterations (a, b, g, n, ac, and ax), describing different modulation techniques, supported distances, and data rates.

You have been asked to set up the corporate email on several mobile devices for Dion Training's employees. The employees will use their mobile devices to check their email when out of the office, but they will also need to check their email from their desktop computers. Which of the following mail protocols should you configure to allow the employees to receive their mail and maintain the read/unread status across all of their devices?

• SMTP

• HTTPS

• POP3

• IMAP

Answer explanation

ou should configure IMAP because it will leave the email on the server and allow for synchronizing the mail to all devices, including each email's read state. If you configure POP3, the mail is downloaded to the device and removed the mail from the server's mailbox by default. SMTP is used to send emails, not receive them. HTTPS is used for web browsing, not for receiving emails. The post office protocol (POP3) is a TCP/IP application protocol providing a means for a client to access email messages stored in a mailbox on a remote server over port 110. The server usually deletes messages once the client has downloaded them. The internet message access protocol (IMAP) is a TCP/IP application protocol that provides a means for a client to access email messages stored in a mailbox on a remote server using TCP port number 143. Unlike POP3, messages persist on the server after the client has downloaded them. IMAP also supports mailbox management functions, such as creating subfolders and access to the same mailbox by more than one client at the same time. The simple mail transfer protocol (SMTP) is the protocol used to send mail between hosts on the Internet using TCP port 25. The hypertext transfer protocol secure (HTTPS) is a secure protocol used to provide web content to browsers using SSL/TLS encryption over port 443.

Which cellular technology is comprised of HSPA+ and EV-DO to provide higher data speeds than previous cellular data protocols?

• 5G

• 4G

• LTE

• 3G

Answer explanation

3G cellular technology is made up of two different technologies: HSPA+ and EV-DO. HSPA+ (Evolved High-Speed Packet Access) is a 3G standard used for GSM cellular networks and can support up to a theoretical download speed of 168 Mbps and a theoretical upload speed of 34 Mbps. In the real world, though, HSPA+ normally reaches speeds around 20 Mbps. EV-DO (Evolution-Data Optimized) is a 3G standard used for CDMA cellular networks and can support up to 3.1 Mbps downloads. 4G cellular technology is made up of LTE and LTA-A. Long Term Evolution (LTE) is a packet data communications specification providing an upgrade path for both GSM and CDMA2000 cellular networks. LTE has a theoretical speed of 150 Mbps and a real-world speed of around 20 Mbps. LTE Advanced (LTE-A) has a theoretical speed of 300 Mbps and a real-world speed of around 40 Mbps. 5G cellular technology is made up of three different types: low-band, mid-band, and high-band mmWave technology. Low-band 5G reaches an average speed of 55 Mbps with a theoretical speed of 150 Mbps. Mid-band 5G reaches an average speed of 150 Mbps with a theoretical speed of 1.5 Gbps. High-band 5G reaches an average speed of 3 Gbps with a theoretical speed of up to 70 Gbps.

A customer recently purchased a touchscreen laptop to use for her schoolwork. It has been working well for about 3 weeks, but today she has brought it into your store for repair because it is not working properly. When she touches an icon on the screen, the program fails to load. You look over the laptop, and the screen appears to be fully intact with no dark blobs or spider web cracks in the panel. You attempt to operate the laptop using the touchscreen, but it appears non-responsive to your touch. You can, however, click on the icons using the laptop's touchpad without any issues. Which of the following components MOST likely needs to be replaced?

• Inverter

• LCD panel

• GPU

• Digitizer

Answer explanation

The digitizer is a touch-sensitive glass panel covering the LCD in a touchscreen assembly. The digitizer is used to convert touch events to digital signals that can be interpreted as different types of input. The digitizer can be touched and inspected without taking apart the device. A liquid crystal display (LCD) panel is a type of display technology where the image is made up of liquid crystal cells controlled using electrical charges. The LCD panel is backlight by a cold cathode fluorescent (CCFL) bulb. LCD panels are used on laptops and have replaced CRT monitors as the main type of computer display screen for desktops, as well. The LCD screen is the panel that is inside the device, which displays the image. You cannot get to the LCD without taking the device apart first. When only the touch screen is broken, you should still see what is happening on the screen, and the screen should still function as normal. When only the LCD is broken, you can still use the touchscreen, but the panel will have dark blobs or spider web cracks (or both). When both LCD and touchscreen are damaged, you may still be able to use portions of the touchscreen, and some parts of the LCD may display the image, but you will incur obvious difficulties in using the device as normal. The inverter (also known as inverter board, screen inverter, or LCD inverter) is a part of the laptop's display assembly. The inverter is a small green board attached to the base of the LCD panel. In a laptop computer, the LCD screen relies on a backlight source to uniformly light up the screen, and the inverter acts as the power supply for this lighting source. If the inverter is faulty, the display will be too dim to easily see without an external light source like a flashlight. A graphics processing unit (GPU) is a microprocessor used on dedicated video adapter cards or within a CPU with integrated graphics capability to handle the mathematical calculations required to create immersive and 3D graphics.

You have been asked to set up the corporate email on several mobile devices for Dion Training's employees. The employees will use their mobile devices to send their emails when out of the office. Which of the following mail protocols should you configure to allow the employees to send their mail?

• IMAP

• POP3

• HTTPS

• SMTP

Answer explanation

You should configure SMTP since it is the only protocol used to send emails. POP3 and IMAP are used to receive emails. HTTPS is used for web browsing, not for receiving emails. The post office protocol (POP3) is a TCP/IP application protocol providing a means for a client to access email messages stored in a mailbox on a remote server over port 110. The server usually deletes messages once the client has downloaded them. The internet message access protocol (IMAP) is a TCP/IP application protocol that provides a means for a client to access email messages stored in a mailbox on a remote server using TCP port number 143. Unlike POP3, messages persist on the server after the client has downloaded them. IMAP also supports mailbox management functions, such as creating subfolders and access to the same mailbox by more than one client at the same time. The simple mail transfer protocol (SMTP) is the protocol used to send mail between hosts on the Internet using TCP port 25. The hypertext transfer protocol secure (HTTPS) is a secure protocol used to provide web content to browsers using SSL/TLS encryption over port 443.

Which of the following devices have most of the same functionality as a personal computer but can be operated with a single hand?

• Smartwatch

• Tablet

• Laptop

• Smartphone

Answer explanation

A smartphone is a device with roughly the same functionality as a personal computer operated with a single hand. Most smartphones have a screen size between 4.5" and 5.7". Leading smartphones provide high-resolution screens. Smartphones have fast multicore CPUs, anywhere between 2 and 6 GB system memory, and 16 GB+ flash memory storage. They come with premium front and back digital cameras, input sensors like accelerometers, and Global Positioning System (GPS) chips. They can establish network links using Wi-Fi and a cellular data plan. A high-end smartwatch (for example, an Apple Watch) will allow the user to see their notifications, chat activity, and even make phone calls. A mid-range or low-end smartwatch can still have the ability to read your chat and notifications, but you may be unable to make phone calls from it. A smartwatch is not a replacement for a laptop or desktop, but a high-end smartphone can be.

Tim, a help desk technician, receives a call from a frantic executive who states that their company-issued smartphone was stolen during their lunch meeting with a rival company’s executive. Tim quickly checks the MDM administration tool and identifies that the user’s smartphone is still communicating with the MDM, and displays its location on a map. What should Tim do next to ensure the stolen device's data remains confidential and inaccessible to the thief?

• Identify the IP address of the smartphone

• Reset the device's password

• Perform a remote wipe of the device

• Remotely encrypt the device

Answer explanation

To ensure the data remains confidential and is not accessed by the thief, Tim should perform a remote wipe of the device from the MDM. This will ensure any corporate data is erased before anyone accesses it. Additionally, Tim could reset the device's password, but if the thief can guess or crack the password, they would have access to the data. Identifying the smartphone's IP address is not a useful step in protecting the data on the device. Additionally, devices should be encrypted BEFORE they are lost or stolen, not after. Therefore, the option to remotely encrypt the device is provided as a wrong answer and a distractor.