Mobile Device III

Your cellular carrier allows you to turn on a feature on your smartphone so that you can share its internet connection with other devices close to your smartphone. If you wanted to share the internet connection with multiple devices simultaneously, which feature would you enable?

• Mobile hotspot

• NFC

• Tethering

• Bluetooth

Answer explanation

A mobile hotspot can share that connection via Wi-Fi with nearby laptops, tablets, game consoles, or anything that can connect to a Wi-Fi network. This feature turns your smartphone into a Wi-Fi access point and then allows the other devices to connect to your smartphone and gain access to the internet. Tethering is another good option for this question, but tethering only supports a single device sharing the smartphone's internet connection at once. Tethering is the use of a mobile device’s cellular data plan to provide Internet access to a laptop or PC. The PC can be tethered to the mobile by USB, Bluetooth, or Wi-Fi. 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. 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. Near-field communication (NFC) 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.

You have been asked to replace the wireless 802.11ac card in an employee's laptop. Which of the following types of expansion cards is this?

• NVMe

• SODIMM

• PCIe

• miniPCIe

Answer explanation

Mini PCIe (mPCIe) are smaller form factor versions of standard PCI Express expansions cards used with laptops and other small form factor computing devices. Mini PCIe expansion cards provide the ability to add wireless networking or cellular data cards to a laptop. Non-volatile memory express (NVMe) is an interface for connecting flash memory devices, such as SSDs, directly to a PCI Express bus. NVMe allows much higher transfer rates than SATA/AHCI. PCI Express (PCIe) is an expansion bus standard using serial communications. Each device on the bus can create a point-to-point link with the I/O controller or another device. The link comprises one or more lanes (x1, x2, x4, x8, x12, x16, or x32). Each lane supports a full-duplex transfer rate of 250 MBps (v1.0), 500 MBps (v2.0), or 1 GBps (v3.0). A small outline dual inline memory module (SODIMM) can be purchased in various types and sizes to fit any laptop, router, or other small form factor computing device.

Which of the following form factors of storage devices are NOT used in laptops?

• 2.5"

• 3.5"

• 1.8"

• M.2

Answer explanation

A 3.5" drive is only used in desktops and some networked file servers. The larger 3.5" magnetic drives are the standard size used by desktop computers and do not fit into a laptop's smaller form factor. Laptops most commonly use 2.5" and 1.8" magnetic drives. In modern laptops, you will often find an M.2 form factor SSD installed.

Jason's son has broken the RJ-45 port of his laptop by sticking clay into it, and there are no wireless networks available in his office building. The manufacturer of the laptop said the port cannot be replaced for at least a week. Which of the following would be the MOST appropriate workaround to get the laptop connected to the wired network at Dion Training's office quickly?

• Purchase and use a USB to RJ-45 adapter

• Enable NIC teaming to increase your bandwidth

• Disable airplane mode and use the integrated 802.11ac adapter

• Replace the motherboard since it contains an integrated RJ-45 port

Answer explanation

Since the RJ-45 port on the laptop is most likely an integrated port on the motherboard, you will have to wait for the manufacturer to replace the motherboard for you. To get back onto the wired network at the office the quickest, you should purchase an external (USB) wired network adapter. These usually are small devices that will allow you to plug a wired network cable with an RJ-45 connector into the external adapter and connect it to the laptop using a USB port. This works just like the integrated RJ-45 adapter but can be installed in just a few seconds. Alternatively, you could use a port replicator or docking station if there was one available at the office. NIC teaming allows the grouping of multiple physical Ethernet network adapters into one or more software-based virtual network adapters for increased performance or fault tolerance. This would require multiple physical network interface cards to be installed in your laptop already, which is not the case in this scenario. Replacing the motherboard would work if you had one available, but the process can be time-consuming. It would be quicker and easier to simply use an external (USB) wired network interface adapter, instead. Airplane mode and 802.11ac adapters are used with wireless networks, therefore it cannot solve this issue since the office building does not have a wireless network available.

An employee at Dion Consulting is configuring their Android smartphone to synchronize their email with their corporate Office 365 account. What type of credentials will the employee need?

• Mail Protocols

• Domain Name

• Authentication code

• Email and Password

Answer explanation

o configure the email client on an Android device with an Office 365 account, the employee will need their email and password. Since Office 365 is a mainstream service, it is well supported on both Android and iPhone smartphones. If your company is running its own email servers, though, then you would be required to enter the domain name, appropriate mail protocols, and authentication codes.

You are troubleshooting a memory issue on a customer's laptop and have determined that the memory module needs to be replaced. You walk into the storage room to select a memory module to use as a replacement. Which of the following choices would be the MOST LIKELY choice for you to select for use on the laptop?

• Single Channel

• ECC

• SODIMM

• DDR4

Answer explanation

A small outline dual inline memory module (SODIMM) can be purchased in various types and sizes to fit any laptop, router, or other small form factor computing device. For the exam, if you are ever asked about installing memory in a small form factor device or a laptop, the answer will usually be SODIMM. Single-channel memory is any memory using one 64-bit bus between the CPU and the RAM. Error checking and correcting or error correcting code (ECC) is a type of system memory that has built-in error correction security. ECC is more expensive than normal memory and requires support from the motherboard. ECC is commonly used in production servers and not in standard desktops or laptops. Double data rate synchronous dynamic (DDR) random access memory is a standard for SDRAM where data is transferred twice per clock cycle to achieve a maximum data rate that is 64 times the bus speed in bps. There are various versions of DDR including DDR2, DDR3, DDR4, and DDR5.

Which of the following types of laptop displays would utilize a fluorescent backlight to illuminate the image?

• LCD

• Plasma

• LED

• OLED

Answer explanation

OBJ-1.2: A LCD (TFT) with fluorescent backlight has been the standard display technology for the last few years. The backlight is a fluorescent bulb that illuminates the image, making it bright and clear. An inverter supplies the correct AC voltage to the backlight from the laptop's DC power circuits. More modern laptops use LED displays that replace the fluorescent backlight with an LED backlight. OLED and plasma displays do not use a backlight.

A new smartphone supports users' ability to transfer a photograph by simply placing their phones near each other and "tapping" the two phones together. What type of technology does this most likely rely on?

• BT

• IR

• NFC

• RF

Answer explanation

Near-field communication (NFC) 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 (BT) 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. Radio frequency (RF) is the propagation of radio waves at different frequencies and wavelengths. For example, Wi-Fi network products use a frequency of either 2.4 GHz or 5 GHz.

Which of the following parts is responsible for converting the analog signals created by your tapping or swiping the surface of a display to a binary signal that is understood by the underlying software?

• Digitizer

• Backlight

• Inverter

• Capacitor

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. Analog signals are created when you tap or swipe the surface of the display. The digitizer is connected to the laptop with a flexible digitizer cable. A grid of sensors is activated when you tap or swipe the screen. The sensors' information is sent through the digitizer cable to a circuit that converts the analog signal to a digital signal using binary. A backlight is a fluorescent lamp used to illuminate the image on a flat panel (LCD) screen. If the backlight or inverter fails, the screen image will go very, very dark. 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 capacitor is an electrical component that stores electrical energy and is often used to regulate voltages. It can hold a charge after the power is removed.

Jason is teaching a CompTIA course at a large company, but they do not allow non-employees to connect to their network. Since Jason needs the Internet for an in-class demonstration, he connects his laptop to his iPhone using a USB cable. He essentially connects to the Internet using the smartphone as a modem. Which of the following terms best describes this configuration?

• Hotspot

• Tethering

• Tunneling

• Baseband update

Answer explanation

Tethering is the use of a mobile device’s cellular data plan to provide Internet access to a laptop or PC. The PC can be tethered to the mobile by USB, Bluetooth, or Wi-Fi. One method of doing this is to connect the laptop to the device using a USB cable, and then it can be used as a wired network connection. A portable hotspot is a dedicated mobile device that connects to a cellular network and provides a wireless (Wi-Fi) network for a small number of users. A tunneling (or encapsulation) protocol wraps up data from one protocol for transfer over a different type of network. For example, PPP can carry TCP/IP data over a dial-up line, enabling a remote computer to communicate with the LAN. A baseband update is the modification of the firmware of a cellular modem.