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Question 261

Which cloud service model provides virtual machines, storage, and networking resources while allowing the customer to manage the operating system?

1. SaaS
2. IaaS
3. PaaS
4. DaaS

Correct Answer: 2

Explanation

Infrastructure as a Service, or IaaS, provides virtualized computing resources such as virtual machines, storage, and networking. The customer generally manages the operating system, applications, and other software while the cloud provider manages the underlying physical infrastructure. SaaS provides ready-to-use applications, while PaaS provides a managed platform for application development. DaaS can refer to Desktop as a Service. Therefore, IaaS is the cloud service model that provides infrastructure resources while leaving operating-system management to the customer.

Question 262

Which virtualization component creates and manages virtual machines on a physical computer?

1. Hypervisor
2. Bootloader
3. File system
4. Device driver

Correct Answer: 1

Explanation

A hypervisor is software or firmware that creates and manages virtual machines by allocating physical system resources such as CPU time, memory, storage, and network connectivity. Type 1 hypervisors run directly on physical hardware, while Type 2 hypervisors run on top of a host operating system. A bootloader starts an operating system, a file system organizes stored data, and a device driver enables communication with hardware. Therefore, the hypervisor is responsible for managing virtual machines.

Question 263

Which mobile-device feature allows a phone to share its cellular internet connection with other nearby devices?

1. Screen mirroring
2. NFC
3. Mobile hotspot
4. Bluetooth pairing

Correct Answer: 3

Explanation

A mobile hotspot allows a smartphone or other cellular device to share its cellular data connection with nearby computers, tablets, or other compatible devices. The phone typically creates a Wi-Fi network that other devices can join, although some implementations can also use USB or Bluetooth tethering. Screen mirroring transfers display content, NFC provides very short-range communication, and Bluetooth pairing connects compatible peripherals or devices. Therefore, a mobile hotspot is the feature designed to share a cellular internet connection.

Question 264

Which mobile-device security feature prevents unauthorized users from accessing the device after the screen has been inactive?

1. Screen lock
2. Airplane mode
3. Auto-brightness
4. Screen rotation

Correct Answer: 1

Explanation

A screen lock requires the user to authenticate before accessing the mobile device after it has been locked. Authentication can involve a PIN, password, pattern, fingerprint, facial recognition, or another supported method. Screen locking reduces the risk of unauthorized access when a phone or tablet is lost, stolen, or left unattended. Airplane mode disables or restricts wireless communication, auto-brightness adjusts display brightness, and screen rotation changes display orientation. Therefore, screen lock provides the described access protection.

Question 265

Which printer technology uses an impact print head with pins striking an ink ribbon?

1. Laser
2. Inkjet
3. Thermal
4. Dot matrix

Correct Answer: 4

Explanation

A dot matrix printer uses an impact print head containing small pins that strike an inked ribbon against paper to create characters and images. This technology can be useful for multipart forms because the physical impact can transfer information through multiple layers of paper. Laser printers use toner and a photoconductive drum, inkjet printers spray liquid ink, and thermal printers use heat-sensitive media or thermal transfer mechanisms. Therefore, dot matrix is the printer technology that uses pins striking an ink ribbon.

Question 266

Which laptop component is primarily responsible for converting stored electrical energy into power for the system when no AC adapter is connected?

1. Battery
2. Heat sink
3. CMOS chip
4. Display panel

Correct Answer: 1

Explanation

A laptop battery stores electrical energy and supplies power to the system when the computer is operating without an external AC adapter. Rechargeable lithium-ion and lithium-polymer batteries are commonly used in modern laptops and mobile devices. The battery management system monitors charging, temperature, and other operating conditions to help maintain safe operation. A heat sink removes heat, the CMOS circuitry supports firmware-related functions, and the display panel produces visual output. Therefore, the battery provides the stored electrical energy used during mobile operation.

Question 267

Which wireless feature allows a compatible smartphone to display its screen on a supported external display or television?

1. Tethering
2. Screen mirroring
3. GPS
4. NFC

Correct Answer: 2

Explanation

Screen mirroring allows the content displayed on a smartphone or tablet to be reproduced on a compatible television, monitor, or other display device. Depending on the platform, technologies such as Miracast or proprietary wireless display systems may be used. Tethering shares a network connection, GPS provides location information, and NFC enables very short-range communication. Screen mirroring can be useful for presentations, viewing photographs, streaming supported content, or demonstrating applications on a larger screen. Therefore, screen mirroring provides the described functionality.

Question 268

A smartphone becomes unusually hot while charging and the battery begins draining rapidly. Which action should be taken first?

1. Continue charging until the battery reaches 100 percent
2. Disable the screen lock
3. Stop charging and inspect the charger, cable, and battery condition
4. Increase screen brightness

Correct Answer: 3

Explanation

Excessive heat combined with rapid battery drain can indicate a faulty charger, damaged cable, battery problem, excessive workload, or another hardware issue. The safest initial response is to stop charging and inspect the charging equipment and device condition rather than continuing to expose the battery to possible overheating. If the battery appears swollen, damaged, or unusually hot, it should not be handled unnecessarily. Increasing screen brightness would increase power consumption, while disabling the screen lock would not address the underlying issue. Therefore, stopping charging and inspecting the equipment is appropriate.

Question 269

Which cloud service model provides users with a complete application that is managed primarily by the service provider?

1. SaaS
2. IaaS
3. PaaS
4. Colocation

Correct Answer: 1

Explanation

Software as a Service, or SaaS, provides a complete software application through the cloud while the provider manages most of the underlying infrastructure, platform, and application maintenance. Users generally access the application through a browser or client and have limited responsibility for servers and operating systems. IaaS provides infrastructure resources, while PaaS provides a managed platform for application development and deployment. Colocation involves placing customer-owned equipment in a third-party facility. Therefore, SaaS is the model described.

Question 270

Which network technology is commonly used to provide short-range wireless communication between a smartphone and a wireless headset?

1. NFC
2. Bluetooth
3. GPS
4. Cellular LTE

Correct Answer: 2

Explanation

Bluetooth is commonly used for short-range wireless communication between smartphones and peripherals such as headsets, keyboards, mice, speakers, and vehicle systems. It is designed for personal-area connectivity and typically consumes relatively little power compared with many longer-range wireless technologies. NFC operates at a much shorter range and is commonly used for contactless transactions or quick pairing, while GPS provides positioning information and cellular networks provide wide-area connectivity. Therefore, Bluetooth is the appropriate technology for connecting a smartphone to a wireless headset.

Question 271

Which mobile-device connection method can provide network connectivity by connecting the smartphone directly to a computer with a cable?

1. NFC
2. USB tethering
3. Screen mirroring
4. GPS

Correct Answer: 2

Explanation

USB tethering allows a smartphone to share its cellular data connection with a computer through a USB cable. The computer uses the phone as a network connection, which can be useful when Wi-Fi is unavailable or when a wired connection is preferred. NFC is intended for very short-range communication, screen mirroring transfers display content, and GPS provides location information. USB tethering can also provide a stable physical connection while simultaneously charging some devices. Therefore, USB tethering provides the described network-sharing capability.

Question 272

Which printer component is responsible for drawing paper from the input tray into the printer?

1. Fuser
2. Imaging drum
3. Pickup roller
4. Transfer roller

Correct Answer: 3

Explanation

The pickup roller pulls sheets of paper from the input tray and feeds them into the printer’s paper path. If the roller becomes worn, dirty, or damaged, the printer may experience paper-feed failures or repeated attempts to pick up a sheet. The imaging drum is involved in forming the toner image in laser printing, the transfer roller helps move toner toward the paper, and the fuser permanently bonds toner to the page. Therefore, the pickup roller performs the initial paper-feeding function.

Question 273

Which type of display uses a liquid crystal layer and requires a backlight to produce visible images?

1. OLED
2. LCD
3. Plasma
4. E-ink

Correct Answer: 2

Explanation

LCD, or Liquid Crystal Display, technology uses a liquid crystal layer to control how light passes through individual pixels. Traditional LCD panels require a separate backlight, commonly using LED-based illumination in modern displays. OLED panels differ because their individual pixels emit their own light, eliminating the need for a conventional backlight. Plasma displays use electrically excited gas cells, while e-ink displays use electrophoretic particles designed primarily for low-power reflective viewing. Therefore, LCD is the display technology described.

Question 274

Which mobile-device feature uses satellite signals to determine the device’s geographic location?

1. Bluetooth
2. NFC
3. GPS
4. Wi-Fi Direct

Correct Answer: 3

Explanation

GPS, or Global Positioning System, uses signals from satellites to help determine the geographic location of a compatible device. Smartphones can use GPS for navigation, mapping, location-based applications, and other services. The device may also combine GPS information with cellular or Wi-Fi data to improve location accuracy or speed up positioning. Bluetooth is used for short-range peripheral communication, NFC operates over very short distances, and Wi-Fi Direct provides direct wireless device communication. Therefore, GPS provides satellite-based positioning.

Question 275

Which storage device is generally best suited for long-term archival storage when very large amounts of data must be stored at relatively low cost?

1. Magnetic tape
2. RAM
3. CPU cache
4. Register memory

Correct Answer: 1

Explanation

Magnetic tape is commonly used for large-scale backup and archival storage because it can provide high capacity at relatively low media cost. Tape cartridges can be stored offline, which can provide an additional layer of protection against certain network-based attacks and accidental deletion. However, tape generally has slower access characteristics than SSDs and hard drives because data is accessed sequentially. RAM, CPU cache, and processor registers are volatile or temporary working-memory technologies rather than long-term archival storage. Therefore, magnetic tape is appropriate for large archival datasets.

Question 276

Which security control prevents a user from connecting an unauthorized device to a protected wired network port?

1. Port security
2. Screen timeout
3. File compression
4. Disk defragmentation

Correct Answer: 1

Explanation

Port security is a network-access control mechanism that can restrict which devices are allowed to communicate through a switch port. Depending on the implementation, a switch may associate specific MAC addresses with a port and take action when an unauthorized device attempts to connect. This helps prevent casual unauthorized network access through available Ethernet ports. Screen timeout protects an unattended device, file compression reduces storage requirements, and disk defragmentation reorganizes stored data. Therefore, port security is the control designed for the described network-access restriction.

Question 277

Which troubleshooting step should be performed after identifying a suspected cause but before implementing a permanent corrective action?

1. Replace every related component
2. Test the suspected cause to confirm it
3. Delete the user’s profile
4. Reinstall the entire operating system

Correct Answer: 2

Explanation

After identifying a likely cause, a technician should test the suspected cause before applying a permanent corrective action. Confirmation prevents unnecessary changes and helps ensure that the actual source of the problem has been identified. For example, if a faulty cable is suspected, replacing it temporarily or testing the system with a known-good cable can verify the diagnosis. Replacing unrelated components or reinstalling the operating system without justification can introduce additional problems. Therefore, confirming the suspected cause is an important troubleshooting step.

Question 278

Which type of backup contains all changes made since the most recent full backup and becomes larger with each subsequent backup until another full backup is performed?

1. Differential
2. Incremental
3. Full
4. Synthetic

Correct Answer: 1

Explanation

A differential backup includes all data changes made since the last full backup. Because every differential backup references the same full backup as its baseline, the amount of data stored generally increases as additional changes occur during the backup cycle. For restoration, the original full backup and the latest differential backup are generally required. Incremental backups contain only changes since the previous backup, which can make each individual backup smaller. Therefore, the backup type described is differential.

Question 279

Which Windows feature can automatically restore certain system settings and files to an earlier state without normally affecting personal documents?

1. Disk Cleanup
2. System Restore
3. Task Scheduler
4. Resource Monitor

Correct Answer: 2

Explanation

System Restore can return certain Windows system files, drivers, registry settings, and installed-program configurations to an earlier restore point. It is commonly used when a recent software or configuration change causes system instability. System Restore is not intended to function as a complete backup of personal documents, so users should maintain separate backup solutions for important data. Disk Cleanup removes unnecessary files, Task Scheduler manages scheduled activities, and Resource Monitor provides detailed system-resource information. Therefore, System Restore provides the described rollback capability.

Question 280

Which action is most appropriate when a technician discovers that a device requires a manufacturer-specific driver that is not currently installed?

1. Disable all security software
2. Remove the device permanently
3. Install the correct compatible driver from the manufacturer
4. Replace the motherboard immediately

Correct Answer: 3

Explanation

When hardware requires a specific driver that is missing, the technician should obtain and install the correct compatible driver from the device manufacturer or an approved organizational source. The driver should match the operating system and hardware model to avoid compatibility problems. After installation, the technician should verify that the device is recognized and functioning correctly. Disabling security software, permanently removing the device, or replacing the motherboard would not normally address a missing driver. Therefore, installing the correct manufacturer-supported driver is the appropriate action.