A Virtual Private Network (VPN) creates an encrypted, secure tunnel across a public or untrusted network. It uses authentication credentials to ensure that only authorized users can connect, keeping data safe from interception.
Reference: CompTIA A+ Certification Exam Core 1 Objectives - Domain 2.0 Networking - Objective 2.3:
Compare and contrast various types of networks.

Amaintenance kitfor a laser printer often includesrollers, fuser, and other partsthat wear out over time. If the printer issmudging and misfeeding, it's a sign thatmultiple components are failing, which a maintenance kit is designed to resolve.
Option A (Fuser):May cause smudging if it's not heating correctly, but it won't resolve paper misfeeds alone.
Option C (Corona wire):Can cause poor image quality if dirty but doesn't affect paper feeding.
Option D (Toner cartridge):Can cause streaks if defective, but not paper feed issues.
CompTIA A+ Core 1 Exam Objective Reference:
Objective 3.4: Given a scenario, install and configure printers.

When a laptop screen is replaced, the technician typically removes the display assembly components and works near the hinge area where the Wi-Fi antenna leads are routed. In most laptops, the Wi-Fi antennas are built into the display bezel and connect to the wireless adapter using thin coax cables labeled MAIN/AUX. If one or both antenna leads are left disconnected, pinched, or not fully seated during reassembly, the Wi-Fi adapter may still appear in the OS, but the radio signal strength becomes extremely weak. A common symptom is no SSIDs found or only very close/strong networks intermittently.
Bluetooth working does not rule this out because Bluetooth can have separate antennas or may still function at short range even when Wi-Fi reception is poor. Ethernet working confirms general network access and suggests the issue is isolated to the Wi-Fi radio path rather than the router, ISP, or OS networking stack. The wireless access point is unlikely to be the cause if the issue started immediately after hardware service and other devices can see SSIDs. Therefore, the first hardware check should be the wireless antenna connections and routing.

If a laptop shuts down when undocked and remains powered off even with a new charging cable, the internal battery is likely faulty and cannot hold a charge. Replacing the battery is the next troubleshooting step.
From the CompTIA A+ 220-1101 Official Study Guide, Objective 4.1 - Troubleshoot common hardware problems:
"If a laptop only works when docked or connected to AC power, and a replacement cable does not resolve the issue, the internal battery may need to be replaced." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 4: Troubleshooting Mobile Devices CompTIA Exam Objectives 220-1101, Domain 4.1

PCIe (Peripheral Component Interconnect Express) is required for high-end video cards.
NVMe (Non-Volatile Memory Express) utilizes the M.2 or PCIe interface for the fastest SSD performance.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.2 - Motherboard expansion slots and storage interfaces:
"High-end video cards require a PCIe slot, while NVMe drives use M.2 (PCIe) slots for the highest data transfer rates." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Motherboard and Storage CompTIA Exam Objectives 220-1101, Domain 3.2