A RAID 1 array uses disk mirroring, meaning all data is written identically to two drives. When one drive fails, the other contains a complete, current copy of the data. CompTIA A+ emphasizes that RAID 1 is designed for fault tolerance, allowing continued operation even after a disk failure.
The correct action is to replace the defective drive and allow the RAID controller to rebuild (sync) the mirror onto the new disk. This restores redundancy and ensures ongoing data protection. The system can typically continue running during the rebuild process.
Option A is incorrect because attempting to repair a failed drive is unreliable and unnecessary-RAID 1 already provides a healthy copy. Option B ignores the importance of restoring redundancy, leaving the system vulnerable to data loss if the remaining drive fails. Option D (restore from backup) is unnecessary because RAID 1 already preserves the data.
Therefore, the best solution is to install a new drive and resynchronize the array, preserving all data with minimal disruption.

Application virtualization allows legacy software to run in a virtualized environment while the operating system remains current. It isolates the application from the OS, ensuring compatibility without downgrading the OS.
Why Not A (Shared resources): This relates to resource sharing, not application compatibility.
Why Not B (System sandbox): Sandboxes isolate applications for security testing, not compatibility.
Why Not C (Test development): Test environments are used for development, not running legacy applications.
CompTIA A+ Exam Reference: Core 1 (220-1201), Section 4.2, virtualization concepts.

A loopback plug is a diagnostic tool used to test whether a physical port such as an Ethernet NIC port or serial port is capable of sending and receiving its own signal. When inserted, it "loops" outgoing signals back into the device, confirming the port's transmit/receive functionality.
CompTIA A+ emphasizes loopback plugs as essential tools during hardware and network troubleshooting, especially when isolating physical port or NIC failures.
Network taps passively monitor traffic, crimpers attach RJ45 connectors to cables, and patch panels organize cabling none of these verify port-level functionality. Therefore, only a loopback plug can confirm that a port is working correctly by testing signal integrity and hardware responsiveness.

The appropriate network type for this scenario is a Local Area Network (LAN), which is designed for small, localized networks, such as within a single building or room. LANs are ideal for gaming because they provide high-speed, low-latency connections.
Option A (SAN): Incorrect. A Storage Area Network is used for data storage, not for gaming or general networking.
Option B (MAN): Incorrect. A Metropolitan Area Network covers a city or campus, far exceeding the scope needed for a gaming setup in a single room.
Option D (PAN): Incorrect. A Personal Area Network is designed for a single user, such as Bluetooth devices, and would not support multiple devices connecting to a game server.
References:
CompTIA A+ Core 1 Objectives: 2.7 (Compare and contrast network types and features)

The digitizer is the component responsible for detecting touch input on a screen. If touch is not registering and there's no physical damage, the digitizer may be faulty.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.1 - Mobile device hardware:
"If a touchscreen device does not respond to input and the screen is intact, the digitizer (touch sensor) may be defective." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Mobile Hardware CompTIA Exam Objectives 220-1101, Domain 3.1