Comprehensive and Detailed Explanation From Exact Extract:
A Zero-day vulnerability refers to a security flaw in software or hardware that is unknown to the vendor or has not yet been patched. If this vulnerability is exploited before the vendor has issued a fix or patch, it becomes a Zero-day exploit. These attacks are highly dangerous because they take advantage of the absence of defenses due to the lack of awareness or mitigation options.
A: Spoofing is a form of impersonation, not necessarily tied to unpatched vulnerabilities.
B: Brute-force attacks rely on repeatedly guessing credentials and are not related to software flaws.
C: DoS (Denial of Service) attacks are meant to overwhelm systems and don't necessarily exploit unknown vulnerabilities.
Reference:
CompTIA A+ 220-1102 Objective 2.3: Compare and contrast common social engineering, threats, and vulnerabilities.
Study Guide Section: Threat types - Zero-day attacks, definitions, and implications

Comprehensive and Detailed Explanation From Exact Extract:
If a system becomes unresponsive while opening a specific spreadsheet, the issue is likely tied to the file's size or the complexity of its content (e.g., embedded formulas, macros, or graphics). High memory utilization caused by the file can lead to temporary freezing or application "Not Responding" messages. Checking the spreadsheet's file size and monitoring system memory in Task Manager will help isolate performance bottlenecks.
A: Anti-malware logs are important for security troubleshooting but less likely relevant to spreadsheet-related performance issues.
B: Workstation repair is for system-wide problems and not necessary for a single-file issue.
C: Bandwidth relates to network usage and wouldn't impact opening a local file.
Reference:
CompTIA A+ 220-1102 Objective 3.3: Troubleshoot common application issues.
Study Guide Section: Troubleshooting application slowness and performance using Task Manager and resource monitoring tools

Comprehensive and Detailed Explanation From Exact Extract:
Device encryptionensures that even if someone bypasses biometrics or has physical access to the phone, they cannot read the stored data without the encryption key.
FromQuentin Docter - CompTIA A+ Complete Study Guide:
"Encryption is the most effective way to protect data at rest. Even if the device is lost or stolen, encryption ensures the data remains inaccessible without the correct key or passcode."

Comprehensive and Detailed Explanation From Exact Extract:
To work remotely without physically transporting a workstation, the user needs:
* C. RDP (Remote Desktop Protocol): Allows graphical remote access to a Windows PC at the office.
* D. VPN (Virtual Private Network): Establishes a secure tunnel to access the corporate network remotely, making the internal PC reachable.
A: SPICE is used in virtual machine environments and is not typically used for end-user remote desktop access.
B: SSH is a text-based remote access tool used mostly for Linux systems.
E: RMM (Remote Monitoring and Management) is used by IT administrators for support - not end-user remote access.
F: WinRM is used for Windows remote management via PowerShell, not for full desktop access.
Reference:
CompTIA A+ 220-1102 Objectives 2.2 & 4.4: Compare and contrast security tools and remote access methods.
Study Guide Section: Remote access tools - RDP and VPN for secure remote work

Comprehensive and Detailed Explanation From Exact Extract:
Group Policyis the standard administrative tool for enforcing security and configuration settings across domain-joined systems, including disabling guest accounts.
FromQuentin Docter - CompTIA A+ Study Guide:
"Disabling guest accounts and applying consistent security policies across multiple machines is best achieved through Group Policy on a Windows domain."