Comprehensive and Detailed Explanation From Exact Extract:
To ensure the authenticity of a downloaded application, the most reliable method is to verify the file's hash (e.
g., SHA256, MD5) against the value provided by the legitimate vendor. If the hash values match, the file has not been altered or tampered with. This verification confirms the integrity and authenticity of the executable.
B: Process IDs are dynamic and not unique to specific software.
C: Running in safe mode doesn't validate legitimacy-it only runs the app in a minimal environment.
D: File names can be spoofed; matching the name does not prove authenticity.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast authentication and software integrity verification methods.
Study Guide Section: Hash verification for software authenticity and digital integrity

Comprehensive and Detailed Explanation From Exact Extract:
To prevent external access, the technician should avoid exposing the surveillance system's port to the public internet. Port mapping (also known as port forwarding) is the method used to control which internal devices and ports are accessible from the outside. By not configuring port forwarding for the device, external login attempts are effectively blocked.
B: Subnetting organizes IP addresses but doesn't directly restrict access.
C: A static IP ensures consistent addressing but does not secure access.
D: Content filtering is used to restrict web content, not to block access to a web interface.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast security measures and tools.
Study Guide Section: SOHO router security - port forwarding and blocking external access

Comprehensive and Detailed Explanation From Exact Extract:
An MSDS (Material Safety Data Sheet), now commonly referred to as SDS (Safety Data Sheet), is a document that provides detailed information on the properties of a particular substance. It includes safety guidelines and emergency procedures related to handling, exposure, fire hazards, and first aid-not installation or configuration instructions.
For a battery backup (UPS device), the MSDS would include emergency procedures such as what to do in case of a chemical spill, exposure to battery acid, or fire hazard due to overheating or chemical leakage. This ensures the safety of personnel and complies with hazardous materials handling regulations.
Reference:
CompTIA A+ 220-1102 Objective 4.1: Given a scenario, implement best practices associated with documentation and support systems information management.
Study Guide Section: MSDS/SDS usage and safety documentation

Comprehensive and Detailed Explanation From Exact Extract:
Multi-Factor Authentication (MFA) requires at least two different types of authentication factors:
* Something you know (e.g., password or PIN)
* Something you have (e.g., smartphone or hardware token)
* Something you are (e.g., fingerprint or facial recognition)
Option A, sending a code to the user's phone, is an example of "something you have" - a physical device that receives a one-time passcode. Combined with a password, this forms a proper MFA implementation.
B: Date of birth is another knowledge-based factor (like a password), not a second factor type.
C: Solving a math problem is not a recognized authentication factor.
D: A PIN is also "something you know" and does not count as a distinct MFA factor when paired with a password.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast common security measures and authentication technologies.
Study Guide Section: Authentication factors - password, biometrics, tokens, MFA

Comprehensive and Detailed Explanation From Exact Extract:
Facial recognition is a biometric authentication method that ties access to a unique physical feature of the user. Unlike passcodes or pattern locks-which can be easily shared-facial recognition provides a more secure and non-transferable form of access. It also enhances user convenience and is widely supported by modern smartphones.
A: Pattern locks can still be shared and are less secure.
C: Device encryption protects data but does not prevent screen access if a passcode is shared.
D: Multifactor authentication typically applies to app or account access, not basic phone unlocking.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast common security measures and authentication technologies.
Study Guide Section: Biometric screen lock technologies (e.g., facial recognition, fingerprint)