Explanation

• A firewall is used for security by protecting a computer or network from unauthorized access and cyber threats.
• It monitors and filters incoming and outgoing network traffic.
• Firewalls block malicious connections while allowing trusted communication.
• They help prevent hacking, malware, and unauthorized access.
• Firewalls can be hardware-based or software-based.

Last verified on 02-08-2026

Explanation

• A USB Flash Drive is the most commonly used device for copying files from one computer to another.
• It is a portable storage device that connects through a USB port.
• Users can easily copy, move, and back up files using a USB flash drive.
• It is reusable, lightweight, and compatible with most computers.
• It is also known as a USB drive, pen drive, or thumb drive.

Last verified on 02-08-2026

Explanation

Ring Topology → Token Passing

• Devices are connected in a circular structure.
• A token is passed between connected devices.
• Only the device holding the token can transmit data.

Explanation

Component Testing → Unit Testing

• Tests individual software components or modules.
• Checks whether each component works correctly.
• Helps identify errors at an early stage.

Explanation

• "An entity is anything about which we store data" is True.
• An entity is any real-world object or concept the database stores information about.
• Examples: customer, product, employee, order.