Which component is responsible for connecting a computer to the internet?

• A. Router
• B. Switch
• C. Modem
• D. Firewall

Answer: (C)

The modem is a crucial component that connects a computer to the internet. It serves as a bridge between the local network within a home or office and the wider internet. The modem modulates and demodulates signals, allowing digital data from the computer to be transmitted over various types of connections, such as cable, DSL, or fiber.

When a computer needs to send data to the internet, the modem converts the digital signal from the computer into an analog signal suitable for the transmission medium used by the internet service provider (ISP). Conversely, it also converts incoming analog signals back into digital signals that the computer can understand.

Other components mentioned, such as the router, switch, and firewall, have distinct roles in a network. The router directs data between different networks and can connect multiple devices within a home network. The switch connects multiple devices within a local area network, allowing them to communicate with each other. A firewall, on the other hand, provides security by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. While these components are important in a network setup, the primary function of accessing the internet is primarily handled by the modem.