Question 63

A modem serves as a connection between the customer network and the internet service provider.

A modem is a device that enables communication between a local network and the wider internet, effectively connecting a user's network to their internet service provider (ISP).

A) Provides services, such as website hosting and routing, for various devices

This option is incorrect as it mischaracterizes the role of a modem. While routers can facilitate connections and manage traffic, modems specifically function to connect a local network to the internet, rather than providing hosting services.

B) Provides a barrier between a trusted private network and an untrusted network

This description is more fitting for a firewall. A modem does not inherently serve as a security barrier; rather, it is designed to facilitate connectivity to the internet, making this option incorrect.

C) Manages traffic by maintaining a table of known devices on the network

This function is typically associated with a router, which keeps track of connected devices to manage data traffic. A modem does not perform this function, thus rendering this option incorrect.

D) Serves as a connection between the customer network and the internet service provider

This option accurately describes the primary function of a modem. It converts digital data from a computer into a format that can be transmitted over telephone lines, cable systems, or satellite connections, establishing the necessary link to the ISP.

Conclusion

The correct answer is definitively option D, as it directly reflects the modem's essential role in connecting a local network to an ISP. Options A, B, and C fail to accurately describe the functions of a modem, instead attributing characteristics of other networking devices such as routers and firewalls.