Question 30

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

A modem is essential for establishing a communication link between a user's local network and their internet service provider (ISP). It modulates and demodulates signals for data transmission over various mediums, enabling internet access.

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

This option is correct as it accurately describes the primary function of a modem. By connecting the local network to the ISP, the modem facilitates the transmission of data to and from the internet, allowing users to access online services.

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

This option is incorrect because a modem does not provide website hosting or routing services. These functions are typically performed by a router or a web hosting server, whereas a modem's role is specifically to connect the local network to the ISP.

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

This option is also incorrect. Managing network traffic and maintaining a table of devices is a function of a router, not a modem. A modem's function is focused on signal conversion and connectivity rather than traffic management.

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

This option is incorrect as well. While security features may be present in some modems, the primary purpose of a modem is not to act as a barrier between networks. Firewalls and routers are specifically designed for that purpose.

Conclusion

The correct answer, A, clearly defines the modem's role in connecting a customer's network to the ISP, which is its fundamental purpose. All other options misinterpret the functions of networking devices, either attributing capabilities to the modem that belong to routers or servers, or misrepresenting its primary function. Understanding the specific roles of each device is crucial in networking.