Question 37

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

A modem is a device that modulates and demodulates signals for data transmission, effectively linking a user's home or business network to the wider internet provided by an internet service provider (ISP).

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

This option describes a function more suited to a router, which is responsible for directing traffic within a network by maintaining information about connected devices. A modem does not perform this function; rather, it focuses on connecting to the ISP.

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

This option refers to the function of a firewall, which protects a private network from external threats. A modem does not serve as a security barrier; its primary role is to facilitate internet connectivity.

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

While some devices like servers provide hosting services, a modem does not host websites or route data within a local network. Its function is limited to connecting the local network to the internet, not providing additional services.

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 connects the user's internal network to the ISP, enabling access to the internet by converting digital data from the customer’s devices into a format suitable for transmission over various types of networks.

Conclusion

The correct answer is D, as it succinctly captures the essential role of a modem in linking customer networks to internet service providers. Options A, B, and C misrepresent the modem's functions, as they discuss tasks associated with routers, firewalls, and servers, which are distinct from the modem's role. Thus, D is the only option that correctly identifies the modem's primary purpose.