Question 16

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

A modem is essential for connecting a local network to the internet, allowing data to be transmitted between the user's devices and their internet service provider (ISP).

A) Manages traffic by maintaining a table of known devices

This option is incorrect as it describes the function of a router, which directs data traffic within a network and keeps track of connected devices. A modem, on the other hand, focuses on establishing and facilitating internet connectivity rather than managing device traffic.

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

This option is correct because the primary role of a modem is to connect a user's local network to the ISP, converting digital data from the customer's devices into analog signals for transmission over telephone lines or cable systems, and vice versa.

C) Provides services such as website hosting

This option is incorrect since a modem does not provide web hosting services. Web hosting is typically the function of a server that stores websites and makes them accessible over the internet, rather than the modem which merely facilitates the connection to the internet.

D) Provides a barrier between trusted and untrusted networks

This option is incorrect as it describes the function of a firewall. A modem does not inherently serve as a security barrier between different networks; its main purpose is to enable internet access rather than to filter or protect data.

Conclusion

The correct answer, B, accurately reflects the modem's fundamental role in connecting a user’s network to their ISP, making it integral for internet access. In contrast, options A, C, and D misrepresent the modem's functions by attributing responsibilities that belong to routers, web servers, and firewalls, respectively. Understanding the specific functions of these devices clarifies the distinct roles they play in networking.