Difficulty: Easy

Average Score: 100%

What does a modem do?

Rationale

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

A modem converts digital signals from a customer's network into analog signals for transmission over telephone lines or cable, and vice versa. This essential function allows users to access the internet by linking their home or business networks to their internet service provider (ISP).

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

This choice accurately describes the primary function of a modem. It facilitates communication by converting and transmitting data between the user's local network and the ISP, enabling internet access. Without this connection, users would not be able to reach the internet.

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

While routers can provide services like routing and sometimes hosting, a modem's main role is not to host websites or manage routing within a local network. Instead, it focuses on connecting the user’s network to the internet, making this choice incorrect.

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

This description aligns more closely with the function of a router rather than a modem. A router manages data traffic within a network by keeping track of connected devices, while a modem’s role is to facilitate the connection to the ISP. Thus, this choice is incorrect.

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

This function is characteristic of a firewall, not a modem. While some modems may have built-in firewall features for security, the primary purpose of a modem is to connect to the ISP, not to act as a barrier between networks. Therefore, this choice is also incorrect.

Conclusion

A modem's key function is to establish a link between a customer's network and the internet service provider, allowing users to access the internet. While other devices like routers and firewalls perform distinct roles in network management and security, the modem remains essential for connectivity. Understanding this function clarifies the modem's indispensable role in home and business networking.

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