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What does a modem do?

Rationale

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 over telephone lines, cable systems, or satellite links. It acts as a bridge that connects the local network of a customer to the broader internet provided by an Internet Service Provider (ISP).

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

This function is typically associated with a router rather than a modem. While routers do manage network traffic and keep track of devices, modems focus primarily on connecting to the internet without handling internal network organization.

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

This description fits a firewall, which protects a private network from unauthorized access. A modem does not inherently provide security features or barriers; its main role is to facilitate internet connectivity.

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

Website hosting and routing are generally performed by servers and routers, not modems. A modem's primary role is to connect to the ISP and enable internet access, rather than managing or providing web services directly.

Conclusion

In summary, a modem's essential function is to serve as a connection between a customer's local network and their ISP, enabling internet access. While other devices perform critical network management and security tasks, the modem's role is specifically focused on facilitating data transmission to and from the internet. Understanding the distinct functions of network devices helps clarify their specific purposes within a network architecture.

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