Difficulty: Medium

Average Score: 67%

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, acting as a bridge between a local network and the internet. It enables users to access the internet by converting digital data from a computer into analog signals for transmission over telephone lines or cable systems, and vice versa.

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

While some devices, such as routers or servers, provide hosting and routing services, a modem's primary function is to connect a local network to the internet. A modem does not inherently manage or host services; it merely facilitates internet access.

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

This description pertains more closely to a firewall, which protects a network by filtering incoming and outgoing traffic. A modem does not serve as a security barrier; its role is strictly to connect networks rather than to protect them.

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

Traffic management is typically a function of a router, which keeps track of devices on a network and directs data packets accordingly. A modem does not perform this task; it simply establishes the connection to the internet without managing internal network traffic.

Conclusion

A modem's essential role is to connect a customer's local network to their internet service provider, facilitating communication between the two. It does not provide hosting services, act as a firewall, or manage network devices, which are functions typical of other networking equipment. Understanding the specific functions of a modem helps clarify its importance in establishing internet connectivity.

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