What is the main purpose of using a modem in a network?

The primary function of a modem in a network is to convert digital signals into analog signals and vice versa. This conversion is essential for transmitting data over traditional telephone lines or other communication mediums that are inherently analog. When data is sent from a computer in digital form, the modem transforms these signals into analog signals for transmission over networks that cannot handle digital signals directly, such as standard phone lines or cable systems. On the receiving end, the modem then converts the analog signals back into digital format for the computer to process.

While network devices like routers and switches facilitate data traffic by directing packets across the network, and other functions like assigning IP addresses relate to specific networking tasks, these do not capture the fundamental role of a modem. Additionally, improving network security is typically handled by firewalls and security protocols, rather than modems, which focus on signal conversion.