A technician is searching through a storage locker and finds a repeater. What is the purpose of this device?

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Question:
A technician is searching through a storage locker and finds a repeater. What is the purpose of this device?

It is used to regenerate weak signals to extend the distance a signal can travel.
It is a legacy device that connects end devices and where traffic from one connected device floods out to every other connected device.
It connects multiple end devices and can be configured for VLANs and port security.
It is a legacy device used to divide LANs into network segments, filtering traffic between those LAN segments.