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

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

It connects networks and forwards traffic to remote networks by using IP addressing information.
It is an all-in-one security appliance that includes IDS/IPS functionality as well as stateful firewall services.
It provides a wired or wireless connection between end devices, switches, and routers and in some cases, can regenerate weak signals.
It is placed between two or more networks and protects data and equipment from unauthorized access.