Switch (A): A network switch is a fundamental device used to connect devices in a local area network (LAN) and forward packets based on MAC addresses.
Firewall (B): A firewall is used to filter and protect the network from unauthorized access and threats.
Router (D): A router is essential for forwarding packets between different networks and managing routing.
Agile Controller (C): This is a network automation and management tool rather than a fundamental networking device. Since it is not typically deployed as a core network device, option C is the correct answer.
[Reference: HCIA-Datacom Study Guide, Network Basics Section., , ]
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