Answer :
The step that happens first after a switch receives a message that includes a MAC address is that "The switch looks up the receiving device's MAC address in a switching table." (Option C)
What is a MAC Address?
A media access control (MAC) address is a one-of-a-kind identifier assigned to a network interface controller for use as a network address in intra-network communications. This is a widespread use in most IEEE 802 networking technologies, such as Ethernet, Wi-Fi, and Bluetooth.
What is a switch?
A network switch is a piece of networking gear that links devices on a computer network by receiving and forwarding data to the target device using packet switching.
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