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What is the purpose of the first three pairs of digits in a MAC address?
Correct Answer: D
The first three pairs of digits in a MAC address, also known as the Organizationally Unique Identifier (OUI), identify the vendor or manufacturer of the network card or adapter. This part of the MAC address is assigned by the IEEE to the manufacturers, ensuring that each MAC address is unique. Reference: Cisco DevNet Associate documentation on networking fundamentals, which explains MAC addresses and their structure.