Cisco 200-125 Exam

What is the first 24 bits in a MAC address called?

  • A. NIC
  • B. BIA
  • C. OUI
  • D. VAI
Answer: Option C.

An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide. They are used as the first 24 nits of the MAC address to uniquely identify a particular piece of equipment.

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