Question 1

What is a MAC address?

Accepted Answer

A MAC (Media Access Control) address is a unique identifier assigned to network interfaces. It consists of 6 pairs of hexadecimal digits (48 bits), typically shown as 00:1A:2B:3C:4D:5E.

Question 2

What is an OUI?

Accepted Answer

OUI (Organizationally Unique Identifier) is the first 3 bytes of a MAC address assigned by IEEE to hardware manufacturers. For example, 00:1A:2B belongs to a specific vendor.

Question 3

What is the LAA (Locally Administered) bit?

Accepted Answer

The second least significant bit of the first octet. When set to 1, the MAC is locally administered (not assigned by IEEE). Useful for virtual machines and testing.

Question 4

Can MAC addresses be traced?

Accepted Answer

Yes, the OUI portion identifies the manufacturer. However, locally administered addresses (LAA bit set) cannot be traced to a specific vendor.

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