A MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communication on the physical network segment. It is used to identify a specific piece of hardware, such as a network card or a network interface within a device. MAC addresses are crucial in ensuring the proper routing of data on local networks, functioning at the data link layer (Layer 2) of the OSI model.
A. A user is identified through user accounts, not hardware-level MAC addresses.
C. An IP address identifies devices on a network but operates at Layer 3 (Network Layer), while MAC addresses work at the hardware level.
D. A network is identified by an IP address or a subnet, not by a MAC address.
References:
CompTIA Network+ Certification Objectives
Official CompTIA A+ Study Guide
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