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1. MAC (Media Access Control) Address: • Definition: A MAC address is a unique identifier assigned to a network interface card (NIC) for communications on the physical network segment. • Structure : It consists of 48 bits, typically represented as six groups of two hexadecimal digits (e.g., 00:1A:2B:3C:4D:5E). • Usage: MAC addresses are used in the data link layer (Layer 2) of the OSI model. They facilitate communication within the same local network or LAN segment. • Example: A MAC address might look like 00:14:22:01:23:45. • Characteristics: • MAC addresses are unique to each network interface card (NIC). • They are assigned by the manufacturer and embedded in the hardware. • Used primarily in the data link layer (Layer 2) of the OSI mode -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------