Discovering the Functions of Media Access Control (MAC) Address over the Wired Public IP Network

Does the MAC address have any functions in the Public network? A Media Access Control Address (MAC Address) is a unique number assigned to a Network interface controller (NIC) card of a Personal Computer (PC) or Server or Router or Firewall or any other devices attached to Private or Public wired Network segments. MAC address indicates only the device's LAN or NIC card and the NIC card primarily holds the Internet Protocol (IP) address [1]. This paper differentiates each function of MAC address (not MAC card or LAN card, LAN card is essential for Networking) and IP address and describes their scopes of work and limitations.