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- An Ethernet MAC address is a hardware address, therefore, it MUST uniquely identifies every Ethernet device in the world. When vendors create network devices such Ethernet NICs, wireless devices, routers, and switches, they burn-in these addresses into their devices.
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Why do NICs have MAC addresses?
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Sep 14, 2024 · When you purchase a new NIC or a device with onboard NICs, it arrives with a pre-configured MAC address or MAC addresses, respectively. Before we understand how manufacturers select MAC addresses for NICs, let’s briefly understand why a MAC should be unique in the LAN network.
May 29, 2014 · The source MAC address is the MAC address of the sender's NIC. The destination MAC address is determined based on the routing process. If the destination IP address is on a different network segment, the sender's NIC uses the MAC address of the default gateway (router) to forward the packet.
Every MAC address represent a single NIC in the world; hence, it is called Unicast (Unique) Global Address. In addition to unicast addresses, Ethernet also uses group addresses. Group addresses identify more than one LAN interface card.
Mar 19, 2018 · MAC addresses and IP addresses operate on different layers of the internet protocol suite. MAC addresses are used to identify machines within the same broadcast network on layer 2, while IP addresses are used on layer 3 to identify machines throughout different networks.
Jun 5, 2023 · MAC (Media Access Control) addresses play a crucial role in computer networking. They are unique identifiers assigned to network interfaces, such as Ethernet cards or Wi-Fi adapters. This article aims to provide a comprehensive understanding of MAC addresses and their significance in networking.
Jul 24, 2013 · The MAC-Address (Media Access Control address) in general is the identifier of devices in a network. So every NIC (network interface controller found in a router, PC, network-printer, server etc.) have MAC addresses. Some servers have more than one network card built in and therefore have multiple MAC addresses.
Mar 18, 2024 · A universally administered address is the one assigned by the NIC’s manufacturer. A locally administered address, in turn, consists of MAC addresses defined by software or operators of a system, overriding the address burnt in the physical hardware.
