Why are MAC addresses globally unique?
The IEEE manages MAC addresses. The hardware identification addresses that the IEEE distributes are unique. That makes the probability of matching MAC addresses zero. This means that it is possible for two machines in the same network to have the same MAC address.
Are MAC addresses unique globally or locally?
The MAC address (short for media access control address) is the worldwide unique hardware address of a single network adapter. The physical address is used to identify a device in computer networks. Since MAC addresses are assigned directly by the hardware manufacturer, they are also referred to as hardware addresses.
Can you identify a device by its MAC address?
There isn’t a way to find a stolen computer from the MAC address or to find the identity behind one of these addresses. Much like IP addresses, MAC addresses are assigned to network devices and are easy to determine with tools like Command Prompt.
Why do we need MAC address when we have a MAC address?
MAC addresses can be changed temporarily most of the time but each device is supposed to have a globally unique factory assigned MAC address. Furthermore, MAC is specific to Ethernet, and while it is now the defacto Layer 2 encapsulation method, it wasn’t always the case and you never know if something better will come along in the future.
Is the MAC address required to be globally?
Since TCP/IP protocol suite uses MAC address for machine identification only within the network, in my view MAC should be unique locally and not globally. I will be grateful for explanation of requirement of MAC being unique globally. Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.
How is the uniqueness of MAC addresses enforced?
MAC Address are assigned to Vendors in various sized blocks as appropriate. The IEEE offers Registration Authority programs or registries which maintain lists of unique identifiers under standards and issue unique identifiers to those wishing to register them.
Can a network device use the same MAC address?
In order for a network device to be able to communicate, the MAC Address it is using must be unique. No other device on that local network subnet can use that MAC Address. If two devices have the same MAC Address (which occurs more often than network administrators would like), neither computer can communicate properly.