Physical Addressing and Logical Addressing

The MAC address is considered the physical address because it is the only truly permanent identifier of a device. the IPs can be dynamically changed, but the MAC of one device will also belong solely to that device.

VM's: 16:98:77:e7:98:64

Physical: 04:92:25:51:BD:4C

On the physical NIC, the MAC address was assigned by the manufactorer as it was created. In contrast, the VM's was created by the press of a button. The only similarities between the two MAC's is that the OUI that use could not be Identified, which indicates that either the website is bad, or the NICs are too old/new/rare to be recorded. In differences though, the website indicated that the MAC of the real device was at the very least assigned from some manufacturer, while it had no information on the VM's MAC. a VM still needs a MAC address as it's goal is to recreate a real machine as realisitic to it as possible. Also, many network functions require the senders mac address to be a part of the packet, which  would be an issue if it did not generate its own MAC to fake it.

Most of the vendors here were major companies. Additionally, most were making real NICs, with only the VMware being made up and maybe the last one too. Virtualization Vendors also need OUIs as without them a protection service like cloudflare would find any traffic really suspicious. They also would add credibility to a virtual machine, allowing it to be more like the real ones. This has helped to understand how every MAC address, although it is unique, still identifies manufactorer and gives flexibility for them to include more data.

16:98:77 e7:98:64

The OUI (first 3 pairs) shows the manufacturer of the NIC. As this was a randomized MAC on a VM, this actually had no manufacturer when checked. manufacturers must use unique OUIs to prevent any accidental ovelap, which can cause great issues with systems. by each manufacturer having different starts, and trusting them to check that none of the devices they make overlap.

for the device identifier (last 3 pairs) this is the part that makes it truely unique. Every one of these, while they might overlap with another device, they won't overlap another device + manufactorer combo. This is what ensures every device is truely its own. This is important for frame delivery, because this is the only true unique and constant address for a device on a network

In short, every device needs a globally unique mac address to have a reliable identifier that only will ever apply to one device