Are you asking hypothetically?
In real world examples… Mac addresses are Layer 2, unlike IP addresses which are Layer3. Basically Mac is a hardware address hardcoded to the device and no two devices will have duplicate addresses. that’s how the system is designed.
Officially, no two network devices will ever have the same Mac address.
I am ignoring the fact that Mac spoofing is a possibility (software duping network Mac addresses, in which case duplicate Macs possible… but that’s not your situation here).
If two devices had the same MAC on the same network , it could lead to L2 loops and possible network congestion. Some devices may not like the duplication at all and freeze services all together. Behaviour is unpredictable as dependent on device firmware.
Are you asking hypothetically? In real world examples… Mac addresses are Layer 2, unlike IP addresses which are Layer3. Basically Mac is a hardware address hardcoded to the device and no two devices will have duplicate addresses. that’s how the system is designed. Officially, no two network devices will ever have the same Mac address. I am ignoring the fact that Mac spoofing is a possibility (software duping network Mac addresses, in which case duplicate Macs possible… but that’s not your situation here).
If two devices had the same MAC on the same network , it could lead to L2 loops and possible network congestion. Some devices may not like the duplication at all and freeze services all together. Behaviour is unpredictable as dependent on device firmware.