How does getmac find out the remote mac address of a machine?

Question

C++ / C#

So I'm wondering how she does it, if the nearest mac-address is the address of your router.

Answer 1

in the local network, machines communicate by mac addresses, of course, each knows the addressee's mac after the first access to it, at least by ping , the
mac outside the local network cannot be found out: there is no practical sense in this

Answer 2

nearest address is the address of any machine in the broadcast domain, not just the address of the router.