When you ping a link-local address with the Ping.exe tool, you can include a zone ID to specify the interface over which the ICMPv6 Echo Request messages are sent. For link-local addresses, the zone ID is typically equal to the interface index, as displayed in the output of the netsh interface ipv6 show interface or command.
For site-local addresses, the zone ID is equal to the site number, as displayed in the output of the netsh interface ipv6 show interface level=verbose command.
However, the zone ID is not required when the destination is a global address.
For site-local addresses, the zone ID is equal to the site number, as displayed in the output of the netsh interface ipv6 show interface level=verbose command.
However, the zone ID is not required when the destination is a global address.