I have two Cisco WS-C3850-48P switches and both are at different locations.   Both have the same Base Ethernet MAC address and Motherboard serial number but different system serial numbers.

I have found a lot of documentation that would alow a router to be a dns server.   The command to turn on the server is "ip dns server"   This command does not exist in the IOS version I am running.  I am running the following c3640-i-mz.124-25b.bini...