for windows "ipconfig"
"ipconfig/all" means it will show the mac address and also
show the dns value of the particular machine, if not means
their is a problem in your dns.
in linux or unix u can use to know the ip address of the
system ifconfig -a
in windows you can use to know the ip address of the system
ipconfig or if you want to get more details type ipconfig/all.
which IP address will probably be used for an organization
having a network of between 1000 and 1500 computers?
explain your reason for arriving at the solution