GETMAC /V: Mac-address is important part while tracing for layer-2 connectivity. getmac /v gives the mac-address of each adapter. Note that mac-address can also be taken from ipconfig but it sometimes becomes lengthy process. getmac /v gives crisp output with mac-addresses only.
NSLOOKUP: Remembering ip address may not be feasible all the time, so we have DNS entry. But suppose we want to check ip address associated with a url or do a reverse, i.e. check url associated with ip address, we use nslookup.