Enumeration extracts many kind of data, such as:
– resources on the network
– username or group assigned to the network
– last time a user is logged in
– a user password

One of the tool that can be used for enumerating is nbtscan-unixwiz. If you try nbtscan-unixwiz [your ip address] you can see the network your computer is using. There is also other tool such as nbtstat, net view, and net use.
Nbtstat will show you a NetBIOS table
Net view will show you whether or not there are any shared resources on the network
And other tools as well, such as:
– NetScanTools Pro, produce a graphical view of the NetBIOS on the network
– DumpSec, tools for microsoft system
– Hyena, graphical user interface to show the shared and user logon names on window servers and domain controller
– NessusWX, enumeration of different operating system and a large network

There are also other enumeration tools for:
– service enumeration: Amap, Httprint, Httsquash, Ike-scan
– practical enumeration: theHarvester, wpscan (scan website under wordpress), jooscan, Google, Nmap