Want to defend your network? Profile the person attacking it

PART 1 - Can't keep them out, so catch them while they're in

Sysadmin Blog If you want to hack someone's network then learn your target. This starts with recon. What does your target run? What information can you find out about them? Remote scanning will tell you lots about a target system ... unless their sysadmins are good and have changed all the banners to throw you off."