Active Information Gathering
DNS Interrogation
version number of the Berkeley Internet Name Domain (BIND)
ns1.titan.net
E-mail Accounts
Goal: create a list of users that reside on the system
helpful in any brute-force attack & login attempt
social engineering purposes
Perimeter Network Identification
Network Surveying
Goal: identify how many systems reside within the network and their associated IP address
Use Nmap
nmap -sF 192.168.1.1-255