Following my post from two weeks ago about Scanning, enumeration is a Network Hackers next step. Enumeration is when you probe services (that was identified from scanning) for vulnerabilities. Now, up to this point we were able to keep a anonymous veil around us. However, enumeration requires active connections or direct queries to your target, which could be logged or capture and then used against you. Typically you are looking for usernames (that you can use for brute force guessing), email addresses (used for phishing attempts), or misconfigured/outdated systems with known vulnerabilities.