Few secrets which can be revealed by Sniffing:
1. Mac & IP's --> Helpful for Spoofing (Hide identity / Intend as authorised user)
2. Exposing Services --> Revealing running services & versions
3. Passwords --> Plain text protocols
4. Security Feature Detection --> Running security (FW/AV/IPS/VPN/WAF) functionality
5. Debugging --> Confirmance, IOT, etc..
6. Investigations --> POST analysis
