Rainbow tables Brute force Shoulder surfing Dictionary attack admin See author's posts Post navigation Max saw a guy (Mario) who looked like a janitor who was holding a lot of boxes. Max held the door open for Mario. Mario was able to access the company without identification. What kind of attack is this? A large mobile telephony and data network operator has a data center that houses network elements. These are essentially large computers running on Linux. The perimeter of the data center is secured with firewalls and IPS systems. What is the best security policy concerning this setup?