A datacenter recently experienced a breach. When access was gained, an RF device was used to access an air-gapped and locked server rack. Which of the following would BEST prevent this type of attack?

A. Faraday cage

B. Smart cards

C. Infrared detection

D. Alarms

Answer:A. Faraday cage.

Explanation: Faraday cage is a kind of shield made up of conducting wires, Faraday's cage or shield is named after Michael Faraday who invented it in the year 1836.

Faraday cage is used to protect sensitive electronic equipment such as RF receivers) from external electromagnetic rays such as radio frequency interference (RFI) usually during testing or alignment of the device.

Faraday cage has also been used to protect equipment and people from Electric current and Damage.

The correct answer is A. Faraday cage.

Explanation:

A Faraday cage is a metal box that protects against static electric fields. It owes its name to the physicist Michael Faraday, who built one in 1836. They are used to protect against electric shock, since inside the electric field is null.

The operation of the Farday cage is based on the properties of a conductor in electrostatic equilibrium. When the metal box is placed in the presence of an external electric field, the positive charges remain in the network positions; electrons, however, which in a metal are free, begin to move.