A control to protect from a Denial-of-Service (DoS) attach has been determined to stop 50% of attacks, and additionally reduces the impact of an attack by 50%. What is the residual risk?
The residual risk is 25% in this scenario. Residual risk is the portion of risk that remains after security measures have been applied to mitigate the risk. Residual risk can be calculated by subtracting the risk reduction from the total risk. In this scenario, the total risk is 100%, and the risk reduction is 75%. The risk reduction is 75% because the control stops 50% of attacks, and reduces the impact of an attack by 50%. Therefore, the residual risk is 100% - 75% = 25%. Alternatively, the residual risk can be calculated by multiplying the probability and the impact of the remaining risk. In this scenario, the probability of an attack is 50%, and the impact of an attack is 50%. Therefore, the residual risk is 50% x 50% = 25%. 50%, 75%, and 100% are not the correct answers to the question, as they do not reflect the correct calculation of the residual risk.
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