11. In terms of information systems security (ISS), residual risk" is:"
Answer: B
Residual risk is the remaining potential risk for each threat after all ISS countermeasures are applied.
Residual risk specifically refers to the potential risk that remains associated with each individual threat once all relevant information systems security (ISS) countermeasures have been implemented.
A) the total remaining potential risk after all ISS countermeasures are applied across all threats.
This option describes a broader concept that encompasses the overall risk across multiple threats rather than focusing on the residual risk associated with each specific threat. Therefore, it does not accurately define residual risk.
B) the remaining potential risk for each threat after all ISS countermeasures are applied.
This option correctly defines residual risk, as it highlights the concept of risk that still exists for individual threats after all applicable ISS countermeasures have been enacted. This is the essence of what residual risk represents in information systems security.
C) the product of the level of threat and the level of vulnerability.
This option mischaracterizes residual risk by equating it to a formula that measures potential risk based on threat and vulnerability levels. However, residual risk is concerned with what remains after countermeasures are taken, not the initial potential risk itself.
D) equal to threats multiplied by countermeasures and divided by vulnerabilities.
This option presents an incorrect mathematical relationship that does not accurately reflect the definition of residual risk. Residual risk is not defined in terms of a mathematical formula involving threats, countermeasures, and vulnerabilities but rather focuses on what remains after security measures are applied.
Conclusion
Option B is definitively the correct choice as it succinctly captures the concept of residual risk in the context of information systems security. Other options either misinterpret the definition or provide incorrect formulations that do not apply to residual risk. Understanding residual risk is crucial for effective risk management and ensuring comprehensive security strategies.