Isaca Updated CISM Exam Questions and Answers by amari

= According to the CISM Manual1, risk is defined as the combination of the probability of an event and its consequence. Therefore, determining the risk for a particular threat/vulnerability pair before controls are applied can be expressed as a function of the likelihood and impact, should a threat exploit a vulnerability. Likelihood is the probability or frequency of a threat occurring, while impact is the magnitude or severity of the harm or loss that would result from a threat exploiting a vulnerability. The higher the likelihood and impact, the higher the risk. The lower the likelihood and impact, the lower the risk.

The other options are not correct because they do not capture the full expression of risk. Option B only considers the impact, but not the likelihood, of a threat exploiting a vulnerability. Option C confuses the risk with the risk response, which is the action taken to reduce or mitigate the risk. Option D only considers the likelihood, but not the impact, of a threat attempting to exploit a vulnerability.

References = CISM Manual1, Chapter 2: Information Risk Management (IRM), Section 2.1: Risk Concepts2

1: https://store.isaca.org/s/store#/store/browse/cat/a2D4w00000Ac6NNEAZ/tiles 2: 2

Network segmentation is the most effective control to prevent lateral movement. In ransomware attacks, attackers often breach one endpoint and move laterally across the network to reach critical assets.

Segmentation limits this movement by isolating systems into different zones or subnets, thereby reducing the attack surface and preventing unauthorized internal traversal.

DLP and encryption are primarily focused on data protection, not internal network movement.

IDS can detect intrusions but does not prevent movement like segmentation does.

“Network segmentation limits the scope of access for compromised systems and is a key strategy in preventing lateral movement in an attack.”

— CISM Review Manual 15th Edition, Chapter 3: Information Security Architecture, Section: Network Security*

Real-world example: “In the NotPetya and WannaCry incidents, poor internal segmentation allowed malware to propagate rapidly.”