A denial-of-service (DoS) attack is a type of cyberattack that aims to disrupt or disable the normal functioning of a system or network by overwhelming it with excessive traffic or requests.

The chief technology officer (CTO) has decided to accept the risk associated with the potential loss from a DoS attack. This means that the CTO has determined that the cost or effort of implementing or maintaining controls to prevent or reduce the impact of a DoS attack is not justified by the expected benefits or savings, and that the organization is willing to bear the consequences of a DoS attack if it occurs.

The best course of action for the risk practitioner in this situation is to identify key risk indicators (KRIs) for ongoing monitoring. This means that the risk practitioner should define and measure the metrics that provide information about the level of exposure to the DoS attack risk, such as the frequency, duration, or severity of the attacks, the availability, performance, or security of the systems or networks, the customer satisfaction, reputation, or revenue of the organization, etc.

Identifying KRIs for ongoing monitoring helps to track and evaluate the actual results and outcomes of the risk acceptance decision, compare them with the risk appetite and tolerance ofthe organization, identify any deviations or breaches that may require attention or action, and report them to the appropriate parties for decision making or improvement actions.

The references for this answer are:

Risk IT Framework, page 15

Information Technology & Security, page 9

Risk Scenarios Starter Pack, page 7