How often should assessments of information systems occur according to the DoD cybersecurity framework?

The correct answer highlights the importance of periodic assessments in maintaining the security and integrity of information systems within the Department of Defense. Regular evaluations of information systems are essential for identifying vulnerabilities, ensuring compliance with security policies, and adapting to evolving threats and changes in technology.

Periodic assessments are typically defined by established schedules, which could be annually, semi-annually, or quarterly depending on the risk profile of the system and organizational requirements. This approach allows organizations to systematically review and enhance their security posture, ensure compliance with the Risk Management Framework (RMF), and effectively manage risks associated with cybersecurity threats.

Continuous monitoring, while it plays a crucial role in providing real-time insights into system performance and security, does not negate the necessity for periodic assessments. It complements them by providing ongoing visibility but does not substitute for the thorough, in-depth analysis achieved through formal assessments.

Other options imply either a lack of frequency or a more ad-hoc, less structured approach, which could potentially leave organizations vulnerable to security issues. Periodic assessments ensure a disciplined approach to managing cybersecurity risks, aligning with DoD's commitment to maintaining robust information security practices.