Which of the following actions is likely to jeopardize network security?

The action that is likely to jeopardize network security is sharing passwords. When individuals share their passwords, it increases the risk of unauthorized access to sensitive information and systems. It undermines one of the fundamental principles of security, which is the need for unique authentication credentials tailored to each user. Each user should maintain the confidentiality of their login information to prevent potential breaches caused by either accidental or malicious actions.

In contrast, regular software updates and restricting access to sensitive data are measures that strengthen network security. Regular updates ensure that vulnerabilities in software are patched, thereby reducing the risk of exploitation by malicious actors. Similarly, restricting access to sensitive data minimizes exposure and helps ensure that only authorized personnel can access critical information. Implementing both practices significantly enhances the overall security posture, making it difficult for unauthorized individuals to gain access to essential systems and data.