What behavior is characterized by browsing internal systems outside of an employee's job responsibilities?

The behavior characterized by browsing internal systems outside of an employee's job responsibilities falls under excessive intranet browsing. This refers to instances where an individual accesses or navigates through internal company resources, databases, or intranet sites without a legitimate need related to their specific role or tasks. When employees engage in this behavior, it can raise concerns regarding data security and proper use of company resources, as it may indicate potential unauthorized access or a lack of adherence to company policies regarding information access.

The other options, while related to cybersecurity and data access issues, address different scenarios: unauthorized system access refers specifically to accessing systems without permission; data misuse typically pertains to the improper handling or sharing of sensitive information; and network exploitation involves taking advantage of vulnerabilities in a network to compromise its security. Excessive intranet browsing focuses specifically on the inappropriate exploration of internal resources that do not pertain to an employee's job functions.