Which measure can protect against unauthorized changes to a computer network?

All of the measures listed play a significant role in enhancing network security and protecting against unauthorized changes to a computer network.

A strong password policy is essential as it sets the foundation for access control. Ensuring that users create complex and unique passwords reduces the risk of unauthorized access that could lead to changes in network settings or data. It helps in safeguarding accounts against brute force attacks or easy guessing.

Implementing a network access control list (ACL) is a critical measure that specifies which users or systems have permission to access certain resources. An ACL helps prevent unauthorized users from making changes to the network by defining explicit rules on what is allowed or denied within the network. This control mechanism is vital for maintaining the integrity and security of the network infrastructure.

Regularly auditing security events serves as a proactive approach to identify any attempts of unauthorized changes. By analyzing logs and monitoring activities, administrators can quickly detect anomalies or suspicious behavior, allowing for prompt responses to mitigate risks. This practice not only helps in tracking possible intrusions but also aids in compliance with security policies and regulatory requirements.

Each of these measures contributes uniquely to the overall security posture of a network, making the combined implementation the most effective way to protect against unauthorized changes.