What is a crucial security measure for computer networks to prevent insider threats?

A crucial security measure for computer networks to prevent insider threats is configuring firewalls and monitoring traffic. Firewalls serve as a barrier between a trusted internal network and untrusted external networks, allowing organizations to control incoming and outgoing traffic based on predetermined security rules. By configuring firewalls correctly, organizations can limit access to sensitive information and prevent unauthorized activities within the network.

Additionally, monitoring traffic is vital because it allows for the detection of unusual patterns or behaviors that may indicate insider threats. This includes tracking which employees access certain data, identifying data exfiltration attempts, or spotting any unauthorized changes. Proactive traffic monitoring also enables organizations to respond rapidly to suspicious activities, thereby mitigating the risk posed by insiders who may have malicious intent.

The other options do not adequately address the complexity of insider threats. File sharing rules, for instance, can lead to greater vulnerabilities, especially if they are not implemented with strict oversight and security controls. Monitoring only specific types of traffic, such as HTTP, would leave other vectors of attack exposed. Basic password protection is also insufficient on its own to defend against insider threats, as passwords can be shared or compromised, rendering this measure weak without additional security protocols and monitoring in place.