Which best practice involves ensuring security when Salesforce communicates with other systems?

The best practice that involves ensuring security when Salesforce communicates with other systems focuses on enforcing strict firewall rules to limit access. By implementing strict firewall rules, organizations can control the inbound and outbound traffic to and from Salesforce, preventing unauthorized access and mitigating potential security threats. Firewalls can be configured to allow only specific IP addresses, protocols, and ports, which greatly reduces the attack surface for external systems trying to interact with Salesforce.

This approach not only helps in safeguarding sensitive data but also ensures that only trusted systems have the ability to communicate with Salesforce, thereby maintaining a secure environment for data exchange. Integrating such security measures is crucial, especially when dealing with multiple systems that may have varying levels of security itself.