Which two approaches should an Integration Architect recommend to allow access to on-premise systems by Salesforce?

The recommended approach of whitelisting Salesforce IPs on the firewall is crucial for facilitating a secure connection between Salesforce and on-premise systems. This method allows for the identification and control of which users and applications can interact with your internal systems, thus maintaining security while still enabling necessary access. By allowing only connections coming from Salesforce's specific IP addresses, the risk of unauthorized access from unknown sources is significantly reduced.

Additionally, whitelisting IPs ensures that communication between Salesforce and the on-premise systems adheres to the organization's security protocols. It provides a manageable way to restrict access while ensuring that legitimate requests from Salesforce can proceed unobstructed.

The other approaches mentioned, while they may contribute to security and connectivity, do not address the need for allowing Salesforce access as directly. For instance, simply placing systems in a DMZ may improve their accessibility but doesn’t assure that Salesforce can connect directly, nor does it control access effectively. Similarly, utilizing two-way SSL is a good security practice, but it alone does not establish a pathway for Salesforce’s connection unless the IPs are properly managed. Whitelisting corporate IPs in Salesforce could restrict the connection only to specific internal users, which may not be a scalable or effective solution for integrating all necessary data interactions