What is an alternative to Zscaler's default certificate authority for SSL inspection?

The correct answer is the option that involves using a dedicated root certificate authority created offline specifically for SSL inspection. This method serves as a secure alternative to Zscaler's default certificate authority. By having a dedicated root CA that is managed and controlled by the organization, you can effectively perform SSL inspection while maintaining the trust and security of the traffic that your organization handles.

Creating a root CA offline ensures that it remains secure from external threats during its generation and storage. In addition, by utilizing this dedicated root CA for SSL inspection, organizations can maintain an added layer of compliance and oversight over their own certificates, which can be essential in environments with strict regulatory requirements.

The other options do not provide viable or effective alternatives for SSL inspection. An enterprise-grade firewall may offer some security features, but it lacks the specific capabilities dedicated to managing the SSL inspection process. Not using any certificate for inspection would compromise the ability to inspect encrypted traffic, which defeats the purpose of SSL inspection altogether. Lastly, using SSL certificates from multiple providers without a centralized certificate authority could lead to management complexity and inconsistent security policies, making it less effective in maintaining oversight on traffic inspection.