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A SonicWall firewall can be configured for optimum security by following these best practices:

1. Enable the SonicWall Security Services: Enable the SonicWall Intrusion Prevention Service (IPS), Gateway Anti-Virus (GAV), Anti-Spyware (AS), and Application Control (App Ctrl) services to provide comprehensive protection against known and unknown threats.
2. Create security policies: Create security policies that define how traffic is handled, including access control, encryption, and authentication. These policies should be based on the principle of least privilege, allowing only the necessary access.
3. Use multiple levels of security: Use multiple levels of security, including firewalls, intrusion prevention, and VPNs to provide defense in depth. This will help to protect against known and unknown threats and reduce the risk of a successful attack.
4. Keep the firmware up-to-date: Keep the firmware up-to-date to ensure that the firewall has the latest security patches and features. This will help to protect against known vulnerabilities and newly discovered threats.
5. Use strong passwords: Use strong passwords for all administrative accounts and change them frequently. Passwords should be at least eight characters long and include a mix of letters, numbers, and special characters.
6. Use two-factor authentication: Use two-factor authentication (2FA) to provide an additional layer of security for remote access. This will help to protect against unauthorized access and reduce the risk of a successful attack.
7. Monitor and log network activity: Monitor and log network activity to detect suspicious activity and to identify potential security breaches. This will help to identify potential threats and to respond quickly to any security incidents.
8. Regularly backup the configuration: Regularly backup the configuration of the firewall to ensure that it can be quickly and easily restored in the event of a failure or security incident.
9. Regularly test the security: Regularly test the security of the firewall by performing vulnerability scans and penetration tests. This will help to identify potential vulnerabilities and to ensure that the firewall is providing the level of protection required.
10. Have an incident response plan: Have a well-defined incident response plan in place to ensure that security incidents are handled quickly and effectively. This plan should include procedures for identifying, containing, and resolving security incidents.

It is important to remember that security configuration is an ongoing process and should be regularly reviewed and updated to ensure that it remains effective against new and emerging threats. Furthermore, a security audit by a professional should be performed periodically to ensure that the firewall is configured correctly and that all the best practices are followed.