Which Palo Alto Networks service provides protection against new and unknown threats?

The choice of Advanced URL Filtering is considered the best answer because this service utilizes various techniques, including dynamic analysis and machine learning, to identify and protect against new and unknown threats online. It continuously updates its database to recognize emerging threats, ensuring that users are protected in real time. By analyzing the behavior of websites instead of relying solely on existing signatures, it can effectively identify malicious content that may not have been previously classified or identified. This proactive approach is critical in today's environment where cyber threats are constantly evolving, making traditional signature-based approaches less effective against sophisticated attacks.

In contrast, while DNS Security offers protection against domain-based threats and can block access to malicious domains, it does not specifically target or analyze the content of sites as Advanced URL Filtering does. GlobalProtect is more focused on secure remote access for users and device posture, and Prisma SaaS is a cloud security solution aimed at securing SaaS applications rather than web filtering. Thus, Advanced URL Filtering stands out for its comprehensive capability to deal with new and unknown online threats effectively.