What service is used for categorizing URLs for DPI scanning and web proxy?

The service employed for categorizing URLs to facilitate Deep Packet Inspection (DPI) scanning and web proxy functionality on the Sophos XG Firewall is the URLCategorizer. This service is crucial as it assigns categories to web addresses, which enables the firewall to apply appropriate policy rules based on the content type of the URLs being accessed. This categorization is essential for implementing web filtering, ensuring that organizations can block undesirable content and enforce browsing policies effectively.

While other services may play important roles within the firewall's broader functionality, they do not specifically focus on the categorization of URLs for the purpose described in the question. For instance, nSXLd, while involved in deciding traffic policies, does not handle categorization. The WebFilterService is primarily responsible for managing the overall web filtering process and policies but relies on the URL categorization performed by the URLCategorizer. The WebTrafficAnalyzer provides insights and reports on web traffic but does not categorize URLs directly. Therefore, URLCategorizer is the correct choice for the service specifically designed to categorize URLs for DPI scanning and web proxy implementation.