Using Cisco Cognitive Threat Analytics, which platform automatically blocks risky sites, and test unknown sites for hidden advanced threats before allowing users to click them?

Cisco Identity Services Engine (ISE) is for access control and policy management, not primarily for web content filtering and threat analysis of URLs.

Cisco Enterprise Security Appliance is a broad term and not a specific product primarily responsible for web content analysis and blocking like the WSA.

The Cisco Web Security Appliance (WSA) is designed for comprehensive web security, including URL filtering and advanced threat protection, and when integrated with Cisco Cognitive Threat Analytics, it proactively identifies and blocks access to malicious or risky websites and inspects unknown URLs for hidden threats before users click them, safeguarding against web-based attacks.

Cisco Stealthwatch (now Cisco Secure Network Analytics) focuses on network visibility and anomaly detection using flow data, not specifically on proactive web URL analysis and blocking.