Using Cisco Cognitive Threat Analytics, which platform automatically blocks risky sites, and test unknown sites...

 Cisco Web Security Appliance (WSA) is the platform that automatically blocks risky sites, and tests unknown sites for hidden advanced threats before allowing users to click them, using Cisco Cognitive Threat Analytics. Cisco Cognitive Threat Analytics is a cloud-based solution that reduces the time to discovery of threats operating inside the network by analyzing web traffic and detecting anomalous behavior. Cisco WSA integrates with Cisco Cognitive Threat Analytics to provide enhanced web security and breach detection. Cisco WSA can also leverage other Cisco security solutions, such as Cisco Umbrella, Cisco Advanced Malware Protection (AMP), and Cisco Talos Intelligence Group, to provide comprehensive web security. References:

Cisco Web Security Appliance (WSA)

Cisco Cognitive Threat Analytics At-a-Glance

Introducing Cisco Cognitive Threat Analytics

Implementing and Operating Cisco Security Core Technologies (SCOR) - Module 3: Cloud and Content Security