Easy Connect simplifies network access control and segmentation by allowing the assignment of Security Group Tags to endpoints without requiring 802.1X on those endpoints, whether using wired or wireless connectivity. Reference: https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/trustsec/trustsec-witheasy-connect-configuration-guide.pdf Group Tags to endpoints without requiring 802.1X on those endpoints, whether using wired or wireless connectivity.
Easy Connect simplifies network access control and segmentation by allowing the assignment of Security Group Tags to endpoints without requiring 802.1X on those endpoints, whether using wired or wireless connectivity. Reference: https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/trustsec/trustsec-witheasy-connect-configuration-guide.pdf

Installing the Cisco Umbrella root CA onto the user's device is the action that accomplishes the goal of inspecting traffic without alerting end-users. This is because the root CA allows the user's device to trust the certificates issued by the Cisco Umbrella intelligent proxy, which acts as a man-in-the-middle for SSL sites on Umbrella's grey list. Without the root CA, the user's browser would raise errors when accessing those sites, as it would detect an untrusted certificate. By installing the root CA, the user's browser would accept the certificate and allow the traffic to be proxied and inspected by the intelligent proxy. References:
* Enable SSL Decryption - Umbrella User Guide
* SSL Decryption in the Intelligent Proxy - Cisco Umbrella
* Cisco Umbrella Intelligent Proxy and SSL Decryption
* Intelligent Proxy and SSL Decryption with Cisco Umbrella

You can also monitor on-premises networks in your organizations using Cisco Stealthwatch Cloud. In order to do so, you need to deploy at least one Cisco Stealthwatch Cloud Sensor appliance (virtual or physical appliance).

Explanation
ETHOS is the Cisco file grouping engine. It allows us to group families of files together so if we see variants of a malware, we mark the ETHOS hash as malicious and whole families of malware are instantly detected.
Reference:
ETHOS = Fuzzy Fingerprinting using static/passive heuristics