Explanation

Other features are dependent on SSL Decryption functionality, which requires the Cisco Umbrella root certificate. Having the SSL Decryption feature improves: Custom URL Blocking-Required to block the HTTPS version of a URL. ... Umbrella's Block Page and Block Page Bypass features present an SSL certificate to browsers that make connections to HTTPS sites. This SSL certificate matches the requested site but will be signed by the Cisco Umbrella certificate authority (CA). If the CA is not trusted by your browser, an error page may be displayed. Typical errors include "The security certificate presented by this website was not issued by a trusted certificate authority" (Internet Explorer), "The site's security certificate is not trusted!" (Google Chrome) or "This Connection is Untrusted" (Mozilla Firefox). Although the error page is expected, the message displayed can be confusing and you may wish to prevent it from appearing. To avoid these error pages, install the Cisco Umbrella root certificate into your browser or the browsers of your users-if you're a network admin. Reference: https://docs.umbrella.com/deployment-umbrella/docs/rebrand-cisco-certificate-import-information certificate. Having the SSL Decryption feature improves:
Custom URL Blocking-Required to block the HTTPS version of a URL.
...
Umbrella's Block Page and Block Page Bypass features present an SSL certificate to browsers that make connections to HTTPS sites. This SSL certificate matches the requested site but will be signed by the Cisco Umbrella certificate authority (CA). If the CA is not trusted by your browser, an error page may be displayed.
Typical errors include "The security certificate presented by this website was not issued by a trusted certificate authority" (Internet Explorer), "The site's security certificate is not trusted!" (Google Chrome) or "This Connection is Untrusted" (Mozilla Firefox). Although the error page is expected, the message displayed can be confusing and you may wish to prevent it from appearing.
To avoid these error pages, install the Cisco Umbrella root certificate into your browser or the browsers of your users-if you're a network admin.
Other features are dependent on SSL Decryption functionality, which requires the Cisco Umbrella root certificate. Having the SSL Decryption feature improves: Custom URL Blocking-Required to block the HTTPS version of a URL. ... Umbrella's Block Page and Block Page Bypass features present an SSL certificate to browsers that make connections to HTTPS sites. This SSL certificate matches the requested site but will be signed by the Cisco Umbrella certificate authority (CA). If the CA is not trusted by your browser, an error page may be displayed. Typical errors include "The security certificate presented by this website was not issued by a trusted certificate authority" (Internet Explorer), "The site's security certificate is not trusted!" (Google Chrome) or "This Connection is Untrusted" (Mozilla Firefox). Although the error page is expected, the message displayed can be confusing and you may wish to prevent it from appearing. To avoid these error pages, install the Cisco Umbrella root certificate into your browser or the browsers of your users-if you're a network admin. Reference: https://docs.umbrella.com/deployment-umbrella/docs/rebrand-cisco-certificate-import-information

Cisco Umbrella and Cisco Duo Security are two solutions that help combat social engineering and phishing at the endpoint level. Cisco Umbrella is a cloud-based security platform that provides DNS-layer security, web filtering, and threat intelligence to protect users from malicious websites and domains. Cisco Duo Security is a multi-factor authentication (MFA) solution that verifies the identity of users and the health of their devices before granting access to applications. Both solutions help prevent attackers from compromising endpoints and stealing credentials or data through phishing or other social engineering techniques. References:
* Cisco Umbrella
* Cisco Duo Security
* Implementing and Operating Cisco Security Core Technologies (SCOR) - Module 3: Cloud and Content Security

This is a type of Outbreak Control list that allows the administrator to create a list of files based on their SHA-
256 hash values that will be detected, blocked, and quarantined by the AMP for Endpoints connectors. The Simple Custom Detection list can be applied to a policy and synchronized with the devices that have the AMP connectors installed. This way, the administrator can prevent the execution of specific files without having to quarantine them on the devices.
The other options are incorrect because:
* Advanced Custom Detection is a type of Outbreak Control list that allows the administrator to create custom rules based on file attributes, such as file name, size, path, or parent process. These rules can be used to detect and block files that match certain criteria, but they cannot be used to quarantine them.
* Blocked Application is a type of Outbreak Control list that allows the administrator to create a list of applications based on their SHA-256 hash values that will be blocked from running on the devices that have the AMP connectors installed. However, this list does not detect or quarantine the applications, only prevents them from executing.
* Isolation is a feature of AMP for Endpoints that allows the administrator to isolate a device from the network if it is compromised by malware. This prevents the device from communicating with other devices or the internet, but does not affect the files on the device.
References:
https://www.cisco.com/c/en/us/support/docs/security/amp-endpoints/215176-configure-a-simple-custom- detection-list.html
https://community.cisco.com/t5/endpoint-security/block-list-data-source-in-cisco-amp/td-p/4077205
https://community.cisco.com/t5/security-videos/amp4e-outbreak-control/ba-p/4071894