Cisco Updated 300-720 Exam Questions and Answers by reign

• System: This is the default list of trusted certificate authorities that is provided by Cisco and updated automatically. It contains the certificates of well-known and widely used certificate authorities, such as VeriSign, Thawte, and GoDaddy.
• Custom: This is the list of additional certificate authorities that you can add manually or import from a file. It allows you to trust certificates that are issued by your own or third-party certificate authorities that are not included in the system list.

To allow the Cisco ESA to encrypt an email using the CRES (Cisco Registered Envelope Service), a provisioned email encryption profile must be configured on Cisco ESA. A provisioned email encryption profile is a type of encryption profile that specifies how messages are encrypted using CRES, such as the encryption key strength, the notification options, the branding settings, etc.

References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 12-4.

With DomainKeys or DKIM email authentication, the sender signs the email using public key cryptography. Configuring DomainKeys and DKIM Signing A signing key is the private key stored on the appliance. https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_chapter_010101.html?bookSearch=true

With DomainKeys or DKIM email authentication, the sender signs the email using public key cryptography. Configuring DomainKeys and DKIM Signing A signing key is the private key stored on the appliance. https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_chapter_010101.html?bookSearch=true