What is the default behavior of any listener for TLS communication?

What is the default behavior of any listener for TLS communication?
A . preferred-verify
B . off
C . preferred
D . required

View Answer

Answer: B

Explanation:

The default behavior of any listener for TLS communication is B. off. This means that TLS is not allowed for incoming connections to the listener and connections to the listener do not require encrypted Simple Mail Transfer Protocol (SMTP) conversations. This is stated in the web search result 1. To enable TLS for a listener, you need to configure the Use TLS option in the mail flow policy settings for the listener on the Mail Policies > HAT Overview page1. You can choose from three different settings for TLS: No, Preferred, or Required1.

Reference: https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118954-config-esa-00.html