What is the default behavior of any listener for TLS communication? 01/29/2021 – by Mod_GuideK 0 What is the default behavior of any listener for TLS communication? A. preferred-verify B. off C. preferred D. required SHOW ANSWERSCorrect Answer: B Explanation/Reference: Reference: https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118954-config-esa-00.html