Which protocol is used to send messages by the ping command? 09/18/2018 – by Mod_GuideK 0 Which protocol is used to send messages by the ping command? A. NTP B. FTP C. TCP D. ICMP E. HTTP F. LDAP SHOW ANSWERSCorrect Answer: D Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.