SSH (Secure Shell) encrypts data communications for secure remote login and management of network devices, ensuring all console connections are encrypted. * Why Not B (LDAP): LDAP is used for directory services and does not encrypt by default. * Why Not C (FTPS): FTPS encrypts file transfers, not console communications. * Why Not D (SMTP): SMTP is used for email transmission, not for securing login sessions. CompTIA A+ Exam Reference: Core 1 (220-1101), Section 2.7, network security protocols.