Secure Shell (SSH) is a protocol used to securely access remote devices over an unsecured network. It provides encrypted command-line access and is a lightweight and secure method of remote administration.

A . Site-to-site VPN connects entire networks, not just a single host.

B . Telnet is not secure; it transmits data (including credentials) in plaintext.

C . Console access is direct via serial cable, not remote.

Reference:

CompTIA Network+ N10-009 Official Objectives: 2.6 -- Configure and troubleshoot remote access.