SSH
Secure Shell — an encrypted protocol on port 22 for remote command-line administration.
SSH (Secure Shell) operates on TCP port 22, using asymmetric key exchange during the handshake to establish a symmetric session key that then encrypts the entire data stream. It authenticates users with passwords or, more securely, with public/private key pairs listed in authorized_keys files. Network+ candidates should know SSH as the direct replacement for Telnet, which sends credentials in plaintext on port 23. Unlike HTTPS (port 443), SSH is terminal/CLI-based and is the standard for managing routers, switches, and Linux servers remotely. SCP and SFTP both run over SSH for encrypted file transfers.
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