The SSH-Telnet CLI package supports two SSH client authentication methods:
The SSH-Telnet CLI package requires an SSH client that is comparable to the SSH client in OpenSSH 2.0 or higher. The OpenSSH 2.0 client supports SSH protocol versions 1.3, 1.5, and 2.0.
An SSH client that is comparable to the SSH client in OpenSSH 2.0 or higher supports SSH protocols 1 and 2. A typical configuration is to make protocol 2 primary, with fall back to protocol 1 if the SSH client detects that protocol 2 is not supported by the SSH server.
Both protocols support password and public-key (and other) authentication methods, but protocol 2 is preferred because it provides additional components for confidentiality and integrity. Protocol 1 lacks a strong component for ensuring the integrity of the connection.