Dell Managed PDU LED - Manual (Page 225)

USER’S GUIDE
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Command Line Interface Access and Security
Users with Administrator or Device User accounts can access the command line
interface through Telnet or Secure Shell (SSH), depending on which is enabled. (An
Administrator can enable these access methods by selecting the
Administration tab,
then Network on the top menu bar and access under the Console heading on the left
navigation menu.) By default, Telnet is enabled. Enabling SSH automatically disables
Telnet.
Telnet for basic access. Telnet provides the basic security of authentication by user
name and password, but not the high-security benefits of encryption.
SSH for high-security access. If you use the high security of SSL for the Web
interface, use Secure Shell (SSH) for access to the command line interface. SSH
encrypts user names, passwords and transmitted data.
The interface, user accounts, and user access rights are the same whether you access
the command line interface through SSH or Telnet, but to use SSH, you must first
configure SSH and have an SSH client program installed on your computer.