By default, administrative users can authenticate with a firewall by using only a password. After they are authenticated, these users are known by the generic username enable_1.
The firewall prompts you for the password in Telnet and SSH sessions, but not in console sessions. On the console, a user is immediately placed at the unprivileged level.
With SSH sessions, users are prompted for a username and password. You can use the username pix as the generic username.
The following sections present the configuration steps needed to authenticate administrative users based only on a password or on a username and password pair, and to authenticate end users initiating traffic through the firewall.