The security level for "Entire" is the highest, followed by "Simple (Limitation)", and at the bottom, "Simple (All)".
Entire
Select this to authenticate all print jobs and remote configuration.
The printer authenticates all printer jobs and remote settings, and it cancels jobs and settings that fail authentication.
To print in an environment that does not support authentication, select [Simple (All)] or [Simple (Limitation)].
Simple (All)
Select this if you want to print with a printer driver or device that cannot be identified by the printer or if authentication is not required for printing.
Printer jobs and settings without authentication information are performed without being authenticated.
The printer authenticates printer jobs and remote settings that have authentication information, and it cancels the jobs and settings that fail authentication.
Unauthorized users may be able to use the printer since printing is allowed without user authentication.
Simple (Limitation)
Select this to restrict the range of [Simple (All)].
You can specify whether to apply [Simple (All)] to parallel connection, USB connection, and the user's IPv4 address. The range of application to IPv6 addresses can be configured from Web Image Monitor.
The specified range can be printed regardless of the authentication. Authentication will be applied to addresses outside this range.