Answer Posted / jkohlend

6 levels is correct,XIn Red Hat Linux, the default boot
level is 3, unless booting into an X Windows login, the
default boot level then is 5.

Runlevels Generic mode
0 halt
1 Single user mode
2 Multiuser, without Networking
3 Full multiuser mode
4 unused
5 X11
6 reboot

You can view the settings of default runlevel
in /etc/inittab. The command /sbin/chkconfig --list is used
to display a list of all runlevels and services.

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