Which run levels should never be declared as the default run level when using SysV init? (Choose TWO correct answers.)
Which run levels should never be declared as the default run level when using SysV init? (Choose TWO correct answers.)
Run level 0 is used to halt the system and therefore should never be declared as the default run level because the system will not boot up. Similarly, run level 6 is used to reboot the system, and setting it as the default run level would result in the system continuously rebooting without completing the boot process. Therefore, both run levels 0 and 6 should never be set as the default run level when using SysV init.
Run level 0 is to Halt the system Run level 6 is to restart the system. https://manpages.ubuntu.com/manpages/precise/man7/runlevel.7.html
Option A. 0 and Option E. 6 should never be declared as the default run level when using SysV init. Option A: Runlevel 0 is used to halt the system. It is not appropriate to use it as the default run level because the system will not be able to boot up. Option B: Runlevel 1 is used to boot the system into single-user mode, which is a minimal environment used for maintenance tasks. It is not appropriate to use it as the default run level because the system will not be fully functional. Option C: Runlevel 3 is used to boot the system into multi-user mode with networking, which is a normal operating environment for most systems. It is appropriate to use it as the default run level. Option D: Runlevel 5 is used to boot the system into multi-user mode with networking and a graphical user interface (GUI). It is appropriate to use as the default run level on systems that are intended to run a GUI. Option E: Runlevel 6 is used to reboot the system. It is not appropriate to use it as the default run level because the system will not be able to boot up.
Absolutely correct
yep, 0 and 6