XK0-005 Question #1111: Real Exam Question with Answer & Explanation

Question

A Linux administrator installed a new network adapter and temporarily disabled the network service from starting on boot. The partial output of chkconfig is as follows: Which of the following commands BEST describes how the administrator should re-enable the network service?

Options

• Achkconfig --level 0 network on
• Bchkconfig --level 0-6 network on
• Cchkconfig --level 6 network on
• Dchkconfig --level 12 network on
• Echkconfig --level 345 network on

Explanation

To re-enable a service like 'network' on boot for typical multi-user operation using chkconfig, the administrator should specify runlevels 3, 4, and 5 as 'on.' These runlevels represent text-mode multi-user, unused (often symbolic for 3/5), and graphical multi-user modes, respectively, where the network service is generally required.

Common mistakes.

• A. Runlevel 0 is halt/poweroff mode, so enabling a service for this runlevel makes no sense for normal operation and would not re-enable it on boot for general use.
• B. Enabling the service in all runlevels (0-6) would also enable it for halt (0), single-user (1), reboot (6) modes, which is unnecessary and potentially problematic for a network service.
• C. Runlevel 6 is reboot mode, so enabling a service for this runlevel makes no sense for normal operation and would not re-enable it on boot for general use.
• D. Runlevels 1 and 2 are single-user mode and multi-user without network filesystems, respectively. While 2 might be used, typically 3, 4, and 5 are desired for a network service.

Concept tested. Service management with chkconfig and runlevels

Reference. https://www.redhat.com/sysadmin/runlevels-init-system

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