Why is /etc/shadow not world readable if the passwords are stored in an encrypted fashion?

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What command enables a network interface according to distribution-specific configuration, such as /etc/network/interfacesor /etc/sysconfig/network-scripts/ifcfg-eth0?
(Specify only the command without any path or parameters.)

On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?

Which of the following options in the chrony configuration file define remote time sources? (Choose two.)

Which if the following tools, used for DNS debugging, reports not only the response from the name sever but also details about the query?