When you use DNS to find a hostname using a particular IP address, which kind of DNS entry is involved?

Which one of the following lines would you expect to see in the file /etc/hosts.allow?

Which two of the following Class B IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose two)

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You are working an evening shift and want to look a which jobs are pending for the at command.
What command would you use?

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A user complains that his laptop shows the wrong time when it is not connected to the network.

What command must the superuser run to adjust the laptop’s clock without entering in BIOS?

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You want to create a boot floppy using a given image file on your hard disk. What utility would you use to do so?

What does the following command accomplish:
“export PATH=$PATH:$APPLICATIONS”

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You want to display a list of all last logged in users. The file /var/log/wtmp exists. Which command would you use?

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To prevent users from seeing who is logged in with the who command, you must remove the world readable but from the file /var/run ______.

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To exclude all log messages of a given logging facility, you should use a logging priority of: