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21.
You have a DNS server and you have updated your configuration - how do you tell the named to reload the configuration with the DNS admin tool?
The DNS admin tool is the rndc - you can use it to reload the configuration with - rndc reload
22.
What is the difference between the "crontab" and the "at" functionality?
Crontab (Cron command) is used to schedule a task daily at the same time (or times) repeatedly, on the other hand, the "at" command is used to schedule the task only to run only one time.
23.
How can you add a file system (partition) that will be mounted automatically when the Linux is booting?
In order to allow automatically mounting of a partition, you will need to add the partition to your fstab under /etc/fstab and provide Label, mount point, FS Type and options/permissions.
24.
You have decided to add 80.161.161.1 to your DNS servers (for DNS resolving), which file should be edited and what should
be added to this file?
The /etc/resolv.conf holds your DNS servers list; you need to add a new line "nameserver 80.161.161.1" at the end of the file.
25.
How can you set the eth0 interface to auto-negotiation on?
You can use the ethtool to configure the eth card: ethtool --change eth0 autoneg on.
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