201-450 Sample Questions Answers

What command discards unused blocks on a mounted file system in order to support SSD devices? (Specify ONLY the command without any path or parameters.)

If all of the following files and/or symlinks exist in a SysV-init runlevel directory, which of the following will be executed first when booting the system directly into the runlevel?

What happens if the Linux kernel can't mount the root filesystem when booting?

A server requires a GRUB2 boot option which will always boot to runlevel 1. Which line of a GRUB2 configuration file starts the beginning of the settings needed to make this new choice available?

After changing the default runlevel in the SysV-init configuration file, the system boots in a different than intended runlevel. Where else could this different runlevel be defined?

The main configuration file for autofs has this entry:

/home /etc/auto.home

What is the meaning of the /etc/auto.home file?

Consider the following /etc/fstab file:

/dev/hda1 swap swap defaults 0 0

/dev/hda2 / ext2 defaults 1 1

/dev/hda3 /home ext2 defaults 1 2

none /proc proc defaults 0 0

/dev/sdb1 /media/usb0 vfat user,noauto 0 0

What is one of the possible commands that an ordinary (non-root) user can use to mount the /dev/sdb1 partition on the /media/usb0 mount point? (Please enter the command with all parameters and/or options but without any file system type options.)

How can the label root be added to the ext2 filesystem on /dev/sda1?

Which command turns an existing ext2 filesystem non-destructively into an ext3 filesystem? (Specify ONLY the command without any path or parameters.)

Which of the following commands will securely copy the directory ./fyf/ to /var/tmp/ on the remote host deltaur using the remote user account kevin?

A Linux server running systemd booted to rescue.target for maintenance. Which commands are used to restore the server to its usual target? (Choose two.)

What is the device name for the first SCSI tape drive on a system when used without automatic rewinding after each write operation? (Please specify the full path to the device.)

Which of the following commands will erase the contents of the /dev/sdb3 partition?

A regular user, joe, has just run:

./configure && make && make install

to build and install a program. However, the installation fails. What could be done to install the program? (Choose TWO correct answers.)

Which of the following are common backup systems used in Linux? (Choose TWO correct answers.)

In the output of sar –b, what does tps stand for?

Which of the following commands lists IPv4 addresses and MAC addresses of network nodes that the local system has seen on its directly connected IP networks?

Which command will report information on memory usage, paging and block input/output?

In the following output, what is the 5 minute load average for the system?

# uptime

12:10:05 up 18 days, 19:00, 2 users, load average: 0.47, 24.71, 35.31

In the below example output, which columns detail the percent of time the CPU spent running non-kernel code and the percent of time the CPU spent running kernel code? (Choose TWO correct answers.)

# vmstat 1 100

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----

r b swpd free buff cache si so bi bo in cs us sy id wa

0 0 0 282120 134108 5797012 0 0 0 2 0 0 0 0 100 0

0 0 0 282120 134108 5797012 0 0 0 0 1007 359 0 0 100 0

0 0 0 282120 134108 5797012 0 0 0 0 1117 577 0 0 100 0

0 0 0 282120 134108 5797012 0 0 0 0 1007 366 0 0 100 0

In capacity planning exercises, which tools assist in listing and identifying processes of interest? (Choose TWO correct answers.)

Which commands below are useful to collect data about remote filesystem connections? (Choose TWO correct answers.)

What mechanism does collectd use to gather monitoring information on systems?

Which of the following wireless tools can be used to check the wireless network link quality? (Choose TWO correct answers.)

Which program lists information about files and network connections opened by processes? (Specify ONLY the command without any path or parameters.)

What should be done to ensure a client machine uses the recursive nameserver running on the IP address 192.168.0.1? (Choose TWO correct answers.)

Under which of the following circumstances would the command ping output the string (DUP!)?

A network client has an ethernet interface (eth0) configured with an IP address in the subnet 192.168.0.0/24. This subnet has a router, with the IP address 192.168.0.1, that connects this subnet to the Internet. What needs to be done on the client to enable it to use the router as its default gateway? (Choose TWO correct answers.)

Which of the following files are used to resolve hostnames to IP addresses? (Choose TWO correct answers.)

Which command is used to unload a single module currently loaded by the kernel without unloading any modules that it depends upon? (Specify the command with or without path information)

What is the correct parameter to pass to the kernel at boot time to force it to use only one of the available processors?

A new kernel version needs to be compiled to use a new feature. If the old kernel configuration file is available, which make target creates a configuration file for the new kernel based on the configuration of the old kernel?

A database application requires a maximum shared memory segment (shmmax) of 2GB (2147483648 Bytes). Which configuration file should be modified to set this kernel parameter permanently? (Specify the full name of the file, including path.)

Which of the following command sequences can be used to extract files contained in a initramfs file (/boot/initramfs) which is used by the kernel at boot time?

Which commands are used to load modules into the Linux kernel? (Choose TWO correct answers.)

What does a 0 in the last field (fsck order) of /etc/fstab indicate about the filesystem?

Which of the following are common Linux filesystem types used for root partitions? (Choose THREE correct answers.)

Why is the root file system mounted read-only during boot and remounted with write permission later on?

Which keyword is used in the /etc/inittab file to define the SysV-init default system runlevel?

Which directory in /dev/disk/ can be used to determine the UUID of a connected hard disk?

What mount option must be used in /etc/fstab when mounting an iSCSI target?

Where would fsck put any unreferenced file or file fragments on a ext4 filesystem?

Which single command will simulate a failed device within a RAID 5 array?

The IDE hard drive /dev/hda does not have DMA enabled. Which command must be run to enable DMA on it?

Which of the following commands is used to set up a RAID volume?