201-450 sample questions

Question 1

Which of the following configuration files are used by tcpwrapper?

Accepted Answer

/etc/hosts.allow and /etc/hosts.deny

Answer

/etc/tcpwrapper.allow and /etc/tcpwrapper.deny

Answer

/etc/tcpd.allow and etc/tcpd.deny

Answer

/etc/service.allow and /etc/service.deny

Answer

/etc/access.allow and /etc/access.deny

Question 2

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

Accepted Answer

Isof

Answer

contains

Answer

Is_in

Answer

lmhosts

Question 3

Which of the following properties should be recorded in order to monitor the quality of a network link? (Choose two.)

Accepted Answer

Effective Latency

Accepted Answer

Bandwidth in both directions

Answer

Number of nodes using the link

Answer

Number of used TCP por

Answer

Number of IPv4 and IPv6 packet

Question 4

What information is found in the following excerpt from the file /proc/mdstat? (Choose two.)

Accepted Answer

One of the disks in /dev/md0 has failed and a spare disk is used to recreate full redundancy

Accepted Answer

The information [UU_] means, that the raid is missing one disk and is not fully redundant

Answer

The information [3/2] means that 3 RAID disks belong to the array and 2 disks are spare. Together they equal the number of available disks

Answer

The device is using version 1.2 metadata to allow LILO and GRUB Legacy to use /dev/mdO as the boot partition. This would not have been necessary with GRUB2

Answer

The spare disk /dev/sda1 is used to restore full redundancy after the current recovery

Question 5

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

Accepted Answer

vmstat

Answer

pidof

Answer

isof

Answer

free

Answer

memshow

Question 6

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

Accepted Answer

Transfers per second

Answer

Terrabit per second

Answer

Total data per second

Answer

Terrabyte per second

Answer

t raffic per second

Question 7

How can the label root be added to the ext4 filesystem on /dev/sda1?

Accepted Answer

tune2fs -L root /dev/sda1

Answer

echo ‘root’ > /proc/fs/sda1/label

Answer

relabel/dev/sda1 root

Answer

labelfs --device Zdev/sda1 root

Question 8

Which of the following commands displays the physical path of the kernel module named dummy?

Accepted Answer

modprobe -i dummy

Answer

depmod -n dummy

Answer

modpath -v dummy

Answer

modshow -p dummy

Answer

modinfo -n dummy

Question 9

Due to extreme system use, a Linux system requires some additional swap space. To initialize 5 GB of additional swap space, which combination of commands should be used?

Accepted Answer

dd if=/dev/zero of=/tmp/swapfile bs=1024 count=5120000; mkswap /tmp/swapfile; swapon /tmp/swapfile

Answer

dd if=/dev/zero of=/tmp/swapfile bs=1024 count=5120000; mkswap /tmp/swapfile; mount /tmp/swapfile

Answer

mkswap /tmp/swapfile 512000; swapon /tmp/swapfile

Answer

touch -5G /tmp/swapfile; swapon /tmp/swapfile

Answer

dd if=/dev/zero of=/tmp/swapfile bs=1024 count=5120000; swapon /tmp/swapfile

Question 10

Which of the following is a CD-ROM filesystem standard?

Accepted Answer

ISO 9660

Answer

SROFS

Answer

ISO 8859

Answer

ROM-EO

Answer

OSI 9660

201-450 Sample Questions & Answers

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201-450 Sample Questions & Answers

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