Question 1

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

Options :

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

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

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

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

E : mkswap /tmp/swapfile 512000; swapon /tmp/swapfile

Answer: C

Question 2

A web application server contains 64GB of RAM and two swap partitions on normal harddisk drives, each with a size of 64 GB. Within the last month, the average number of usersessions on this server has grown by 20 percent. At the same time, the average usage ofRAM increased from 65 to 75 percent, while the swap space is almost not used at all. It isexpected that the number of user sessions will continue to increase by about 15 to 20percent each month. Which of the following reactions would be appropriate in response tothese observations? (Choose two.)

Options :

A : Delay any hardware upgrade until there is a significant consumption of swap space toensure an efficient usage of the available hardware

B : Create a RAID 1 device on the two swap partitions to avoid data loss in case swapspace has to be used in the future

C : Consider the installation of an additional application server to distribute the load if theexpected growth continues over several months

D : Move the web application’s scripts and content a ram disk in order to ensure fast access and to avoid the need for swap space

E : Update the hardware to increase the amount of available RAM to avoid using swap space

Answer: A,C

Question 3

Which files are updated as devices are mounted and unmounted to provide information onthe currently mounted devices and the options used? (Choose TWO correct answers.)

Options :

A : /proc/dtab

B : /etc/mtab

C : /etc/fstab

D : /proc/mounts

E : /proc/devices

Answer: C

Question 4

How is the source code for the main Linux kernel modules distributed?

Options :

A : It is included with the Linux kernel source code.

B : The kernel modules are downloaded on demand as they are used during compilation.

C : The kernel modules have their own release cycle and can be maintained separatelyfrom the Linux kernel source.

D : It is provided as a separate download alongside the Linux kernel source code of thesame version.

Answer: A

Question 5

In this example output, which descriptions match the purpose of the free, buff and cachecolumns? (Choose THREE correct answers.)# vmstat 1 100procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----r b swpd free buff cache si so bi bo in cs us sy id wa0 0 0 282120 134108 5797012 0 0 0 2 0 0 0 0 100 00 0 0 282120 134108 5797012 0 0 0 0 1007 359 0 0 100 00 0 0 282120 134108 5797012 0 0 0 0 1117 577 0 0 100 00 0 0 282120 134108 5797012 0 0 0 0 1007 366 0 0 100 0

Options :

A : Used swap space

B : RAM available for filesystem buffers

C : Available free RAM

D : RAM used for buffers

E : RAM used for filesystem cache

Answer: A,C,D

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