201-450 Online Practice Questions and Answers

Which of the following is a side effect of extensive usage of swap space?

A. The root filesystem may become full because swap space is always located on the system root partition.

B. The overall system performance may degrade because of heavy hard disk use and memory reorganization.

C. Since processes always exist completely in either RAM or swap, regular RAM may become unused if the kernel does not move processes back from the swap space to memory.

D. The memory may become fragmented and slow down the access to memory pages. However, this can be kept to a minimum by the regular use of memfrag -d.

E. Applications need to restart because their virtual memory addresses change to reflect memory relocation to the swap address area.

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

A. It uses a library of plugins.

B. A master server connects to a collectd service on each machine to retrieve the information.

C. It collects its own information on each server and sends that to a master server.

D. It makes SNMP queries to the clients being monitored.

How can the kernel parameter for the maximum size of the shared memory segment (shmmax) be changed to 2GB (2147483648 Bytes) on a running system? (Choose TWO correct answers.)

A. Edit /etc/shmmax and set the parameter to 2147483648.

B. sysctl shmmax=2147483648

C. sysctl kernel.shmmax=2147483648

D. echo 2147483648 > /proc/sys/kernel/shmmax

E. export kernel.shmmax=2147483648

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. maxcpus=1

B. usecpus=1

C. smpcpus=1

D. vcpumx=1

Where is the LILO boot loader code typically installed on a system with only a single Linux installation and no other operating systems?

A. In the master boot record.

B. In the boot sector.

C. In the /boot directory.

D. At the start of the kernel.

A system has one hard disk and one CD writer which are both connected to SATA controllers. Which device represents the CD writer?

A. /dev/hdb

B. /dev/sdd

C. /dev/scd1

D. /dev/sr0

E. /dev/sr1

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

A. recover

B. lost+found

C. back

D. lost

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

A. iwconfig

B. iwlink

C. iwscan

D. iwifi

E. iw

Which of the following files will be looked for and used by GNU make, if one of them exists, unless a different file is specified on the command line when trying to compile software from source code? (Choose TWO correct answers.)

A. configure

B. config.h.in

C. makefile

D. Makefile

E. Makefile.in

Which one of these directories should not be backed up?

A. /backup

B. /etc

C. /opt

D. /proc

E. /var/log

The following command has just been run successfully: cd /opt; tar xvf /dev/nst0;

What will happen if the command sequence is run again?

A. An error saying that there is no tape present is generated because the tape has been ejected after being used.

B. The contents of /opt will be restored again.

C. The entire contents of /opt will be replaced with the contents of the next file on the tape.

D. The contents of /opt will have additional content added from the next file on the tape.

Which command is used to create a ISO9660 filesystem? (Specify ONLY the command without any path or parameters.)

What keyword is missing in the following line from /etc/fstab in order to make a USB flash device writeable by the user fred when mounted: /dev/sda1 /mnt/usbflash vfat defaults,users,______=fred,umask=022, 0 0

(Provide the option name only without any settings)

According to the tcpdump output below, what is the IP address of the client host?

02:12:40.511381 IP 192.168.246.11.1045 > 192.168.246.1.22: S 3838532429:3838532429(0) win 5840

02:12:40.511540 IP 192.168.246.1.22 > 192.168.246.11.1045: S 1209330085:1209330085(0) ack 383853 2430 win 5792

02:12:40.511755 IP 192.168.246.11.1045 > 192.168.246.1.22: . ack 1 win 1460

02:12:40.515122 IP 192.168.246.1.22 > 192.168.246.11.1045: P 1:26(25) ack 1 win 5792

02:12:40.515511 IP 192.168.246.11.1045 > 192.168.246.1.22: . ack 26 win 1460

02:12:40.515952 IP 192.168.246.11.1045 > 192.168.246.1.22: P 1:23(22) ack 26 win 1460

Which directory contains system-specific systemd unit files? (Specify the full path to the directory.)