Oracle Oracle Certifications 1Z0-460 Questions & Answers

• Question 11:

  

  What are the two benefits of configuring network interface bonding?

  A. aggregating two or more Network Interfaces (NICs) to act as one logical interface

  B. creating a static address that is bound to one NIC

  C. providing either failover or load-balancing to two or more Network Interfaces (NICs)

  D. binding a network interface to the embedded firewall (IPTables) for port filtering

  Correct Answer: AC

  Network bonding refers to the combination of network interfaces on one host for redundancy and/or increased throughput.

• Question 12:

  Examine the following kernel boot command-line parameters.

  kernel /vmlinuz-2.6.32-220.e16 ro root = /dev/VolGroup00/LogVol00 init = /bin/bash ether = 0, 0, eth1 rhgb quiet

  Which two statements are true?

  A. An unrecognized kernel boot command-line parameter has been used.

  B. The system will boot without password.

  C. Boot argument ether will force probing for a second ethernet card (NIC).

  D. It will not probe for any hard drive.

  Correct Answer: CD

  C: Ether parameter:

  The most common use of this parameter is to force probing for a second ethercard, as the default is to only

  probe for one (with 2.4 and older kernels). This can be accomplished with a simple:

  ether=0,0,eth1

  Note:

  *

  rhgb stands for redhat graphical boot. This is a GUI mode booting screen with most of the information hidden.

  *

  quiet parameter hides the majority of the boot messages before rhgb starts.

• Question 13:

  Examine the output of the yum.conf configuration file from o Oracle Linux 6 server.

  

  What does the "installonly_limit=3" option mean?

  A. Only three users can use the yum command simultaneously to install package on Oracle Linux 6 server.

  B. Only three Linux packages can be installed in one invocation of the yum command.

  C. Only three repository channels can be used for installing Linux packages.

  D. Only three versions of packages listed in installonlypkgs can be installed simultaneously.

  Correct Answer: D

  installonly_limit

  Number of packages listed in installonlypkgs to keep installed at the same time. Setting to 0 disables this feature. Default is '3'. Note that this functionality used to be in the "installonlyn" plugin, where this option was altered via. tokeep. Note that as of version 3.2.24, yum will now look in the yumdb for a installonly attribute on installed packages. If that attribute is "keep", then they will never be removed.

  Reference: yum.conf

• Question 14:

  Which two commands can be used on Oracle Linux to find the routing table and default gateway information of your network?

  A. netstat r

  B. route show

  C. cat /proc/route

  D. route n

  E. traceroute

  Correct Answer: AD

  A: netstat - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships

  D:

  *

  route - show / manipulate the IP routing table

  *

  route n -n show numerical addresses instead of trying to determine symbolic host names. This is useful if you are trying to determine why the route to your nameserver has vanished.

  *

  The output of the kernel routing table is organized in the following columns

  Destination

  The destination network or destination host.

  Gateway

  The gateway address or '*' if none set.

  Genmask

  The netmask for the destination net; '255.255.255.255' for a host destination and '0.0.0.0' for the default

  route.

  Incorrect:

  Not B: use route n. No subcommand show.

  Not E: traceroute - print the route packets trace to network host

• Question 15:

  The DBA tells you that the system is not overloaded but you can tell that the system us actively swapping. What command would you run to show this information to the DBA?

  A. # iotop

  B. # iostat 5 10

  C. # cat /proc/meminfo

  D. # vmstat 5 10

  Correct Answer: B

  *

  iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices, partitions and network filesystems (NFS).

  *

  The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.

  Incorrect:

  Not A: Related to kernel and processes.

  *

  iotop - simple top-like I/O monitor

  *

  iotop watches I/O usage information output by the Linux kernel (requires 2.6.20 or later) and displays a table of current I/O usage by processes or threads on the system.

  *

  iotop displays columns for the I/O bandwidth read and written by each process/thread during the sampling period. It also displays the percentage of time the thread/process spent while swapping in and while waiting on I/O. For each process, its I/O priority (class/level) is shown. In addition, the total I/O bandwidth read and written during the sampling period is displayed at the top of the interface.

  Not C: related to RAM usage.

  *

  The entries in the /proc/meminfo can help explain what's going on with your memory usage, if you know how to read it.

  *

  High-Level Statistics MemTotal: Total usable ram (i.e. physical ram minus a few reserved bits and the kernel binary code) MemFree: Is sum of LowFree+HighFree (overall stat) MemShared: 0; is here for compat reasons but always zero. Buffers: Memory in buffer cache. mostly useless as metric nowadays Cached: Memory in the pagecache (diskcache) minus SwapCache SwapCache: Memory that once was swapped out, is swapped back in but still also is in the swapfile (if memory is needed it doesn't need to be swapped out AGAIN because it is already in the swapfile. This saves I/O)

  Not D: vmstat - Report virtual memory statistics

• Question 16:

  You have mounted an Oracle Linux 6 ISO image (v33411-01.iso) on your system in the /mnt/iso/OL6u3/ Server directory. You want to use this image in your local yum repository configuration file and enable it. Which yum repository configuration file has the correct entries to use this image as a local repository?

  A. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/OL6u3/Server gpgcheck=1 enabled=0

  B. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/V33411-01.iso gpgcheck=1 enabled=1

  C. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/OL6u3/Server gpgcheck=1 enabled=1

  D. [ol6u3_base_media] name=Oracle Linux 6 Media baseurl=http:///mnt/iso/OL6u3/Server gpgcheck=1 enabled=1

  Correct Answer: A

  Example: Create a yum .repo file: cd /etc/yum.repos.d cat > ol63iso.repo << EOF [ol6_base_media] name=Oracle Linux 6 Media baseurl=file:///mnt/iso/ol63/Server

  gpgcheck=0

  enabled=1

  EOF

  #

  Incorrect:

  Not B: Specifiy the directory, not the iso file name.

  Not C: Enabled should be 0, not 1.

  Not D: Use file: not http: to specify the directory

• Question 17:

  Identify the two kernels that are shipped with Oracle Linux 6.

  A. Unbreakable Enterprise Kernel

  B. Unbeatable Enterprise Kernel 11g

  C. Red Hat Compatible Kernel

  D. Linux Compatible Kernel

  E. Solaris 11 Container Kernel

  Correct Answer: AC

  Oracle Linux 6 ships with two sets of kernel packages:

  *

  Unbreakable Enterprise Kernel [kernel-uek-2.6.32-100.28.5.el6] Only available on the x86_64 (64 bit) platform Installed and booted by default

  *

  Red Hat compatible Kernel [kernel-2.6.32-71.el6] Installed by default

  Reference: Oracle Linux 6 Release Notes

• Question 18:

  You want to add a README.txt file in the home directory of every new user that you create by using the useradd command on your Oracle Linux system. In which directory will you place the README.txt file so that it automatically gets copied to the new user's home directory when the user is created?

  A. /home/users

  B. /etc/default/useradd

  C. /etc/default

  D. /etc/skel

  Correct Answer: D

  -k, --skel SKEL_DIR The skeleton directory, which contains files and directories to be copied in the user's home directory, when the home directory is created by useradd. This option is only valid if the -m (or --create-home) option is specified.

  If this option is not set, the skeleton directory is defined by the SKEL variable in /etc/default/useradd or, by default, /etc/skel.

  Note:

  * useradd - create a new user or update default new user information Reference: man useradd

• Question 19:

  A system administrator wants to view all running processes on the system in real time, to find out what RAM has been allocating to each process. What system command should be used?

  A. ps ef

  B. ps ax

  C. top

  D. meminfo

  Correct Answer: C

  top - display Linux tasks

  The top program provides a dynamic real-time view of a running system. It can display system summary

  information as well as a list of tasks currently being managed by the Linux kernel. The types of system

  sum- mary information shown and the types, order and size of information displayed for tasks are all user

  configurable and that configuration can be made persistent across restarts.

  Incorrect:

  Not A, Not B:

  ps displays information about a selection of the active processes.

  To see every process on the system using standard syntax:

  ps -e

  ps -ef

  ps -eF

  ps -ely

  To see every process on the system using BSD syntax:

  ps ax

  ps axu

  Not D: meminfo - provide information about memory

  The meminfo() function provides information about virtual and physical memory particular to the calling

  process. The user or developer of performance utilities can use this information to analyze system memory

  allocations and develop a better understanding of the factors affecting application performance.

• Question 20:

  Which three statements are true about the Kickstart installation method?

  A. The Kickstart installation method helps to speed boot time after the system restarts.

  B. A Kickstart file is created for every installation.

  C. The Kickstart Configurator can be used to create or make changes to a kickstart file.

  D. The Kickstart method allows for unattended and more standardized installations.

  E. The Kickstart method of configuration is performed after the installation of the host operating system.

  Correct Answer: BCD

  BC:

  * A kickstart installation requires a kickstart file that contains the answers to every question asked during an interactive installation. Kickstart files can be created in one of three ways:

  / Perform an interactive installation. Once complete you will find the Kickstart configuration file for the

  installation you just completed in the "/root/anaconda-ks.cfg" file. This can be amended and used for

  subsequent installations. (B)

  / Create a Kickstart file in a text editor manually, or based on a copy of a previous file.

  / Use the Kickstart Configurator. (C)

  D:

  * Kickstart installations provide an automated alternative to the normal interactive installations of RHEL and Oracle Linux. The automation of installation and post installation configuration steps represents a considerable time saving in situations where many similar installations are performed.

  Reference: Kickstart - Automated Installations of RHEL and Oracle Linux