Oracle Oracle Certifications 1Z0-460 Questions & Answers

• Question 31:

  What does the following line in the modprobe.conf file indicate? options netconsole netconsole = [email protected]/eth0, [email protected]/00:0C:A3:35:9C

  A. Netconsole logging is set up to send messages to a server at the IP address 192.168.1.200 by using the eth0 device.

  B. Netconsole logging is set up to send messages to a server at the IP address 192.168.1.200 by using the port number 6666.

  C. Netconsole logging is set up to send messages to a server at IP address 192.168.1.200 by using the UDP port 514.

  D. Netconsole logging is set up for two clients with IP addresses of 192.168.1.200 and 192.168.1.100 on this server.

  Correct Answer: B

  Example: options netconsole [email protected]/eth0,[email protected]/00:1A:A0:D2:55:66

  6666 => Server source port

  10.0.0.1 => Server IP eth0 => Server NIC 514 => Client listening port

  10.0.0.2 => Client IP 00:1A:A0:D2:55:66 => Client MAC

• Question 32:

  View the output below.

  As a root user, you run the two ulimit commands as shown in the output below. Why does the second ulimit command fail as shown in the output?

  

  A. The ulimit command cannot be run from the bash shell.

  B. The ulimit command syntax is not correct.

  C. The soft limit value of file description cannot be set greater than the hard limit value.

  D. The soft limit of file descriptions' value should always be less than 1024.

  Correct Answer: C

  Any user can set a soft limit to any value less than or equal to the hard limit. Any user can lower a hard limit. Only a user with appropriate privileges can raise or remove a hard limit.

  Note:

  *

  limit, ulimit, unlimit set or get limitations on the system resources available to the current shell and its

  descendents

  *

  Syntax:

  ulimit [- [HS] [c | d | f | n | s | t | v]] limit

  -H

  Displays or sets a hard limit.

  S

  -

  Displays or sets a soft limit.

  Reference: man ulimit

• Question 33:

  You have to find out the version of bash shell package installed on your Oracle Linux system. Which yum command can help you find the version information?

  A. # yum version bash

  B. # yum showversion bash

  C. # yum info bash

  D. # yum listversion bash

  Correct Answer: C

  Example:

  [oracle@oraclelinux6 ~]$ yum info bash

  Loaded plugins: refresh-packagekit, security Installed Packages Name : bash Arch : x86_64 Version : 4.1.2 Release : 9.el6_2 Size : 3.0 M Repo : installed From repo : ol6_u3_base Summary : The GNU Bourne Again shell URL : http://www.gnu.org/software/bash License : GPLv3+ Description : The GNU Bourne Again shell (Bash) is a shell or command language : interpreter that is compatible with the Bourne shell (sh). Bash : incorporates useful features from the Korn shell (ksh) and the

  C : shell (csh). Most sh scripts can be run by bash without : modification.

• Question 34:

  Which two statements describe Oracle ksplice?

  A. Ksplice actively applies kernel errata updates to the on-disk image and after a subsequent reboot changes take effect.

  B. Ksplice can be used to update Oracle Database software installed on a running Oracle Linux system.

  C. Ksplice actively applies kernel errata updates to the running Oracle Linux kernel image.

  D. Ksplice only works with the Red Hat Compatible Kernel.

  E. Ksplice allows customers to remain current with their OS vulnerability patches while at the same time minimizing downtime.

  Correct Answer: CE

  Ksplice is a free software extension of the Linux kernel which allows system administrators to apply security patches to a running kernel without having to reboot the operating system (C, not A) (a technique broadly referred to as Dynamic Software Updating). It only supports patches that don't make significant semantic changes to kernel data structures. Ksplice has been implemented for Linux on the x86-32 and x86-64 architectures. It was developed by Ksplice, Inc. until 21 July 2011, when Oracle acquired Ksplice and started offering support for Oracle Linux (not D). Support for Red Hat Enterprise Linux was dropped and turned into a free 30-day trial for RHEL customers as an incentive to migrate to Oracle Linux Premier Support.

• Question 35:

  Examine the following snippet from the rsyslog.conf file.

  kern.crit /dev/console kern.info; kern.!err /var/adm/kernel.log

  What do these two rules mean?

  A. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all kernel messages that come with priorities from info and up in the /var/adm/kernel.log file.

  B. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all kernel messages that come with priorities from info up to warning in the /var/adm/kernel.log file.

  C. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all messages that come with priorities from info and err in the /var/adm/kernel.log file.

  D. Direct all kernel messages of the priority crit and higher to machine console. Additionally, log all kernel messages that come with priorities other than info and err into the /var/adm/kernel.log file.

  Correct Answer: B

  Example:

  kern.* /var/adm/kernel kern.crit @finlandia;RFC3164fmt kern.crit /dev/console kern.info;kern.!err /var/adm/kernel-info

  The first rule direct any message that has the kernel facility to the file /var/adm/kernel.

  The second statement directs all kernel messages of the priority crit and higher to the remote host finlandia. This is useful, because if the host crashes and the disks get irreparable errors you might not be able to read the stored messages. If they're on a remote host, too, you still can try to find out the reason for the crash.

  The third rule directs these messages to the actual console, so the person who works on the machine will get them, too.

  The fourth line tells rsyslogd to save all kernel messages that come with priorities from info up to warning in the file /var/adm/kernel-info. Everything from err and higher is excluded.

• Question 36:

  You have to collect data by using the OS Watcher tool to help diagnose a performance issue on your Oracle Linux system. You need to collect data every 30 seconds by using this tool and archive this data for a period of three days. Which is the OS Watcher tool option that can be used to collect this data from your system?

  A. # ./startOSWbb.sh t 30 p 3

  B. # ./startOSWbb.sh 30 72

  C. # ./startOSWbb.sh int = 30 days = 3

  D. # ./startOSWbb.sh 30 3

  Correct Answer: B

  Example:

  ./startOSWbb.sh 60 24 collect every 1 minute and keep 24 hours of archive files.

• Question 37:

  Which file system is both new and now installed by default in Oracle Linux 6 with Unbreakable Enterprise Kernel (UEK)?

  A. ext4

  B. ext3

  C. zfs

  D. ext2

  E. fat64

  Correct Answer: A

  Oracle Linux 6 includes many new features, including:

  ext4 filesystem

  The ext4 filesystem is installed by default.

• Question 38:

  The ASMlib on Linux us designed to ___________.

  A. Make managing ASM volume easier.

  B. Make managing ASM volumes easier and provide a performance improvement over ASM volumes alone.

  C. Provide load balancing across multiple volumes.

  D. Allow the user to list contents of the volume from the OS command line.

  Correct Answer: B

  ASMLib is an optional support library for the Automatic Storage Management feature of the Oracle

  Database.

  ASMLib allows an Oracle Database using ASM more efficient and capable access to the disk groups it is

  using.

• Question 39:

  The change that are made by using echo command, like the one shown in the example below, are not persistent and disappear when the system us restarted. Which file should be modified to make configuration changes across reboots?

  # echo www.example.com > /proc/sys/kernel/hostname

  A. /etc/sys/sysct1.conf

  B. /etc/sysconfig.conf

  C. /etc/sysct1.conf

  D. /proc/sysct1.conf

  Correct Answer: A

  A configuration file exists for the purpose of persisting changes, named /etc/sysct1.conf. When booting, your server starts the procps service that reads this configuration file and applies all settings in it.

  Note:

  * If you've ever needed to change the hostname for Red Hat Linux, CentOS or similar operating systems, you can do so easily with one simple command.

  Just use the echo command to replace the contents of /proc/sys/kernel/hostname with your new host

  name.

  # echo hostname.com > /proc/sys/kernel/hostname

  Then restart the network interfaces:

  # /etc/init.d/network restart

  Shutting down interface venet0: [ OK ]

  Shutting down loopback interface: [ OK ]

  Bringing up loopback interface: [ OK ]

  Bringing up interface venet0: RTNETLINK answers: File exists RTNETLINK answers: File exists

  [ OK ]

  Now you can use the hostname command to verify that it has changed.

• Question 40:

  You run the following command as the root user to set properties of a network interface (eth0):

  # ifconfig eth0 192.0.2.102 netmask 255.255.255.0 up Setting network interface properties with the ifconfig utility is not persistent across system reboots. Which file would you edit to make settings and to make them persist across system reboots?

  A. /etc/sysconfig/network file

  B. /etc/sysconfig/network/ifcg-eth0 file

  C. /etc/sysconfig/network-scripts/ifcfg-eth0 file

  D. /etc/sysconfig/network-scripts/eth0 file

  Correct Answer: C

  Modify the eth0 config file Open the configuration using a text editor such as vi/vim, and make sure file read as follows for eth0 interface # vi /etc/sysconfig/network-scripts/ifcfg-eth0