Oracle 1Z0-460 Online Practice Questions and Exam Preparation

Oracle 1Z0-460 Online Questions & Answers

• Question 41:

  As user bob, you have logged in to the system on a terminal and issued the following command to make the top command run in the background.

  [bob@host - ] topand

  You exit from the terminal and log back as bob into the system at the same terminal. How is the background job affected?

  A. The background job gets the foreground as soon as bob logs into the system.
  B. The background job is suspended temporarily from the job and resumes when user bob logs back in to the system.
  C. The background job starts running in the background again as soon as bob logs into the system.
  D. The background job will not be affected.
  E. The background job is deleted from the job pool and does not get listed using jobs command.
  E. The background job is deleted from the job pool and does not get listed using jobs command.

• Question 42:

  DTrace is being ported from Solaris to Oracle Linux. Which three statements are true for the DTrace tool?

  A. DTrace allows static and dynamic tracing of your applications and your kernel.
  B. DTrace tool is used to compile debug kernel modules and device drivers
  C. DTrace allows you to dynamically define probe points on the fly.
  D. DTrace probes and probe points are usually defined by the user using scripts written in a language called D.
  E. DTrace tool is based on the strace Linux tool and includes both user and kernel strace features.
  A. DTrace allows static and dynamic tracing of your applications and your kernel.
  C. DTrace allows you to dynamically define probe points on the fly.
  D. DTrace probes and probe points are usually defined by the user using scripts written in a language called D.

  ---

  A: DTrace is a comprehensive dynamic tracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time.

  C: Key benefits and features of DTrace on Oracle Linux include:

  / Designed to work on finding performance bottlenecks / (C) Dynamically enables the kernel with a number of probe points, improving ability to service software / Enables maximum resource utilization and application performance / Fast and easy to use, even on complex systems with multiple layers of software

  D: Testers write tracing programs (also referred to as scripts) using the D programming language (not to be confused with other programming languages named "D"). The language, a subset of C, includes added functions and variables specific to tracing. D programs resemble awk programs in structure; they consist of a list of one or more probes (instrumentation points), and each probe is associated with an action. These probes are comparable to a pointcut in aspect-oriented programming.

• Question 43:

  View the output below. As oracle user, you run the following command on your Oracle Linux 6 system:

  [oracle@dbhost ~ ] $

  [oracle@dbhost ~] $ nice - - 10 ./myscript.sh and

  [1] 2735 [oracle@dbhost ~] $ nice: cannot set niceness: permission denied

  Why is the nice command failing?

  A. Shell scripts cannot be assigned a negative nice value.
  B. There is already another process running with same niceness value on this system.
  C. A negative nice value can be set by the root user.
  D. A nice value of -10 is not the permissible niceness range.
  C. A negative nice value can be set by the root user.

  ---

  Only a privileged user may run a process with lower niceness: $ nice -n -1 nice nice: cannot set niceness: Permission denied $ sudo nice -n -1 nice Note: Sudo stands for either "substitute user do" or "super user do" (depending upon how you want to look at it). What sudo does is incredibly important and crucial to many Linux distributions. Effectively, sudo allows a user to run a program as another user (most often the root user).

• Question 44:

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

  ---

  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 45:

  You found a message on a public discussion forum mentioning a Vulnerability (for example, CVE-2006- 5794), which could affect some versions of OpenSSH in Linux distribution. Identify the command that would allow you to see whether this CVE has been applied.

  A. rpm q changelog openssh | grep 5794
  B. yum listcvew openssh
  C. rpm -qa | grep openssh | grep 5794
  D. yum sec -list cves
  A. rpm q changelog openssh | grep 5794

  ---

  *

  The command rpm -q --changelog rpm displays a detailed list of information (updates, configuration, modifications, etc.) about a specific package. This example shows information about the package rpm. However, only the last five change entries in the RPM database are listed. All entries (dating back the last two years) are included in the package itself. This query only works if CD 1 is mounted at /media/cdrom:

  rpm -qp --changelog /media/cdrom/suse/i586/rpm-3*.rpm

  *

  Is the patch RPM suitable for my system?

  To check this, first query the installed version of the package. For pine, this can be done with

  rpm -q pine pine-4.44-188

  Incorrect: not C:

  * qa stands for "Query All"

  Assuming you are attempting to find out if you have the Very Secure FTP Daemon installed, you want:

  rpm -qa | grep vsftp

  rpm -qa will show you all installed RPMs, piping it through grep will limit the list to RPMs containing the string "vsftp".

• Question 46:

  The /proc file system is a pseudo-file system, which is used as an interface to kernel data structures. Which four statements are true about the /proc file system?

  A. The /proc file system contains a numerical subdirectory for each running process.
  B. The /proc file system contains a hierarchy of special files that represent the current state of the kernel.
  C. The /proc file system has to be mounted by the system administrator after a reboot.
  D. The /proc/cpuinfo virtual file identifies the type of processor used by your system.
  E. The /proc directory contains information about system hardware and any running processes.
  F. The files in the /proc directory are read-only system files that cannot be changed.
  A. The /proc file system contains a numerical subdirectory for each running process.
  B. The /proc file system contains a hierarchy of special files that represent the current state of the kernel.
  D. The /proc/cpuinfo virtual file identifies the type of processor used by your system.
  E. The /proc directory contains information about system hardware and any running processes.

  ---

  *

  The /proc file system exists in slightly different variations on Linux and the Solaris OS. On both systems, / proc is a directory containing files whose names are the process IDs of the current active processes on the system (A). Each PID-named file is in turn a directory. /proc on Linux has various other directories besides processes. Most of these deal with processors, devices, and statistics on the system. On Linux, one looks in /proc to find information about processes, processors, devices, machine architecture, and so on (E).

  *

  The /proc is a virtual file system that contains files that show the status of the Linux operating system kernel. Most of the files have a size of 0 bytes, but they actually contain a large amount of data. The timestamps of these virtual files changes as the contents of the files are updated by the OS.

  *

  The following virtual files provide an indication, at the moment they are being viewed, about the system hardware: n /proc/partitions: Gives the size and name of partitions

  n /proc/meminfo: Memory statistics and segment sizes

  n /proc/mounts: List of the mount points

  n /proc/uptime: Uptime of the system

  n /proc/interrupts: List of interrupts on the system

  D: The contents of the files can be seen with the classical command cat, thereby viewing the information of the CPU.

  linux-mlpb:~ # cat /proc/cpuinfo

  processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 9 model name : Intel(R) Pentium(R) M processor 1700MHz stepping : 8 cpu MHz : 1694.501 cache size : 1024 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 up pebs bts bogomips : 3408.43 clflush size : 64

  linux-mlpb:~ # cat /proc/cpuinfo

  processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 9 model name : Intel(R) Pentium(R) M processor 1700MHz stepping : 8 cpu MHz : 1694.501 cache size : 1024 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 up pebs bts bogomips : 3408.43 clflush size : 64

• Question 47:

  Which three parameters of a network interface can you modify by using the NetworkManager tool on your Oracle Linux 6 system?

  A. IPv4 settings
  B. IPv6 settings
  C. Netconsole settings
  D. MTU settings
  E. IP Proxy settings
  A. IPv4 settings
  B. IPv6 settings
  D. MTU settings

  ---

  

  Note:

  1 Right-click the NetworkManager icon in the notification area at the top-right corner of the Red Hat desktop and click "Edit Connections."

  Click the "System eth0" connection on the wired tab and click "Edit." Click the "IPv4 Settings" tab.

• Question 48:

  Your 32-bit i686 architecture system in registered with the Oracle Unbreakable Linux Network. RPM package example -1 .0.0-1 is already installed and the application is used constantly. You want to download the latest version of the example RPM package. You do not want to install the package until you have coordinated with the program's current users. Which option will allow you to download until you have coordinated with the program's current users. Which option will allow you to download the latest version of the RPM package, but not install it?

  A. # rpm Uvh http://linix.oracle.com/rpms/i686/example-1.0.1-1.i686.rpm
  B. # yum no-update example
  C. # yumdownloader example
  D. # yum get example-1.0.1
  C. # yumdownloader example

  ---

  yumdownloader is a program for downloading RPMs from Yum repositories.

  Synopsis

  yumdownloader [options] package1 [package2...]

  Note:

  * yum - Yellowdog Updater Modified

  yum is an interactive, rpm based, package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on "repository" metadata. It can also perform installation of new packages,

  removal of old packages and perform queries on the installed and/or available packages among many other commands/services (see below). yum is similar to other high level package managers like apt-get and smart.

• Question 49:

  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
  A. Unbreakable Enterprise Kernel
  C. Red Hat Compatible Kernel

  ---

  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 50:

  The sshd service running and you execute the following command:

  # chkconfig sshd off

  What happens when you run this chkconfig command?

  A. The sshd service disabled only for runlevel 5.
  B. The sshd service id disabled for runlevels 2, 3, 4, and 5, but the ssh service is still available until the next reboot.
  C. The sshd service is disabled for runlevels 2, 3, 4, and 5 and ssh service is stopped.
  D. The sshd service is disabled only for current runlevel.
  B. The sshd service id disabled for runlevels 2, 3, 4, and 5, but the ssh service is still available until the next reboot.

  ---