Oracle 1Z0-460 Online Practice Questions and Exam Preparation

Oracle 1Z0-460 Online Questions & Answers

• Question 61:

  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.
  C. Ksplice actively applies kernel errata updates to the running Oracle Linux kernel image.
  E. Ksplice allows customers to remain current with their OS vulnerability patches while at the same time minimizing downtime.

  ---

  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 62:

  Identify three valid modes for SELinux.

  A. Disabled
  B. Enforcing
  C. Running
  D. Permissive
  E. Enabled
  F. High_level
  G. Label_only
  A. Disabled
  B. Enforcing
  D. Permissive

  ---

  SELinux has three modes:

  Enforcing: SELinux policy is enforced. SELinux denies access based on SELinux policy rules. Permissive:

  SELinux policy is not enforced. SELinux does not deny access, but denials are logged for actions that would have been denied if running in enforcing mode. Disabled: SELinux is disabled. Only DAC rules are used.

• Question 63:

  You have executed the following commands as the root user:

  # find /home | cpio o H tar F root@HostA: /dev/nst0 - - rsh command = /usr/bin/ssh

  What is the purpose of issuing this command?

  A. To archive the contents of the /home directory in the tar format to a remote host system's tape drive device /dev/nst0
  B. To archive the contents of the /home directory in the cpio format to a remote host system's tape device /dev/nst0
  C. To archive the contents of the /home directory in the cpio and tar formats to a remote system's tape drive device /dev/nst0
  D. To extract the contents of the /home directory from the tape drive device /dev/nst0
  A. To archive the contents of the /home directory in the tar format to a remote host system's tape drive device /dev/nst0

  ---

  Note:

  *

  The cpio command is one of standard Unix backup utilities. It stands for "copy in/out." It is much less well known and more rarely used Unix utility in comparison with tar.

  *

  The cpio command is one of standard Unix backup utilities. It stands for "copy in/out." It is much less well known and more rarely used Unix utility in comparison with tar.

  * -H format. Here tar

• Question 64:

  Which two statements describes the capabilities of Oracle Manager Ops Center product?

  A. Oracle Enterprise Manager Ops Center can provide management services for Oracle Linux servers.
  B. Oracle Enterprise Manager Ops Center provides management services only for Oracle Solaris operating system and SPARC servers.
  C. Oracle Enterprise Manager Ops Center contains tools to debug Oracle Linux kernel dump files.
  D. Oracle Enterprise Manager Ops Center includes built-in integration with My Oracle Support with automatic servers request generation.
  A. Oracle Enterprise Manager Ops Center can provide management services for Oracle Linux servers.
  D. Oracle Enterprise Manager Ops Center includes built-in integration with My Oracle Support with automatic servers request generation.

  ---

  Oracle Enterprise Manager Ops Center 12c is a foundational offering in the Oracle Enterprise Manager 12c solution. It introduces unique capabilities to strengthen Oracle Enterprise Manager 12c's ability to establish, manage, and support enterprise quality clouds delivered in an Infrastructure-as-a-Service model. With the launch of Oracle Enterprise Manager Ops Center 12c, Oracle Systems' customers utilizing SPARC, X86, Oracle Solaris, Oracle Linux (A), Oracle ZFS Storage Appliance, Oracle Switches, and both Oracle VM technologies can accelerate private cloud adoption faster at a lower cost. Oracle Enterprise Manager Ops Center 12c provides a comprehensive solution for operating system, firmware and BIOS configuration, bare metal and virtual machine provisioning, hardware fault analysis, automatic My Oracle Support service request generation (D), performance management, all while leveraging integrated diagnostics with automatic server pool resource policies.

• Question 65:

  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
  B. # iostat 5 10

  ---

  *

  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 66:

  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
  C. # yum info bash

  ---

  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 67:

  View the following GRUB command or the output of fixing the GRUB boot problem:

  

  Based on the output, which statement is true?

  A. The GRUB command sequence restores GRUB from the first partition on the second hard disk.
  B. The GRUB command sequence does not restore GRUB.
  C. GRUB command sequence restores GRUB from the second partition on the first hard disk.
  D. The GRUB command sequence verifies the stage1 on the first partition on first hard disk.
  C. GRUB command sequence restores GRUB from the second partition on the first hard disk.

  ---

  hd0,1 indicates the first hard drive and the second partition.

  Note:

  *

  grub - the grub shell

  Enter the GRand Unified Bootloader command shell.

  *

  In the following example we assume that the boot partition is located at /dev/hda5 and that GRUB must be installed on the first disk's MBR.

  grub> root (hd0,4) Filesystem type is ext2fs, partition type 0x83 grub> setup (hd0) Checking if "/boot/grub/stage1" exists... yes Checking if "/boot/grub/stage2" exists... yes Checking if "/boot/grub/e2fs_stage1_5" exists... yes Running "embed /boot/grub/e2fs_stage1_5 (hd0)"... 23 sectors are embedded. succeeded Running "install /boot/grub/stage1 (hd0) (hd0)1+23 p (hd0,4)/boot/grub/stage2 /boot/grub/menu.lst"... succeeded Done. grub> quit The first command includes the location of the boot partition, thus indicating where the boot loader files are located. The second command installs GRUB on the MBR. For this purpose, a file called stage1_5 is used to grant GRUB access to the file system on the boot partition.

• Question 68:

  A system administrator wants to enable packet without making the changes permanent. What command would he use to complete this action?

  A. Echo 1> /proc/sys/net/ip_forward/
  B. Echo 1> /proc/sys/net/ipv4_ip_forward
  C. Echo 1 > /etc/sysconfig/sys/net/ipv4/ip_forward
  D. Echo 0 > /proc/sys/net/ipv4/ip_forward
  B. Echo 1> /proc/sys/net/ipv4_ip_forward

  ---

  The '1' in "/proc/sys/net/ipv4/ip_forward" enables IP forwarding. A '0' signifies IP forwarding is disabled.

• Question 69:

  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
  C. top

  ---

  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 70:

  Finding a directive issued by your organization listing several important CVEs (Common Vulnerability and Exposures), you find one for Linux OpenSSH (CVE-2006-5764), which might apply to your oracle Linux systems. What command would help ensure that a patch has been applied to close this vulnerability on an Oracle Linux 6 system running OpenSSH server?

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