Oracle 1Z0-460 Online Practice Questions and Exam Preparation

Oracle 1Z0-460 Online Questions & Answers

• Question 11:

  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
  A. ext4

  ---

  Oracle Linux 6 includes many new features, including:

  ext4 filesystem

  The ext4 filesystem is installed by default.

• Question 12:

  As a root user, you executed the following command on your Oracle Linux 6 server:

  [root@host] # strace - o /tmp/diag.out sh diag.sh

  Which statement describes the purpose of this command?

  A. It collects the memory and swap space metrics when the diag.sh scripts runs.
  B. It collects the operating system metrics when the diag.sh script runs.
  C. It records the memory usage and CPU usage information of the processes when the diah.sh script runs.
  D. It records the system calls, which are called by the processes when the diag.sh script runs.
  D. It records the system calls, which are called by the processes when the diag.sh script runs.

  ---

  *

  strace - trace system calls and signals

  In the simplest case strace runs the specified command until it exits. It intercepts and records the system calls which are called by a process and the signals which are received by a process. The name of each system call, its arguments and its return value are printed on standard error or to the file specified with the -o option.

  *

  strace is a useful diagnostic, instructional, and debugging tool. System administrators, diagnosticians and trouble-shooters will find it invaluable for solving problems with programs for which the source is not readily available since they do not need to be recompiled in order to trace them. Students, hackers and the overly- curious will find that a great deal can be learned about a system and its system calls by tracing even ordinary programs. And programmers will find that since system calls and signals are events that happen at the user/kernel interface, a close examination of this boundary is very useful for bug isolation, sanity checking and attempting to capture race conditions.

  Each line in the trace contains the system call name, followed by its arguments in parentheses and its return value. An example from stracing the command ''cat /dev/null'' is:

  open("/dev/null", O_RDONLY) = 3 Errors (typically a return value of -1) have the errno symbol and error string appended. open("/foo/bar", O_RDONLY) = -1 ENOENT (No such file or directory) Signals are printed as a signal symbol and a signal string. An excerpt from stracing and interrupting the command ''sleep 666'' is: sigsuspend([] --- SIGINT (Interrupt) --+++ killed by SIGINT +++ Reference: man strace

• Question 13:

  You have to mount the Oracle Linux ISO image file OracleLinux R6 U2 Server X86_64- dvd.iso to the / media/cdrom mount point. Which command will help you mount the Oracle Linux ISO image file?

  A. # mount OracleLinux R6 U2 Server X86_64-dvd.iso /media/cdrom
  B. # mount t DVD OracleLinux R6 U2-Server-X86_64-DVD.iso/media/cdrom
  C. # mount /dvd/OracleLinux -R6 -U2- Server=X86_64-dvd.iso /media/cdrom/OracleLinux-R6- UI-Server- X86_64-dvd.iso
  D. # mount 0 ro, loop oracleLinux R6 U2 Server X86_64 dvd.iso /media/cdrom
  D. # mount 0 ro, loop oracleLinux R6 U2 Server X86_64 dvd.iso /media/cdrom

  ---

  Mount the DVD iso of the desired update of Oracle Linux Release 5. Use the following command for mounting the DVD media inserted in /dev/cdrom

  # mount -r -o loop -t iso9660 /dev/cdrom /mnt

  Use following command to mount iso image file

  # mount -o loop /mnt

• Question 14:

  View the exhibit.

  

  Examine the grub.conf file snippet in the Exhibit. Which statement is true if your Linux system boots by using this grub.conf file?

  A. GRUB will boot, by default, the first kernel entry of this grub.conf file.
  B. GRUB will prompt you to select the kernel to be booted because the default parameter is set to 0.
  C. GRUB will boot the kernel specified in the inittab file of the system.
  D. GRUB will boot, by default, the second kernel entry of this grub.conf file.
  A. GRUB will boot, by default, the first kernel entry of this grub.conf file.

  ---

  According the grub .conf file you have got 8 seconds to choose whether to boot the first entry.

  Now if you want to change, and let say you want the second grub entry as booting system by default, just change the line:

  default=0

  by

  default=1

• Question 15:

  What does the following btrfs command do? $ sudo btrfs subvolume snapshot src src-01

  A. Creates snapshots of the src src-01 subvolumes
  B. Creates a snapshot of the src-01 subvolumes in src
  C. Creates the src and src-01 subvolumes and takes a snapshot of these subvolumes
  D. Creates a snapshot of the src subvolumes in src-01
  D. Creates a snapshot of the src subvolumes in src-01

  ---

  *

  To create a snapshot use

  sudo btrfs subvolume snapshot /mnt/@ /mnt/@_snapshot

  this will create a snapshot of the @ subvolume named @_snapshot located also in the top of the btrfs tree.

  *

  btrfs subvolume snapshot [/]

  Create a writable snapshot of the subvolume with the name in the directory.

• Question 16:

  You have to aggregate two network interfaces, eth0 and eth1, into a single logical interface such as bond0. Which option shows the four configuration files that need to be configured to set up this bonding?

  A. /etc/sysconfig/network-scripts/ifcfg-bond0 /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/idfg-eth1 /proc/bonding.conf
  B. /etc/sysconfig/network-scripts/ifcfg-bond0 /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/idfg-eth1 /etc/modeprobe.d/bonding.cfg
  C. /etc/sysconfig/network/ifcfg-bond0 /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth1 /etc/modprobe.d/bonding.conf
  D. /etc/sysconfig/network-scripts/ifcfg-bond0 /etc/sysconfig/network-scripts/eth0 /etc/sysconfig/network-scripts/eth1 /etc/bonding.conf
  C. /etc/sysconfig/network/ifcfg-bond0 /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth1 /etc/modprobe.d/bonding.conf

  ---

  *

  Step #1: Create a Bond0 Configuration File

  Red Hat Enterprise Linux (and its clone such as CentOS) stores network configuration in /etc/sysconfig/ network-scripts/ directory. First, you need to create a bond0 config file as follows: # vi /etc/sysconfig/network-scripts/ifcfg-bond0

  *

  Step #2: Modify eth0 and eth1 config files

  Open both 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

  *

  Step # 3: Load bond driver/module

  Make sure bonding module is loaded when the channel-bonding interface (bond0) is brought up. You need to modify kernel modules configuration file: For each configured channel bonding interface, there must be a corresponding entry in your new /etc/ modprobe.d/bonding.conf file.

• Question 17:

  Examine the sar command below. Your Oracle Linux system has one CPU. What does the runq- sz column of this output convey about your system?

  

  A. CPU is bottleneck because the run queue size is greater than the number of CPUs on your system.
  B. The average of three processes are only using the CPU on your system and hence the CPU is not a bottleneck.
  C. CPU is not a bottleneck because the run queue size indicates the number of CPU bound processes on your system.
  D. CPU is a bottleneck because the run queue size indicates that adequate memory is not allocated.
  A. CPU is bottleneck because the run queue size is greater than the number of CPUs on your system.

  ---

  *

  Use the sar -q command to report the following information:

  The Average queue length while the queue is occupied.

  The percentage of time that the queue is occupied.

  *

  The following list describes the output from the -q option.

  runq-sz

  The number of kernel threads in memory that are waiting for a CPU to run. Typically, this value should be less than 2. Consistently higher values mean that the system might be CPU-bound.

  %runocc

  The percentage of time that the dispatch queues are occupied.

  swpq-sz

  Swap queue of processes for the sar command.

  %swpocc

  Swap queue of processes for the sar command.

• Question 18:

  Identify the option with two files that are found in the /etc/sysconfig directory.

  A. /etc/sysconfig/autofs and/etc/sysconfig/authconfig
  B. /etc/sysconfig/ifcfg-eth0 and/etc/sysconfig/atd
  C. /etc/sysconfig/resolv.conf and/etc/sysconfig/network
  D. /etc/sysconfig/resolv.conf and/etc/sysconfig/grub.conf
  A. /etc/sysconfig/autofs and/etc/sysconfig/authconfig

  ---

  *

  The /etc/sysconfig/autofs file defines custom options for the automatic mounting of devices.

  *

  The /etc/sysconfig/authconfig file sets the kind of authorization to be used on the host.

  Note: * /etc/sysconfig/network

  Used to configure networking options.

  Incorrect:

  Not C, Not D:

  *

  The program that resolves hostnames to IP addresses reads a file called resolv.conf. This file is located in /etc/resolv.conf directory.

• Question 19:

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

  ---

  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

• 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.
  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.

  ---

  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