[Free] 2018(Jan) Dumps4cert Testinsides Oracle 1z0-100 Dumps with VCE and PDF 51-60

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Oracle Linux 5 and 6 System Administration

Question No: 51

Which two statements are true about the Unbreakable Linux Network (ULN)?

  1. It is freely available to all Oracle Linux customers.

  2. It contains additional packages not found on the installation media.

  3. It contains only binary RPM packages.

  4. It contains both source and binary RPM packages.

  5. It is the only location to download errata.

  6. All Unbreakable Linux subscribers are allowed to deploy a local YUM repository.

Answer: B,D

Explanation: B: ULN subscribers will find security updates and additional bugfixes for

kernel and other packages. They will also be able to download useful extra packages not included in the original distribution.

D: You can also select to download the source RPM in addition to the binary RPMs.

Incorrect:

not A: How do I obtain a login for Unbreakable Linux Network (ULN)?

You may register for a ULN account via linux.oracle.com/register You will need the following:

An Oracle.com Single Sign on account. If you don#39;t have one already, the link above will guide you through the steps to create one

A valid Oracle Linux support or Oracle VM support CSI (customer support identifier). You may purchase Oracle Linux or Oracle VM support online via the Oracle Linux Store or via your sales representative.

Question No: 52

Which statements is true concerning Oracle Linux configuration files for users and groups?

  1. The /etc/passwd file contains hashed passwords for each user.

  2. The /etc/shadow file contains hashed passwords for each user.

  3. The GECOS field in /etc/passwd file may be empty.

  4. The /etc/group file contains the group name and the hashed group password.

Answer: B

Explanation: /etc/shadow file stores actual password in encrypted (one-way hashed) format for user#39;s account with additional properties related to user password i.e. it stores secure user account information

Question No: 53

Which two statements are true concerning the installation and configuration of the bootloader by the Anaconda installer, which is then used to boot Oracle Linux?

  1. The Linux Loader (LILO) bootloader may be chosen for installation.

  2. The bootloader must be password protected and Anaconda prompts for a password in all cases.

  3. The Grand Unified Bootloader (GRUB) is the only bootloader used by Oracle Linux.

  4. If previously installed operating systems are found on disk partitions that were not overwritten, then an attempt is made to configure the bootloader to be able to boot them.

  5. The bootloader is installed by default in the first partition of the disk.

    Answer: A,E

    Explanation: A (not C): Linux boot process from hard drive:

    1. PC initializion phase – BIOS, POST.

    2. PC starts boot loader – usually grub or lilo.

    3. The bootloader locates kernel image on the hard drive.

    4. The kernel decompresses and loads itself. Once finished it tries to mount the root filesystem. 5. When the root filesystem is mounted, /sbin/init is executed and continues booting the system using inittab and /etc/rc*.d scripts

      Question No: 54

      Examine these statements and their output taken right after successful install of Oracle Linux:

      [root@FAROUT /] rpm -q firstboot Firstboot -1.110.10-1.0.2.e16.x86_64

      [root @FAROUT /] # chkconfig – – list firstboot Firstboot 0:off 2:off 3:off 4:off 5:off 6;off

      [root@FAROUT /] # /etc/sysconfig/firstboot RUN_FIRSTBOOT=NO

      What is the conclusion?

      1. The option to run firstboot was deselected during Oracle Linux installation.

      2. The system was installed with desktop graphical packages and rebooted and the firstboot utility ran successful.

      3. Firstboot never ran in any run level because the service is turned off for all run levels.

      4. The system was installed without selecting desktop graphical packages, thereby disabling firstboot from running.

Answer: A

Explanation: Firstboot is set to off for all levels.

Example:

The rm command below remove or delate the firstboot file in order to make sure the firstboot program running when we restart or reboot the Fedora machine. [root@fedora ~]# rm /etc/sysconfig/firstboot

rm: remove regular file `/etc/sysconfig/firstboot#39;? y [root@fedora ~]#

Then check and make sure that firstboot program or firstboot service is run when your Fedora startup/boot up.

Check firstboot services

[root@fedora ~]# chkconfig -list firstboot firstboot 0:off 1:off 2:off 3:off 4:off 5:off 6:off [root@fedora ~]#

Question No: 55

Examine the extract of the /etc/nologin file and the /etc/pam.d/login file on server1:

[root@server1 ~] # cat /etc/nologin bob

smith

[root@server1 ~] # cat /etc/pam.d/login

accountrequiredpam_nologin.so accountincludesystem-auth

Which statement is true about users?

  1. Only the root user can log in to the system.

  2. Only users root bob and smith would be unable to log in to the system.

  3. All users, including the root user, would be permitted to log in to the system.

  4. All users, including the root user, would be unable to log in to the system.

Answer: A

Explanation: auth required pam_nologin.so – This is the final authentication step. It checks whether the /etc/nologin file exists. If it exists and the user is not root, authentication fails.

  • The /etc/nologin file contains the message displayed to users attempting to log on to a machine in the process of being shutdown.

  • the login program defines its service name as login and installs the /etc/pam.d/login PAM configuration file.

  • Question No: 56

    You recently updated the strace package to the latest version as shown:

    Dumps4Cert 2018 PDF and VCE

    What is the outcome of running this command?

    1. It downgrades the strace package to version 4.5.19-1.6.e16.

    2. It downgrades strace package to version 4.5.19-1.11.e16_3.2.

    3. It fails with an error because you cannot downgrade a package using the yum command.

    4. It fails with an error because there are multiple versions available to which Yum can downgrade the strace package.

    5. It will prompt you to select a version of the strace package that you want to downgrade.

    Answer: A

    Question No: 57

    Which three statements are true about the bash shell script#39;s capabilities and features?

    1. The s* shell variable holds the exit status of the last command executed in the foreground.

    2. The | | operator ensures that a command is run only if the command preceding the | | operator fails.

    3. If test quot;SMYVARquot; = prod and if [quot;SMYVARquot; *= prod ] are equivalent ways to test the value of the MYVAR variable in a shell script.

    4. If the first line of the script begins with #!/bin/sh, then the sh shell program is unable to interpret the script.

    5. The bash shell supports more than 10 command-line arguments.

    6. The amp;amp; operator ensures that a command is run regardless of the outcome of the command that preceded the amp;amp; operator.

    Answer: B,C,F

    Question No: 58

    Which two statements are true about signal handling in Oracle Linux?

    1. The pkill command kills a process by name.

    2. A process killed with the default signal always terminates gracefully if it: does not block the kill request.

    3. The kill command sends a sigkill (signal 9) by default to the process being killed.

    4. The kill command may send a termination signal to more than one process at a time.

    5. All signals may be blocked by a process.

    Answer: B,D

    Explanation: D: The kill command is used to send a termination signal to the specified process or group.

    Incorrect:

    Not A: The following example shows the xscreensaver process (2609) which is to be terminated.

    $ pgrep xscreen 2609

    $ kill 2609

    Though we use pgrep to find the PID of this process here we could have also used a PID from the output of top or ps.

    Not C: The kill command is used to send a termination signal to the specified process or group. The default termination signal is a SIGTERM (15) signal.

    Not E: When there a stubborn process trapping the kill command and refusing to terminate, the -9 (SIGKILL) signal should be used to kill the process. The -9 signal cannot be trapped by a process and ignored.

    Question No: 59

    Examine the command and output shown:

    bash-4.1# 1s

    1s: error while loading shared libraries: libselinux.so.1: cannot open shared object file: No such file or directory

    No files have been deleted from your system and you want to determine the cause of the error.

    Which two commands or utilities can help the root user diagnose this problem?

    1. ldd

    2. dmesg

    3. grep libselinux.so.1 /var/log/dmesg

    4. strace

    5. grep libselinux.so.1 /var/log/message

    Answer: A,D Explanation:

    To diagnose the problem, use the following commands: ldd /usr/bin/ls

    and ldd /cat

    strace -o /tmp/ls.strace -f su – root -c ls

    Reference: http://www.experts-exchange.com/OS/Unix/Q_25150132.html

    Question No: 60

    Which three Statements describe the capabilities and functions of the chkconfig command in Oracle Linux?

    1. It can be used to change the state of a service.

    2. It can be used to specify the run levels for which a service is to be activated.

    3. It can be used to list all services and their run levels-

    4. It can be used to check the status of a service to see if it is running.

    5. It can be used to add a service.

    Answer: B,C,E

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