Oracle Oracle Certifications 1Z0-100 Questions & Answers

• Question 121:

  Which two statements are true about administering the use of the Sudo command in Oracle Linux?

  A. visudo will never save the /etc/sudoers file if there are syntax errors in the file after editing.

  B. visudo prompts for an action if there are syntax errors in the /etc/sudoers file after editing.

  C. Using vi to edit /etc/sudoers opens the file read only.

  D. Multiple administrators may edit the /etc/sudoers file simultaneously using visudo but only one may save the edited result.

  E. Multiple administrators may edit the /etc/sudoers file simultaneously using vi but only one may save the edited result.

  Correct Answer: AE

  A: visudo parses the sudoers file after the edit and will not save the changes if there is a syntax error.

  E: visudo locks the sudoers file against multiple simultaneous edits

  Note:

  *

  sudo is configured through the file /etc/sudoers. Like with most Linux configuration files, any text following a pound sign in the sudoers file is a comment. Within the sudoers file, sets of commands, groups of users, and associate users or groups with command sets can be configured.

  *

  If you want to grant certain users authority to be able to perform specific administrative tasks via sudo, use the visudo command to modify the /etc/sudoers file.

  The sudo command offers a way to grant partial or full access to the root account without the users needing the root password.

• Question 122:

  You have a single network adapter called eth0.

  DEVICE = eth0 BOOTPROTO=DHCP HWADR=BC:305B:C5:63;F1 NM_CONTROLLED=no ONBOOT=YES TYPE=Ethernet PEERDNS=no UUID=C9dba2e8-9faf-4b77-bbe2-92dd81dda1f9

  Which two Statement:; are true concerning eth0 based on this configuration?

  A. DHCP is used to obtain a lease on an IP address.

  B. The dhclient command may only be used to obtain a lease at boot time.

  C. dhclient does not override the contents of /etc/resolv.conf.

  D. DNS is not used to resolve host names for this adapter.

  E. dhclient overrides the contents of /etc/resolv.conf.

  Correct Answer: A

  A: BOOTPROTO=DHCP

  C: PEERDNS=answer

  where answer is one of the following:

  yes -- Modify /etc/resolv.conf if the DNS directive is set. If using DHCP, then yes is the default.

  no -- Do not modify /etc/resolv.conf.

  Note: The "/etc/resolv.conf" file is used to configure the location of the DNS servers to be used for name resolution.

• Question 123:

  Which four statements are true about the proc and sysfs filesystem?

  A. The sysfs filesystem contains information about processes.

  B. The proc filesystem contains information about CPUs.

  C. The proc filesystem contains information about memory.

  D. The sysfs filesystem contains information about CPUs.

  E. The sysfs filesystem contains information about memory.

  F. The proc filesystem contains information about the installer parameters.

  Correct Answer: ABCF

  *

  sysfs is the Virtual Filesystem created during the 2.6 Kernel release cycle to show device information as procfs did not do this type of information that well.

  Memory etc has not been ported to sysfs as it was never intended to show that type of information so it is unlikely it will be ported at all.

  *

  sysfs is a virtual file system provided by Linux. Sysfs exports information about devices and drivers from the kernel device model to user space, and is also used for configuration.

• Question 124:

  You want sendmail to deliver mail for these users:

  [email protected] to mailbox jsmith1 [email protected] to mailbox jsmith2 [email protected] to mailbox jsmith3

  In which sendmail configuration database can this requirement be defined?

  A. /etc/aliases

  B. /etc/mail/userdb

  C. /etc/mail/virtusertable

  D. /etc/mail/domaintable

  E. /etc/mail/genericstable

  Correct Answer: C

  /etc/mail/virtusertable This database file maps mail addresses for virtual domains and users to real mailboxes. These mailboxes can be local, remote, aliases defined in /etc/mail/aliases, or files. This allows multiple virtual domains to be hosted on one machine.

  The following example demonstrates how to create custom entries using that format:

  [email protected] root [email protected] [email protected] @example.com joe

• Question 125:

  What is the purpose of Setting AUTOINSTALL to YES /etc/uptrack.conf?

  A. To install Ksplice kernel updates during the reboot of a system

  B. To install updates to the Ksplice software Itself during a system reboot

  C. To enable the uptrack cron job to install Ksplice kernel updates whenever they become available

  D. To enable Ksplice to automatically install the kernel rpm whenever new Ksplice kernel updates become available

  E. To enable Ksplice to install Ksplice kernel updates and new kernel RPMS whenever they become available

  Correct Answer: D

  If you'd like Ksplice Uptrack to automatically install updates as they become available, run:

  sh install-uptrack YOUR_ACCESS_KEY --autoinstall in place of the above install-uptrack command, or set "autoinstall = yes" in your /etc/uptrack/uptrack.conf after installation.

  Note: Automatic updates

  You can configure your systems to automatically install updates as they become available. To enable autoinstall, set autoinstall = yes in your /etc/uptrack/uptrack.conf, or pass the --autoinstall flag during installation.

  Autoinstall is our most popular configuration. It is a scalable way to ensure that updates get installed quickly as they become available, regardless of when they are released.

  Please note that enabling autoinstall does not mean the Uptrack client itself is automatically upgraded. You will be notified via e-mail when a new Uptrack client is available, and it can be upgraded through your package manager.

• Question 126:

  Which statement is true concerning the /etc/sysconfig directory and its files and subdirectories?

  A. The contents are always the same for a specific version of the Oracle Linux Kernel.

  B. The file /etc/sysconfig/init is used by upstart to control the attributes of the tty devices that get started.

  C. The directory /etc/sysconfig/network-scripts contains files that must not be modified while the network is up.

  D. The files only contain default values for certain daemon processes.

  Correct Answer: B

  The /etc/sysconfig/init file controls how the system appears and functions during the boot process.

  Note: The /etc/sysconfig directory contains files that control your system's configuration. The contents of this directory depend on the packages that you have installed on your system

• Question 127:

  Examine the routing table:

  

  Which three statements are true concerning the routing of IP packets?

  A. Traffic to 192.168.180.180 is routed via eth1.

  B. Traffic to 192.168.180.240 is routed via eth1.

  C. Traffic to 192.168.0.42 is routed via eth2.

  D. Traffic to 192.168.42.42 is routed via eth2.

  E. Traffic to 192.168.42.42 is routed via eth0.

  F. Traffic to 192.168.180.180 is routed via eth0.

  Correct Answer: BD

• Question 128:

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

  

  What is the outcome of running this command?

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

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

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

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

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

  Correct Answer: A

• Question 129:

  Which two Statements are true concerning the configuration and use of cron and anacron?

  A. Anacron jobs are used to make sure cron jobs run if the system had been down when they were meant to run.

  B. All crontabs are held in the /etc/cron.d directory.

  C. Cron jobs may run as frequently as once a minute.

  D. Anacron jobs may run as frequently as once a minute.

  E. The crond daemon looks for jobs only in /etc/crontab.

  Correct Answer: CE

  Note: Anacron is the cron for desktops and laptops.

  Anacron does not expect the system to be running 24 x 7 like a server.

  When you want a background job to be executed automatically on a machine that is not running 24 x 7,

  you should use anacron.

  Incorrect:

  not D: /etc/anacrontab file has the anacron jobs mentioned in the following format.

  period delay job-identifier command

  Field 1 is Recurrence period: This is a numeric value that specifies the number of days.

  1 daily

  7 weekly

  30 monthly

  N This can be any numeric value. N indicates number of days

• Question 130:

  What is the main advantage of the Oracle Unbreakable Enterprise Kernel compared with the Red Hat compatible kernel?

  A. It is more secure and, therefore, more difficult to hack.

  B. It has a lower Mean Time Between Failures.

  C. It provides higher availability for applications by reducing Mean Time to Recovery.

  D. It scales better for more CPUS, memory, and Infiniband network connections.

  Correct Answer: D

  The Unbreakable Enterprise Kernel, for those who want to leverage the latest features from mainline Linux and boost performance and scalability.

  The Red Hat Compatible Kernel, for those who prefer strict Red Hat kernel ABI (kABI) compatibility.