1Z0-460 Online Practice Questions and Answers

Correct Answer: C

*

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

Correct Answer: C

From the top exhibit we see that npviewer.gin uses 73.4% of the available CPU.

Note:

*

sar - Collect, report, or save system activity information.

*

The sar command writes to standard output the contents of selected cumulative activity counters in the

operating system. The accounting system, based on the values in the count and interval parameters,

writes information the specified number of times spaced at the specified intervals in seconds.

*

sar u 2 5

Report CPU utilization for each 2 seconds. 5 lines are displayed.

Correct Answer: BCD

B: Your system must have access to the internet to install Ksplice. If you are using a proxy, set the proxy in your shell:

export http_proxy=http://proxy.company.com:port export https_proxy=http://proxy.company.com:port

CD: Once you have an access key run the following commands as root, replacing YOUR_ACCESS_KEY with the access key you received upon sign-up:

wget -N https://www.ksplice.com/uptrack/install-uptrack sh install-uptrack YOUR_ACCESS_KEY uptrack-upgrade y

E: 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.

Reference: Ksplice, Installation instructions

Correct Answer: D

To configure the Linux system to use the MD5 algorithm, enter: # authconfig --passalgo=MD5 --update

Note: The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512 under CentOS or Redhat Enterprise Linux 5.4?

You need to use authconfig command to setup SHA-256/512 hashing. This command provides a simple method of configuring /etc/sysconfig/network to handle NIS, as well as /etc/passwd and /etc/shadow, the files used for shadow password support. Basic LDAP, Kerberos 5, and SMB (authentication) client configuration is also provided.

Display Current Hashing Algorithm

Type the following command: # authconfig --test | grep hashing

Sample outputs:

password hashing algorithm is md5 Configure Linux Server To Use The SHA-512 To configure the Linux system to use the SHA-512 algorithm, enter: # authconfig --passalgo=sha512 --update

Correct Answer: ACD

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.

Correct Answer: BCD

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

Correct Answer: D

-k, --skel SKEL_DIR The skeleton directory, which contains files and directories to be copied in the user's home directory, when the home directory is created by useradd. This option is only valid if the -m (or --create-home) option is specified.

If this option is not set, the skeleton directory is defined by the SKEL variable in /etc/default/useradd or, by default, /etc/skel.

Note:

* useradd - create a new user or update default new user information Reference: man useradd

Correct Answer: AD

A: netstat - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships

D:

*

route - show / manipulate the IP routing table

*

route n -n show numerical addresses instead of trying to determine symbolic host names. This is useful if you are trying to determine why the route to your nameserver has vanished.

*

The output of the kernel routing table is organized in the following columns

Destination

The destination network or destination host.

Gateway

The gateway address or '*' if none set.

Genmask

The netmask for the destination net; '255.255.255.255' for a host destination and '0.0.0.0' for the default

route.

Incorrect:

Not B: use route n. No subcommand show.

Not E: traceroute - print the route packets trace to network host

Correct Answer: CD

C: Ether parameter:

The most common use of this parameter is to force probing for a second ethercard, as the default is to only

probe for one (with 2.4 and older kernels). This can be accomplished with a simple:

ether=0,0,eth1

Note:

*

rhgb stands for redhat graphical boot. This is a GUI mode booting screen with most of the information hidden.

*

quiet parameter hides the majority of the boot messages before rhgb starts.

Correct Answer: B