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| Section | Weight | Objectives |
|---|---|---|
| The Linux Operating System | 20% | - System Architecture - Processes and Services - Hardware and Drivers - File Systems and Hierarchy Standard |
| The Power of the Command Line | 25% | - Basic Shell Scripting - Archiving and Compression - I/O Redirection and Pipelines - Text Processing |
| The Linux Community and a Career in Open Source | 15% | - Open Source Software and Licensing - Linux Distributions - Applications and Support - Linux History and Philosophy |
| Security and File Permissions | 20% | - Basic Security Concepts - File Permissions and Ownership - User and Group Management |
| Finding Your Way on a Linux System | 20% | - Creating, Moving and Deleting Files - Using Directories and Listing Files - Command Line Basics |
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48. Frage
A new server needs to be installed to host services for a period of several years. Throughout this time, the server should receive important security updates from its Linux distribution.
Which of the following Linux distributions meet these requirements? (Choose two.)
Antwort: C,E
Begründung:
Explanation
Ubuntu Linux LTS and Red Hat Enterprise Linux are two Linux distributions that meet the requirements of hosting services for a period of several years and receiving important security updates from their Linux distribution. LTS stands for Long Term Support, which means that these versions of Ubuntu Linux are supported by Canonical, the company behind Ubuntu, for five years with security patches, bug fixes, and software updates1. Red Hat Enterprise Linux is a commercial Linux distribution that offers a stable and secure platform for enterprise applications, with a 10-year life cycle and regular security updates from Red Hat, the company behind RHEL2. Fedora Linux, Debian GNU/Linux Unstable, and Ubuntu Linux non-LTS are not suitable for the requirements, because they have shorter support cycles and are more focused on providing the latest features and software versions, rather than stability and security. Fedora Linux releases a new version every six months and each version is supported for 13 months3. Debian GNU/Linux Unstable is the development branch of Debian, which is constantly updated with new packages and changes, but is not intended for production use4. Ubuntu Linux non-LTS releases a new version every six months and each version is supported for nine months1. References:
* Ubuntu release cycle | Ubuntu
* Red Hat Enterprise Linux Life Cycle - Red Hat Customer Portal
* Fedora Release Life Cycle - Fedora Project Wiki
* Debian Unstable - Debian Wiki
49. Frage
Members of a team already have experience using Red Hat Enterprise Linux. For a small hobby project, the team wants to set up a Linux server without paying for a subscription. Which of the following Linux distributions allows the team members to apply as much of their Red Hat Enterprise Linux knowledge as possible?
Antwort: C
Begründung:
Explanation
CentOS is a Linux distribution that is based on the source code of Red Hat Enterprise Linux (RHEL). It is a free and open-source community-supported OS that provides an enterprise-level computing platform. CentOS is fully compatible with RHEL and can run the same applications and packages. Therefore, CentOS allows the team members to apply as much of their Red Hat Enterprise Linux knowledge as possible for their hobby project. References:
* Linux Essentials Version 1.6 Objectives1, Topic 1.1: Linux Evolution and Popular Operating Systems, Subtopic: Linux Distributions
* Linux Essentials Version 1.6 Exam Preparation Guide2, Section 1.1: Linux Evolution and Popular Operating Systems, Page 7
* CentOS Website3, About CentOS Linux
* Red Hat Enterprise Linux derivatives - Wikipedia4
50. Frage
Which operator in a regular expression matches the preceding character either zero or one time?
Antwort: D
Begründung:
The operator that matches the preceding character either zero or one time in a regular expression is the question mark (?). This operator is also known as the optional quantifier, because it makes the preceding character or group of characters optional. For example, the regular expression colou?r matches both color and colour, because the u is optional. The question mark can also be used to modify other quantifiers, such as * (zero or more), + (one or more), or {m,n} (between m and n times), to make them non-greedy, meaning they will match the shortest possible string instead of the longest. For example, the regular expression .*? matches any character zero or more times, but as few as possible. The question mark is one of the basic regular expression operators covered in the Linux Essentials certification program from the Linux Professional Institute (LPI). Reference:
Linux Essentials - Linux Professional Institute (LPI)
Regular Expressions:Difference between 'optional occurrence' and 'zero ...
51. Frage
Which command copies the contents of the directory /etc/, including all sub-directories, to /root/?
Antwort: C
Begründung:
The correct command to copy the contents of the directory /etc/, including all sub-directories, to /root/ is cp -r /etc/* /root. This command uses the cp command, which stands for copy, and is used to copy files and directories on Linux and Unix systems. The command also uses the following options and arguments123:
The -r option, which stands for recursive, and tells cp to copy all files and sub-directories of the source directory. Alternatively, the -R option can be used, which has the same effect as -r.
The /etc/* argument, which specifies the source directory and all its contents. The asterisk (*) is a wildcard character that matches any file or directory name. This argument tells cp to copy everything inside the /etc/ directory, but not the directory itself.
The /root argument, which specifies the destination directory. This argument tells cp to copy the source files and sub-directories to the /root/ directory.
The other options are incorrect because they use different commands or syntax that do not copy the contents of the directory /etc/, including all sub-directories, to /root/. For example:
Option A uses the copy command, which is not a valid Linux command. The correct command is cp.
Option C uses the -v option, which stands for verbose, and tells cp to print verbose output. This option does not affect the copying process, but only the output. It also does not include the -r or -R option, which is necessary to copy the sub-directories.
Option D uses the rcp command, which stands for remote copy, and is used to copy files between different hosts on a network. This command is not relevant for copying files on the same host.
Option E uses the -R option, which is correct, but also uses the . argument, which is incorrect. The dot (.) is a special character that matches any single character. This argument tells cp to copy only the files and directories that have a dot in their name, which may exclude some files and directories that do not have a dot.
52. Frage
What does the `~` symbol represent in a Linux shell?
Antwort: D
53. Frage
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