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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: The Linux Community and a Career in Open Source | 7% | - Open Source Applications
|
| Topic 2: The Power of the Command Line | 40% | - Pipes, Redirection and Variables
|
| Topic 3: Security and File Permissions | 13% | - Creating Users and Groups
|
| Topic 4: Finding Your Way on a Linux System | 20% | - Command Line Basics
|
| Topic 5: The Linux Operating System | 20% | - Understanding Computer Hardware
|
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NEW QUESTION # 72
What information is stored in/etc/passwd? (Choose three correct answers.)
Answer: A,B,E
Explanation:
Explanation
The /etc/passwd file is a plain text-based database that contains information for all user accounts on the system. It is owned by root and has 644 permissions. The file can only be modified by root or users with sudo privileges and readable by all system users. Each line of the /etc/passwd file contains seven comma-separated fields, representing a user account. The fields are as follows:
* Username: The string you type when you log into the system. Each username must be a unique string on the machine. The maximum length of the username is restricted to 32 characters.
* Password: In older Linux systems, the user's encrypted password was stored in the /etc/passwd file. On most modern systems, this field is set to x, and the user password is stored in the /etc/shadow file.
* User ID (UID): The user identifier is a number assigned to each user by the operating system to refer to a user. It is used by the kernel to check for the user privileges and grant access to system resources. The UID 0 is reserved for the root user and cannot be assigned to any other user.
* Group ID (GID): The user's group identifier number, referring to the user's primary group. When a user creates a file, the file's group is set to this group. Typically, the name of the group is the same as the name of the user. User's secondary groups are listed in the /etc/group file.
* User ID Info (GECOS): This is a comment field. This field contains a list of comma-separated values with the following information: User's full name or the application name, Room number, Work phone number, Home phone number, Other contact information.
* Home directory: The absolute path to the user's home directory. It contains the user's files and configurations. By default, the user home directories are named after the name of the user and created under the /home directory.
* Login shell: The absolute path to the user's login shell. This is the shell that is started when the user logs into the system. On most Linux distributions, the default login shell is Bash.
Therefore, the correct answers are B, C, and E. The user's storage space limit (A) is not stored in the
/etc/passwd file, but in the /etc/quota file. The encrypted password (D) is not stored in the /etc/passwd file, but in the /etc/shadow file. References:
* Linux Essentials Topic 104: The Linux Operating System, section 104.4: Runlevels and Boot Targets.
* Linux Essentials Topic 106: Security and File Permissions, section 106.1: Basic security and identifying user types.
* Linux Essentials Topic 106: Security and File Permissions, section 106.2: Creating users and groups.
* Understanding the /etc/passwd File | Linuxize
* Understanding the /etc/passwd File - GeeksforGeeks
* passwd(5) - Linux manual page - man7.org
* Understanding /etc/passwd file in Linux - DEV Community
NEW QUESTION # 73
What can be found in the /proc/ directory?
Answer: D
Explanation:
The /proc/ directory is a virtual file system that contains information about the system and the processes running on it. It is not a conventional file system that stores files on a disk, but rather a dynamic view of the kernel's data structures. One of the features of the /proc/ directory is that it contains one subdirectory for each process running on the system, which is named after the process ID (PID). For example, the subdirectory /proc/1/ contains information about the process with PID 1, which is usually the init process. The process subdirectories contain various files that provide information about the process, such as its status, memory usage, open files, environment variables, command line arguments, and more. The /proc/ directory also contains a symbolic link called 'self', which points to the process that is accessing the /proc/ file system. Therefore, the correct answer is D. One directory per running process.
The other options are incorrect because:
A . One directory per installed program. This is not true, as the /proc/ directory does not contain information about installed programs, but only about running processes. Installed programs are usually stored in other directories, such as /bin/, /usr/bin/, /opt/, etc.
B . One device file per hardware device. This is not true, as the /proc/ directory does not contain device files, but only virtual files that represent kernel data. Device files are usually stored in the /dev/ directory, which is another special file system that provides access to hardware devices.
C . One file per existing user account. This is not true, as the /proc/ directory does not contain information about user accounts, but only about processes. User accounts are usually stored in the /etc/ directory, which contains configuration files, such as /etc/passwd/ and /etc/shadow/, that define the users and their passwords.
E . One log file per running service. This is not true, as the /proc/ directory does not contain log files, but only information files. Log files are usually stored in the /var/log/ directory, which contains various files that record the activities of the system and the services.
Reference:
The /proc Filesystem - The Linux Kernel documentation
A Beginner's Guide to the /proc File System in Linux - Tecmint
Appendix E. The proc File System Red Hat Enterprise Linux 6 | Red Hat ...
Chapter 5. The proc File System Red Hat Enterprise Linux 4 | Red Hat ...
proc file system in Linux - GeeksforGeeks
NEW QUESTION # 74
Which of the following outputs could stem from the commandlast?
Answer: C
Explanation:
Explanation
The last command in Linux is used to display the list of all the users logged in and out since the file /var/log/wtmp was created1. The output of the last command shows the username, the terminal, the IP address, the login time and date, and the duration of the session for each record2. The option E is the only one that matches this format. Theother options are not related to the last command. Option A shows a list of commands executed by a user. Option B shows the password change information for a user. Option C shows the last login information for a user. Option D shows the mount information for a filesystem. References:
* Linux Essentials Version 1.6 Objectives3, Topic 1.4: Command Line Basics, Subtopic: Basic Shell Commands
* Linux last Command Tutorial for Beginners (8 Examples)4
* Linux Essentials Version 1.6 Exam Preparation Guide, Section 1.4: Command Line Basics, Page 16
NEW QUESTION # 75
Which of the following DNS record types hold an IP address? (Choose two.)
Answer: B,E
Explanation:
Explanation
The DNS record types that hold an IP address are the A and AAAA records. These records are used to map a domain name to an IP address of the host, which is necessary for establishing a connection between a client and a server. The A record holds a 32-bit IPv4 address, while the AAAA record holds a 128-bit IPv6 address.
For example, the A record for www.example.com could be:
www.example.com. IN A 192.0.2.1
This means that the domain name www.example.com resolves to the IPv4 address 192.0.2.1. Similarly, the AAAA record for www.example.com could be:
www.example.com. IN AAAA 2001:db8::1
This means that the domain name www.example.com resolves to the IPv6 address 2001:db8::1.
The other options are incorrect because:
* NS records are used to specify the authoritative name servers for a domain. They do not hold an IP address, but a domain name of the name server. For example, the NS record for example.com could be:
example.com. IN NS ns1.example.com.
This means that the name server ns1.example.com is authoritative for the domain example.com.
* MX records are used to specify the mail exchange servers for a domain. They do not hold an IP address, but a domain name of the mail server and a preference value. For example, the MX record for example.com could be:
example.com. IN MX 10 mail.example.com.
This means that the mail server mail.example.com has a preference value of 10 for receiving email for the domain example.com.
* CNAME records are used to create an alias for a domain name. They do not hold an IP address, but another domain name that the alias points to. For example, the CNAME record for www.example.com could be:
www.example.com. IN CNAME example.com.
This means that the domain name www.example.com is an alias for the domain name example.com.
References:
* DNS Record Types: Defined and Explained - Site24x7
* List of DNS record types - Wikipedia
NEW QUESTION # 76
A directory contains the following files:
What would be the output of the following shell script?
for file in *.txt
*.txt
Answer: D
NEW QUESTION # 77
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