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CompTIA Linux+ certification is ideal for IT professionals who work in organizations that rely heavily on Linux operating systems. CompTIA Linux+ Certification Exam certification is particularly suitable for system administrators, network administrators, and IT professionals who are responsible for maintaining Linux servers, workstations, and devices. CompTIA Linux+ Certification Exam certification helps candidates to demonstrate their skills and knowledge in Linux systems and gives them a competitive advantage in the job market.
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CompTIA XK0-005 exam covers a wide range of Linux-related topics, including system architecture, installation and package management, GNU and Unix commands, devices, and file systems. It also covers topics such as security, networking, and shell scripting. XK0-005 exam is performance-based, which means that test takers must demonstrate their ability to complete tasks related to Linux system administration, rather than just answering multiple-choice questions.
CompTIA Linux+ Certification Exam Sample Questions (Q74-Q79):NEW QUESTION # 74 Users report that connections to a MariaDB service are being closed unexpectedly. A systems administrator troubleshoots the issue and finds the following message in /var/log/messages:
Which of the following is causing the connection issue?
* A. Something is starving the server resources.
* B. The server is running out of file descriptors.
* C. The amount of RAM allocated to the server is too high.
* D. The process mysqld is using too many semaphores.
Answer: BExplanation:
Explanation
The message in /var/log/messages indicates that the server is running out of file descriptors. A file descriptor is a non-negative integer identifier for an open file in Linux. Each process has a table of open file descriptors where a new entry is appended upon opening a new file. There is a limit on how many file descriptors a process can open at a time, which depends on the system configuration and the user privileges. If a process tries to open more files than the limit, it will fail with an error message like "Too many open files". This could cause connections to be closed unexpectedly or other problems with the application.
The other options are not correct causes for the connection issue. The process mysqld is not using too many semaphores, which are synchronization mechanisms for processes that share resources. Semaphores are not related to file descriptors or open files. Something is not starving the server resources, which could mean high CPU usage, memory pressure, disk I/O, network congestion, or other factors that affect performance. These could cause slowdowns or timeouts, but not file descriptor exhaustion. The amount of RAM allocated to the server is not too high, which could cause swapping or paging if it exceeds the physical memory available. This could also affect performance, but not file descriptor availability. References: File Descriptor Requirements (Linux Systems); Limits on the Number of Linux File Descriptors
NEW QUESTION # 75 A systems administrator is encountering performance issues. The administrator runs 3 commands with the following output
The Linux server has the following system properties
CPU: 4 vCPU
Memory: 50GB
Which of the following accurately describes this situation?
* A. The system is under CPU pressure and will require additional vCPUs
* B. Too many users are currently logged in to the system
* C. The system requires more memory
* D. The system has been running for over a year and requires a reboot.
Answer: DNEW QUESTION # 76 After connecting to a remote host via SSH, an administrator attempts to run an application but receives the following error:
[user@workstation ~]$ ssh admin@srv1
Last login: Tue Mar 29 18:03:34 2022
[admin@srvl ~] $ /usr/local/bin/config_manager
Error: cannot open display:
[admin@srv1 ~] $
Which of the following should the administrator do to resolve this error?
* A. Open port 6000 on the workstation and restart the firewalld service.
* B. Enable X11 forwarding in /etc/ssh/ssh_config and restart the server.
* C. Disconnect from the SSH session and reconnect using the ssh -x command.
* D. Add Options X11 to the /home/admin/.ssh/authorized_keys file.
Answer: CExplanation:
Explanation
The error indicates that the application requires an X11 display, but the SSH session does not forward the X11 connection. To enable X11 forwarding, the administrator needs to use the ssh -X option, which requests X11 forwarding with authentication spoofing. This will set the DISPLAY environment variable on the remote host and allow the application to open a window on the local display.
References
CompTIA Linux+ (XK0-005) Certification Study Guide, page 314
Open a window on a remote X display (why "Cannot open display")?, answer by Gilles 'SO- stop being evil'
NEW QUESTION # 77 A Linux user is trying to execute commands with sudo but is receiving the following error:
$ sudo visudo
>>> /etc/sudoers: syntax error near line 28 <<<
sudo: parse error in /etc/sudoers near line 28
sudo: no valid sudoers sources found, quitting
The following output is provided:
# grep root /etc/shadow
root :* LOCK *: 14600 ::::::
Which of the following actions will resolve this issue?
* A. Comment out line 28 from /etc/sudoers and try to use sudo again.
* B. Log in to the system using the other regular user, switch to root, and comment out line 28 from /etc/sudoers.
* C. Boot the system in single user mode and comment out line 28 from /etc/sudoers.
* D. Log in directly using the root account and comment out line 28 from /etc/sudoers.
Answer: CNEW QUESTION # 78 A newly created container has been unable to start properly, and a Linux administrator is analyzing the cause of the failure. Which of the following will allow the administrator to determine the FIRST command that is executed inside the container right after it starts?
* A. docker info <container_id>
* B. docker start <container_id>
* C. docker export <container_id>
* D. docker inspect <container_id>
Answer: DExplanation:
Explanation
The command that will allow the administrator to determine the first command that is executed inside the container right after it starts is docker inspect <container_id>. This command will display detailed information about the container, including its configuration, state, network settings, mounts, and logs. One of the configuration fields is "Entrypoint", which shows the command that is executed when the container is run. The entrypoint can be specified in the Dockerfile or overridden at runtime using the --entrypoint option.
The other options are not correct commands for determining the first command that is executed inside the container. The docker export <container_id> command will export the contents of the container's filesystem as a tar archive to STDOUT. This will not show the entrypoint of the container, but only its files. The docker info <container_id> command is invalid because docker info does not take any arguments. It shows system-wide information about Docker, such as the number of containers, images, volumes, networks, and storage drivers. The docker start <container_id> command will start a stopped container and attach its STDOUT and STDERR to the terminal. This will not show the entrypoint of the container, but only its output. References: docker inspect | Docker Docs; docker export | Docker Docs; docker info | Docker Docs; docker start | Docker Docs
NEW QUESTION # 79......
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