Free Linux+ XK0-006 Ultimate Study Guide (Updated 92 Questions)
Get to the Top with XK0-006 Practice Exam Questions
NEW QUESTION # 55
Which of the following most accurately describes a webhook?
- A. An authentication method for web-server communication
- B. An HTTP-based callback function
- C. A means to transmit sensitive information between systems
- D. An SNMP-based API for network device monitoring
Answer: B
Explanation:
A webhook is an HTTP-based callback that allows one system to send real-time data or notifications to another system when an event occurs.
NEW QUESTION # 56
Which of the following commands should a Linux administrator use to determine the version of a kernel module?
- A. depmod bluetooth
- B. modinfo bluetooth
- C. modprobe bluetooth
- D. lsmod bluetooth
Answer: B
Explanation:
The modinfo command displays detailed information about a kernel module, including its version, author, description, and parameters.
NEW QUESTION # 57
A systems administrator wants to check if the ntpd service is configured to start on startup. Which of the following commands will show that information when run?
- A. systemctl stop ntpd.service
- B. systemctl is-active ntpd.service
- C. systemctl start ntpd.service
- D. systemctl is-enabled ntpd.service
Answer: D
NEW QUESTION # 58
A systems administrator wants to review the amount of time the NetworkManagerservice took to start. Which of the following commands accomplishes this goal?
- A. resolvectl
- B. systemd-analyze blame
- C. systemctl daemon-reload
- D. journalctl
Answer: B
Explanation:
The systemd-analyze blame command shows the startup time of each service managed by systemd, allowing the administrator to see how long NetworkManager (or any other service) took to start.
NEW QUESTION # 59
Following the completion of monthly server patching, a Linux administrator receives reports that a critical application is not functioning. Which of the following commands should help the administrator determine which packages were installed?
- A. dnf info
- B. dnf list
- C. dnf history
- D. dnf search
Answer: C
Explanation:
The dnf history command shows a log of past package operations (install, update, remove), allowing the administrator to review which packages were installed or updated during the patching process.
NEW QUESTION # 60
Which of the following cryptographic functions ensures a hard drive is encrypted when not in use?
- A. PKI certificates
- B. LUKS
- C. GPG
- D. OpenSSL
Answer: B
Explanation:
LUKS (Linux Unified Key Setup) provides full-disk encryption, ensuring that the data on a hard drive is protected and unreadable when the system is powered off or the drive is not in use.
NEW QUESTION # 61
A Linux administrator receives reports that an application hosted in a system is not completing tasks in the allocated time. The administrator connects to the system and obtains the following details:
Which of the following actions can the administrator take to help speed up the jobs?
- A. Increase the amount of CPU resources available to the system.
- B. Increase the amount of disks available to the system.
- C. Increase the amount of free memory available to the system.
- D. Increase the amount of swap space available to the system.
Answer: A
Explanation:
The uptime output shows a load average of 7.75, 5.72, 5.17 on a system with only 4 processors (nproc = 4). This indicates CPU saturation since the load averages are significantly higher than the number of available CPUs. Memory and swap usage are minimal, and vmstat shows no I/O waits, so the bottleneck is CPU. Increasing CPU resources will help speed up the jobs.
NEW QUESTION # 62
An administrator needs to remove the directory /home/user1/dataand all of its contents.
Which of the following commands should the administrator use?
- A. ln -d /home/user1/data
- B. cut -d /home/user1/data
- C. rmdir -p /home/user1/data
- D. rm -r /home/user1/data
Answer: D
Explanation:
The rm -r command recursively removes a directory and all of its contents (files and subdirectories), which is required for deleting /home/user1/data.
NEW QUESTION # 63
A systems administrator needs to enable routing of IP packets between network interfaces.
Which of the following kernel parameters should the administrator change?
- A. net.ipv4.ip_local_port_range
- B. net.ipv4.ip_forward
- C. net.ipv4.ip_multicast
- D. net.ipv4.ip_route
Answer: B
Explanation:
The net.ipv4.ip_forward kernel parameter controls whether the Linux kernel can forward IP packets between network interfaces, enabling routing functionality when set to 1.
NEW QUESTION # 64
A Linux administrator wants to add a user to the Docker group without changing their primary group. Which of the following commands should the administrator use to complete this task?
- A. sudo usermod -g docker user
- B. sudo groupmod docker user
- C. sudo groupmod -G docker user
- D. sudo usermod -aG docker user
Answer: D
Explanation:
The usermod -aG command appends (-a) the user to a supplementary group (-G) without changing their primary group. This is the correct way to add a user to the docker group.
NEW QUESTION # 65
Which of the following Ansible components contains a list of hosts and host groups?
- A. Collection
- B. Playbook
- C. Inventory
- D. Fact
Answer: C
Explanation:
In Ansible, the inventory defines the list of managed nodes (hosts) and groups of hosts. It is the source from which Ansible knows what systems to configure or manage.
NEW QUESTION # 66
A systems administrator manages multiple Linux servers and needs to set up a reliable and secure way to handle the complexity of managing event records on the OS and application levels.
Which of the following should the administrator do?
- A. Deploy log rotation procedures to manage the records.
- B. Implement a centralized log aggregation solution.
- C. Create an automated process to retrieve logs from the server by demand.
- D. Configure daily automatic backups of logs to remote storage.
Answer: B
Explanation:
A centralized log aggregation solution (such as Elasticsearch, Graylog, or Splunk) provides reliable and secure management of logs across multiple servers. It consolidates OS and application logs, simplifies analysis, and improves monitoring and security compared to on- demand retrieval, backups, or simple log rotation.
NEW QUESTION # 67
In the echo "profile-$num-$name"line of a shell script, the variable $numseems to not be expanding during execution. Which of the following notations ensures the value is expanded?
- A. echo "profile-$(num)-$name"
- B. echo 'profile-$num-$name'
- C. echo "profile-'Snum'-$name"
- D. echo "profile-${num}-$name"
Answer: D
Explanation:
Using ${num} ensures correct variable expansion, especially when variables are adjacent to other characters or hyphens. This prevents ambiguity and guarantees $num is properly expanded within the string.
NEW QUESTION # 68
A user on a Linux VM is running /work/test.shBash script and receives the following error:
bash: /work/test.sh: Permission denied
After further investigation, the user receives the following outputs:
Which of the following commands should a systems administrator run to fix the issue?
- A. chmod g+x /work/test.sh
- B. chmod o+x /work/test.sh
- C. mount -o remount,suid /work
- D. mount -o remount,exec /work
Answer: D
Explanation:
The script /work/test.sh already has execute permissions (-rwxr--r--), but the filesystem is mounted with the noexec option, which prevents execution of binaries and scripts. Remounting the filesystem with the exec option allows execution of the script.
NEW QUESTION # 69
Which of the following best describes JSON?
- A. A software-based technique that allows a computer to simulate one or more machines so they appear to be real
- B. An open-source platform that facilitates the creation and administration of isolated environments
- C. A programming language that developers use to build dynamic websites
- D. A file format for exchanging information or data between systems
Answer: D
Explanation:
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. JSON is commonly used to transmit data between a server and a client, as it is language-independent and can be used in many environments.
NEW QUESTION # 70
A Linux systems administrator is resolving a privileged access issue for users who are members of an admin group. Which of the following configuration files should the administrator update so the users in the admin group will have root privileged access to the Linux system?
- A. /etc/sudoers
- B. /etc/group
- C. /etc/shadow
- D. /etc/login.defs
Answer: A
Explanation:
The /etc/sudoersfile controls which users and groups can elevate privileges via sudo. By adding a line such as %admin ALL=(ALL) ALLto /etc/sudoers, members of the admin group gain root-level access.
NEW QUESTION # 71
An average of one out of three users in a company cannot reach the company website. A Linux administrator determines that one of the three website servers is down. The administrator inspects the DNS configuration for the website and notices the following entry:
Which of the following accurately explains the issue?
- A. The DNS configuration is missing corresponding AAAA records and PTR records, and this is causing clients to fail the hostname translation.
- B. The administrator has incorrectly configured the DNS server to be an iterative resolver instead of an authoritative resolver.
- C. One of the DNS records has not been signed with a DNSSEC-supported key, and this is causing some web browsers to reject the DNS response.
- D. DNS returns all three records in a different order each time, and the browser typically uses the first address in the DNS response.
Answer: D
Explanation:
With multiple A records, DNS performs simple round-robin ordering and returns the records in a different sequence on each query. Most clients try the first address returned-so when the downed server's IP appears first (about one in three times), those users cannot connect.
NEW QUESTION # 72
Which of the following describes the method of consolidating system events to a single location?
- A. Webhooks
- B. Health checks
- C. Threshold monitoring
- D. Log aggregation
Answer: D
Explanation:
Log aggregation is the process of collecting and consolidating logs from multiple sources into a single location, making it easier to analyze and manage system events.
NEW QUESTION # 73
To perform a live migration, which of the following must match on both host servers? (Choose two).
- A. USB ports
- B. Available memory
- C. Available swap
- D. CPU architecture
- E. Disk storage path
- F. Network speed
Answer: D,E
Explanation:
CPU architecture must match because live migration requires CPU compatibility to continue running the virtual machine without errors.
Disk storage path must match so the migrated VM can access its virtual disks seamlessly on the destination host.
NEW QUESTION # 74
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
[email protected]: Permission denied (publickey,password)
After seeing the message, the administrator attempts to connect using ssh -v [email protected] and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm
Which of the following actions should the administrator take first to remediate this issue?
- A. Create a new key pair by running ssh-keygen -t ecdsa.
- B. Issue systemctl restart sshd on the local server.
- C. Update permissions on the /home/admin/.ssh directory to 700 on the remote server.
- D. Set PermitRootLogin yes in the /etc/ssh/sshd_config file.
Answer: A
Explanation:
The "no mutual signature algorithm" error means the RSA/SHA-1 key type (ssh-rsa) isn't supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.
NEW QUESTION # 75
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