매달, 우리는 1000명 이상의 사람들이 시험 준비를 잘하고 시험을 잘 통과할 수 있도록 도와줍니다.
CompTIA Linux+ Certification Exam 온라인 연습
최종 업데이트 시간: 2026년02월14일
당신은 온라인 연습 문제를 통해 CompTIA XK0-006 시험지식에 대해 자신이 어떻게 알고 있는지 파악한 후 시험 참가 신청 여부를 결정할 수 있다.
시험을 100% 합격하고 시험 준비 시간을 35% 절약하기를 바라며 XK0-006 덤프 (최신 실제 시험 문제)를 사용 선택하여 현재 최신 54개의 시험 문제와 답을 포함하십시오.
정답:
Explanation:
User account information is centrally stored in the system’s account databases, and Linux+ V8 emphasizes the use of standard tools to query this data safely and consistently.
The getent passwd accounting command retrieves the user’s entry from the passwd database, which may be sourced from local files or network services such as LDAP. This entry includes the username, user ID (UID), group ID (GID), home directory, and assigned login shell. Therefore, option A provides all the requested information in a single command.
Option B, id accounting, displays the UID and group memberships but does not show the home directory or assigned shell.
Option C is incorrect because /etc/shadow contains password hashes and expiration data, not shell or home directory information.
Option D, who accounting, only shows login sessions and does not provide account configuration details.
Linux+ V8 documentation highlights getent passwd as the preferred method for retrieving comprehensive user account information because it works across different authentication backends.
Thus, the correct answer is A.
정답:
Explanation:
This scenario represents a classic CPU-bound performance issue, which is covered under the Troubleshooting domain of CompTIA Linux+ V8. The most important indicator is the load average compared to the number of available CPU cores.
The system has 4 CPU cores, as shown by nproc, but the load averages are consistently above 5, with a peak of 7.75. Load average reflects the number of processes either actively running on the CPU or waiting for CPU time. When the load average exceeds the number of CPU cores for extended periods, it indicates CPU contention. Processes must wait longer to be scheduled, resulting in delayed task completion.
The memory statistics confirm that memory is not the bottleneck. free -h shows over 3.5 GiB of available memory, and swap usage is minimal. Additionally, vmstat shows no significant swap-in or swap-out activity and low I/O wait, ruling out memory pressure and disk bottlenecks.
Increasing swap space would not help because the system is not memory constrained. Adding more disks would not address CPU scheduling delays. Increasing free memory is unnecessary because sufficient memory is already available.
Linux+ V8 documentation emphasizes correlating load average with CPU core count to diagnose CPU saturation. The most effective way to speed up job execution in this case is to increase CPU resources, such as adding more vCPUs, moving the workload to a more powerful system, or distributing the workload across multiple systems.
Therefore, the correct answer is B. Increase the amount of CPU resources available to the system.
정답:
Explanation:
Linux+ V8 emphasizes security, compliance, and governance when introducing new automation technologies, including AI. Before using AI tools to optimize commercial source code, the developer must ensure that such usage complies with organizational policies.
Option B is correct because verifying company policy is the first and most critical step. AI tools may introduce risks such as intellectual property leakage, licensing conflicts, or regulatory violations. Many organizations restrict how source code can be shared with external systems, including AI services.
The other options are premature. Selecting tools or deploying models should only occur after policy approval.
Linux+ V8 highlights governance-first approaches when adopting automation technologies.
Therefore, the correct answer is B.
정답:
Explanation:
Network configuration changes can cause immediate loss of connectivity if applied incorrectly. Linux+ V8 emphasizes safe configuration practices, particularly when managing remote systems.
The netplan try command applies network configuration changes temporarily and prompts the administrator to confirm them within a timeout period. If the administrator does not confirm, Netplan automatically rolls back to the previous working configuration. This prevents accidental outages caused by misconfigured network settings.
The netplan apply command makes changes permanent immediately and does not provide rollback protection.
The other options are not valid Netplan commands.
Linux+ V8 documentation explicitly references netplan try as a safe testing mechanism. Therefore, the correct answer is A.
정답:
Explanation:
From Linux+ V8 documents:
Consolidating system events from multiple sources into a single, centralized location is a key concept in Linux system administration and is explicitly covered under logging and monitoring topics in the CompTIA Linux+ V8 objectives. This method is known as log aggregation, making option A the correct answer.
Log aggregation refers to the practice of collecting logs generated by operating systems, services, applications, and network devices and storing them in a centralized repository. In Linux environments, logs may originate from systemd-journald, syslog, application-specific log files, containers, and cloud-based workloads. Aggregating these logs allows administrators to analyze events more efficiently, correlate issues across systems, and improve troubleshooting, auditing, and security monitoring.
Linux+ V8 documentation emphasizes centralized logging as a best practice in environments with multiple servers. Without log aggregation, administrators would need to log in to each system individually to inspect logs, which is inefficient and error-prone. Centralized solutions such as syslog servers, ELK/EFK stacks, and SIEM platforms enable real-time analysis, long-term retention, and alerting based on log data.
The other options do not describe log consolidation. Health checks are used to verify whether services or systems are operational but do not collect or store event data. Webhooks are HTTP-based callbacks used for event-driven automation and notifications, not for storing logs. Threshold monitoring involves generating alerts when metrics exceed defined limits, such as CPU or memory usage, but it does not centralize system event records.
Linux+ V8 stresses that effective log aggregation improves incident response, supports compliance requirements, and enhances system visibility. It is especially important for detecting security incidents, diagnosing failures, and performing root-cause analysis across distributed systems.
정답:
Explanation:
Version control rollback operations are a core DevOps skill covered in the Linux+ V8 objectives. When changes in a local Git repository break an application and must be reverted, the administrator must choose a command that directly undoes those changes.
The command git reset is the most appropriate option in this scenario. It allows the engineer to move the current branch pointer (HEAD) to a previous commit, effectively discarding or undoing local changes. Depending on the reset mode (--soft, --mixed, or --hard), the engineer can control whether changes are preserved in the staging area or working directory. This flexibility makes git reset the primary tool for reverting problematic local changes.
The other options are not suitable. git pull fetches and merges changes from a remote repository and does not revert local modifications. git rebase rewrites commit history and is used to reapply commits on top of another base, not to undo broken changes. git stash temporarily saves uncommitted changes for later use but does not revert the repository to a stable state.
Linux+ V8 documentation emphasizes that git reset is commonly used during local development when changes need to be undone quickly before being shared with others. Therefore, the correct answer is B.
정답:
Explanation:
This scenario involves shared directory collaboration, which is a common system management task covered in the CompTIA Linux+ V8 objectives. The key issue is that users can create files in the shared directory, but other users in the same group cannot modify those files. This behavior is directly related to group ownership inheritance.
By default, when a user creates a file or directory, it is owned by the user and assigned the user’s primary group, not necessarily the group of the parent directory. As shown in the output, files inside /share are owned by different groups (student, student2, student3), which prevents other group members from modifying them, even though the parent directory is group-writable.
The correct solution is to set the setgid (set group ID) bit on the shared directory, making option D correct. When the setgid bit is applied to a directory, all newly created files and subdirectories inherit the group ownership of the parent directory, rather than the creator’s primary group. This ensures consistent group ownership and allows all members of the shared group to collaborate effectively.
The other options are incorrect or poor practice.
Option A (setuid) is intended for executables, not directories.
Option B requires constant manual intervention and does not scale.
Option C weakens security by granting write access to all users, violating the principle of least privilege.
Linux+ V8 documentation explicitly recommends using the setgid bit on shared directories to manage collaborative access securely and efficiently.
정답:
Explanation:
File and directory management is a core system administration skill addressed in Linux+ V8. When an administrator needs to delete a directory that contains files or subdirectories, a recursive deletion is required.
The correct command is rm -r /home/user1/data. The rm command removes files, and the -r (recursive) option allows it to delete directories and all of their contents, including nested files and subdirectories. This is the standard and correct method for removing non-empty directories.
The other options are incorrect. rmdir -p only removes empty directories and will fail if the directory contains files. ln -d is used to create directory hard links, not remove directories. cut -d is a text-processing command unrelated to filesystem operations.
Linux+ V8 documentation stresses caution when using rm -r, as it permanently deletes data without recovery unless backups exist. Therefore, the correct answer is C.
정답:
Explanation:
User and group management is a core System Management topic in CompTIA Linux+ V8. When adding a user to an additional group―such as the docker group―care must be taken not to alter the user’s primary group.
The correct command is sudo usermod -aG docker user. The -G option specifies a supplementary group, and the -a (append) option ensures the user is added to the group without removing existing group memberships. This is especially important because omitting -a would overwrite the user’s supplementary groups.
Option B, usermod -g docker user, changes the user’s primary group, which is not desired. Options A and D misuse groupmod, which is intended for modifying group properties, not user membership.
Linux+ V8 documentation explicitly warns that failing to use -a with -G can unintentionally remove a user from all other supplementary groups, potentially causing access issues.
Therefore, the correct and safe command is C. sudo usermod -aG docker user.
정답:
Explanation:
From Exact Extract:
During SSH public key authentication, the server checks if the user's public key is present in the ~/.ssh /authorized_keys file. If the key is found, the server uses it to verify the user's identity by sending a challenge that can only be answered by the corresponding private key. This process does not involve password hashing or using the public key directly for encryption of the communication stream. Instead, the public key is simply used as a reference for authentication.
Reference: CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: "Securing Linux", Section: "SSH Key-Based Authentication"
CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security
정답:
Explanation:
Container orchestration concepts are part of the Automation and Orchestration domain in Linux+ V8. In Kubernetes, workloads run inside Pods, but Pods are not directly accessible from outside the cluster.
To expose an application externally, a Service resource must be created. Services provide a stable network endpoint and can be configured as NodePort, LoadBalancer, or ClusterIP. Public exposure is typically achieved using NodePort or LoadBalancer types.
Option C, Service, is correct. Deployments manage Pods, but they do not handle networking exposure. Pods represent running containers but lack external accessibility by default. “Network” is not a valid Kubernetes resource type.
Linux+ V8 documentation highlights Services as the mechanism for exposing containerized applications.
Therefore, the correct answer is C.
정답:
Explanation:
The initrd (initial RAM disk) plays a critical role in the Linux boot process, a topic covered under system management in Linux+ V8. Initrd is a temporary root filesystem loaded into memory by the bootloader before the main root filesystem is mounted.
Its primary purpose is to provide the kernel with the essential drivers, kernel modules, and utilities required to access the real root filesystem. This includes drivers for storage controllers, filesystems, RAID, LVM, or encrypted disks. Without initrd, the kernel may not be able to locate or mount the root filesystem, causing the boot process to fail.
Option B correctly describes this function. Initrd allows systems to boot flexibly across different hardware configurations by loading only the required modules at startup.
The other options are incorrect. Initrd is not related to SSH connectivity, which requires networking services that start much later in the boot process. It does not store trusted certificates or secret keys, which are typically located in persistent directories such as /etc/ssl. It is also unrelated to initializing random devices.
Linux+ V8 documentation emphasizes initrd (and its successor, initramfs) as a key component of the Linux boot sequence. Therefore, the correct answer is B.
정답:
Explanation:
From Exact Extract:
The ntpdate command synchronizes the system clock with a remote NTP server immediately, correcting any significant time drift. This is ideal for one-time corrections.
For example:
bash
CopyEdit
ntpdate pool.ntp.org
Other options:
A. hwclock reads or sets the hardware clock, but does not sync with network time.
C. timedatectl can set the time manually or manage time settings, but does not immediately sync with a remote NTP server.
D. ntpd -q can also sync the clock once, but ntpdate is designed specifically for immediate synchronization and is more straightforward for one-time corrections.
Reference: CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 5: "System Management", Section: "Time Synchronization"
CompTIA Linux+ XK0-006 Objectives, Domain 1.0: System Management
정답:
Explanation:
Firewall configuration is a key topic in the Security domain of CompTIA Linux+ V8. DNS primarily uses UDP port 53, but TCP port 53 is also required for zone transfers, large responses, and certain reliability scenarios. In this case, the administrator explicitly needs to allow DNS over TCP from a specific network.
The correct command is ufw allow 53/tcp from 10.0.0.0/24. This rule allows incoming TCP traffic on port 53 only from the specified subnet, following the principle of least privilege. Linux+ V8 documentation emphasizes restricting firewall rules by source network whenever possible to minimize attack surfaces.
Option A is incorrect because UFW service aliases like dns are not always guaranteed to map explicitly to TCP, and the syntax is incomplete.
Option B is invalid because ufw enable is used to enable the firewall globally and does not define rules.
Option D disables firewall protections and introduces a major security risk.
Linux+ V8 best practices stress precise, minimal firewall rules instead of broad or disabling actions.
Therefore, C is the correct and secure choice.
정답:
Explanation:
This scenario represents a name resolution failure, which is a common troubleshooting case addressed in CompTIA Linux+ V8. The critical clues are the error messages returned by both curl and dig.
The curl error “Could not resolve host” indicates that the system is unable to translate the hostname into an IP address. This is confirmed by the dig output, which returns NXDOMAIN, meaning the DNS resolver cannot resolve the requested domain name. Importantly, the dig output shows that the query is reaching a DNS server (10.255.255.254), but the resolution fails, strongly pointing to a DNS client configuration issue.
Option C, reviewing and fixing the DNS client configuration file (such as /etc/resolv.conf or systemd-resolved settings), is the correct action. Linux+ V8 documentation highlights DNS misconfiguration as a primary cause of application connectivity issues. Incorrect nameserver entries, unreachable DNS servers, or misconfigured resolvers commonly produce NXDOMAIN responses.
The other options are incorrect. Firewall issues would result in connection timeouts, not DNS resolution failures. Requesting a new API endpoint is unnecessary without first confirming local DNS functionality. Internet connectivity issues would typically prevent any DNS communication, but here a DNS server is clearly being contacted.
Linux+ V8 stresses a layered troubleshooting approach: verify DNS resolution before investigating network ports or application logic. Therefore, the correct answer is C. Review and fix the DNS client configuration file.