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CompTIA Linux+ Certification Exam試験は大多数の受験者にとって難しい難題であることは広く受け入れられていますが、関連するXK0-006認定はこの分野の労働者にとって非常に重要であるため、多くの労働者はこの課題に取り組む必要があります。 幸いなことに、この種の質問について心配する必要はありません。このWebサイトJpshikenで最適なソリューションを見つけることができるので、XK0-006トレーニング資料です。 テクノロジー、人材、施設への継続的な投資により、当社CompTIAの未来はこれまでになく輝かしく見えました。 優れたXK0-006試験問題により、XK0-006試験に合格します。
質問 # 111
A Linux administrator prepares a backup script named testBack.sh. The backup script must be executed at 3:00 p.m. every Sunday. Which of the following crontabconfigurations will satisfy this requirement?
正解：C
解説：
This cron entry schedules the script to run at minute zero of hour fifteen every Sunday, which corresponds to 3:00 p.m. each week.
質問 # 112
A Linux administrator receives reports about MySQL service availability issues. The administrator observes the following information:
* uptime -p shows the system has been up for only 2 minutes
* journalctl shows messages indicating:mysqld invoked oom-killermysqld cpuset=/ mems_allowed=0 Which of the following explains why the server was offline?
正解：C
解説：
This scenario clearly indicates a memory exhaustion condition, which falls under the Troubleshooting domain of the CompTIA Linux+ V8 objectives. The most critical clue is the log entry stating that mysqld invoked oom-killer.
The OOM (Out-Of-Memory) killer is a Linux kernel mechanism that activates when the system runs critically low on available memory and cannot satisfy memory allocation requests. When this happens, the kernel selects a process-typically one consuming a large amount of memory-and forcibly terminates it to protect overall system stability. In this case, the MySQL daemon (mysqld) was identified as the process responsible for triggering the OOM condition.
The journalctl output explicitly confirms this behavior. Linux+ V8 documentation emphasizes that when the OOM killer is invoked, it is almost always due to physical memory exhaustion or insufficient swap space, not user intervention or application bugs alone. The additional log line showing mems_allowed=0 further supports the conclusion that the process could not allocate memory from available memory nodes.
The fact that uptime -p reports only 2 minutes of uptime strongly suggests that the system was either rebooted automatically or manually following the memory exhaustion event. Systems may reboot as part of recovery procedures after severe resource exhaustion, especially in production environments.
The other options can be ruled out. There is no indication of a user-initiated kill signal, filesystem corruption, or network connectivity issues. Network outages would not generate OOM killer messages, and filesystem errors would appear as I/O or disk-related errors in the logs.
Linux+ V8 best practices recommend addressing OOM issues by increasing system memory, tuning MySQL memory parameters, configuring swap space, or adjusting OOM scoring.
Therefore, the correct explanation is A. The process exhausted server memory.
質問 # 113
While hardening a system, an administrator runs a port scan with Nmap, which returned the following output:
Which of the following is the best way to address this security issue?
正解：B
解説：
This scenario falls under the Security domain of the CompTIA Linux+ V8 objectives and focuses on system hardening and service minimization. The Nmap scan output reveals that port 23 (Telnet) is open on the system, which represents a significant security risk.
Telnet is an insecure, legacy protocol that transmits authentication credentials and session data in plaintext, making it vulnerable to interception through packet sniffing or man-in-the-middle attacks. Linux+ V8 documentation explicitly emphasizes the principle of least functionality, which states that unnecessary or insecure services should be disabled and removed entirely rather than merely restricted.
Option D, disabling and removing the Telnet service on the server, is the best and most secure solution. This action eliminates the vulnerable service completely, ensuring that it cannot be exploited internally or externally. In secure Linux environments, Telnet should be replaced with SSH, which provides encrypted communication and strong authentication mechanisms.
Option A, blocking port 23 with a firewall, reduces exposure but does not eliminate the underlying risk. If the firewall rules are misconfigured or bypassed, the Telnet service would still be available. Linux+ V8 best practices recommend removing insecure services rather than relying solely on perimeter controls.
Option B is unrelated, as changing passwords does not address the risk of plaintext credential transmission.
Option C is incorrect because closing ports at the network switch level is not an appropriate or scalable solution for host-level service hardening and does not address internal access risks.
Linux+ V8 documentation consistently highlights service auditing, port scanning, and removal of insecure protocols as essential system hardening steps. Therefore, the most effective and secure remediation is to disable and remove the Telnet service.
質問 # 114
Which of the following commands should a Linux administrator use to determine the version of a kernel module?
正解：C
解説：
Kernel module management is an important part of Linux system administration and is covered in the Linux+ V8 objectives. When an administrator needs to determine metadata about a kernel module-such as its version, author, description, license, filename, and dependencies-the correct tool is modinfo.
The command modinfo bluetooth displays detailed information about the specified kernel module, including the module version if it is defined. This makes it the correct and intended command for retrieving version details of kernel modules, whether or not the module is currently loaded.
The other options are incorrect. modprobe bluetooth is used to load or unload kernel modules and does not display version information. lsmod lists loaded modules but does not show version details and does not accept module names as arguments in that manner. depmod is used to generate module dependency information and does not provide module metadata to the administrator.
Linux+ V8 documentation specifically references modinfo as the utility for inspecting kernel module properties. This command is essential for troubleshooting driver issues, verifying compatibility, and auditing kernel components.
Therefore, the correct answer is D. modinfo bluetooth.
質問 # 115
A systems administrator is having issues with a third-party API endpoint. The administrator receives the following output:
Which of the following actions should the administrator take to resolve the issue?
正解：A
解説：
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.
質問 # 116
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