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NEW QUESTION # 164
A systems administrator is writing a script to analyze the number of files in the directory
/opt/application/home/. Which of the following commands should the administrator use in conjunction with ls -l | to count the files?
Answer: D
Explanation:
wc -l counts the number of lines of input provided to it, which is commonly used to count the number of files when used with ls -l (excluding the header line). For example, ls -l
/opt/application/home/ | wc -l gives the total count of lines, which corresponds to the number of files and directories (including the total line at the top).
NEW QUESTION # 165
Which of the following commands is used to verify whether a port is open on a remote host?
Answer: A
Explanation:
The correct answer is C. nc because netcat (nc) is specifically designed to test network connectivity, including verifying whether a particular port is open on a remote host. It is a versatile networking tool commonly used in troubleshooting and diagnostics.
Using a command such as nc -zv < hostname > < port > , an administrator can attempt to establish a connection to a remote port. The -z option tells netcat to scan for listening daemons without sending data, and the -v option enables verbose output, indicating whether the connection was successful or refused. This makes nc one of the most efficient tools for quickly validating port accessibility.
Option A (ip) is incorrect because the ip command is used for network interface configuration and routing, not for testing remote port connectivity.
Option B (ping) is incorrect because it tests basic network reachability using ICMP packets, but it does not verify whether specific TCP/UDP ports are open.
Option D (netstat) is incorrect because it displays network connections and listening ports on the local machine, not remote hosts.
From a Linux+ troubleshooting standpoint, identifying whether a service is reachable on a specific port is essential for diagnosing connectivity issues. Tools like nc, telnet, and nmap are commonly used for this purpose, but nc is preferred due to its simplicity and flexibility. It helps determine whether issues stem from firewall rules, service availability, or network path problems, making it a critical command in a system administrator's toolkit.
NEW QUESTION # 166
Due to application compatibility issues, the Python 3 OpenSSL library should not be upgraded.
Which of the following commands should the systems administrator use to ensure the package stays at the current version?
Answer: C
Explanation:
This command places the specified package on hold, preventing it from being upgraded during system updates while allowing other packages to be updated normally.
NEW QUESTION # 167
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-killer
mysqld cpuset=/ mems_allowed=0
Which of the following explains why the server was offline?
Answer: C
Explanation:
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.
NEW QUESTION # 168
A Linux user needs to authenticate to a Windows Active Directory domain. Which of the following configuration files contains the domain configuration details?
Answer: C
Explanation:
The sssd.conf file contains the configuration for System Security Services Daemon, including Active Directory domain details used for authenticating Linux users against a Windows Active Directory domain.
NEW QUESTION # 169
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