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NEW QUESTION # 56
A Linux server is experiencing slowness. A systems administrator obtains the following output:
top - load average: 2.43, 1.80, 2.32
Tasks: ... 154 zombie
%Cpu(s): 6.2 us, 5.1 sy, 0.0 ni, 79.2 id, 9.1 wa, ...
$ iostat -m 2
%user %nice %system %iowait %steal %idle
4.30 2.02 0.29 70.38 4.00 19.01
Which of the following explains the issue?
Answer: A
Explanation:
Performance troubleshooting in CompTIA Linux+ V8 requires the ability to correlate metrics from tools like top, vmstat, and iostat. In this case, the iostat output provides the most critical data point: %iowait is at
70.38%.
The %iowait metric (also shown as wa in top) represents the percentage of time that the CPU was idle while there were outstanding disk I/O requests. Essentially, the CPU is waiting for the storage subsystem (hard drives or SSDs) to complete read or write operations. A value as high as 70% indicates a severe bottleneck in the storage layer. This " I/O wait " causes the system to feel sluggish or unresponsive because processes are stuck in an uninterruptible sleep state while waiting for data from the disk.
The top output also shows that the overall CPU is 79.2% idle, which confirms that the problem is NOT a lack of computational power (overutilization), making Option B incorrect. The system has 154 zombie processes, which might indicate poorly written software, but zombies themselves do not consume resources or cause slowness. There is no evidence of swap exhaustion (Option A) or a need for patching (Option D) provided in the statistics.
According to Linux+ V8 best practices, when high I/O wait is detected, administrators should investigate disk health, controller performance, or application-level disk usage (e.g., a database performing heavy indexing).
Therefore, high storage I/O latency is the verified explanation for the server slowness.
NEW QUESTION # 57
A Linux user needs to authenticate to a Windows Active Directory domain. Which of the following configuration files contains the domain configuration details?
Answer: B
Explanation:
In modern Linux enterprise environments, integrating with Windows Active Directory (AD) is a common requirement for centralized identity management. According to CompTIA Linux+ V8, the System Security Services Daemon (SSSD) is the recommended way to handle authentication and authorization against remote providers like AD or LDAP.
The sssd.conf file (typically located in /etc/sssd/) is the primary configuration file for this service. It contains the essential " domain configuration details, " including:
* The AD domain name.
* The authentication provider (e.g., id_provider = ad).
* The URI of the domain controllers.
* Caching settings for offline login.
SSSD provides a unified interface that manages the communication between the Linux system and the AD domain, simplifying the authentication stack.
The other options are related but do not serve as the primary domain configuration file. krb5.conf (Option B) configures Kerberos, which is used for the underlying ticket-based authentication, but SSSD often manages these details automatically or relies on it as a sub-component. pam.conf (Option C) manages the Pluggable Authentication Modules stack but does not store domain-specific details.
smb.conf (Option D) is the configuration for Samba; while Samba is used for file sharing and can assist in joining a domain, sssd.conf is the verified location for modern identity integration details in Linux+ V8 environments.
NEW QUESTION # 58
The security manager at a company notifies a systems administrator of open vulnerabilities on the Linux system. The administrator receives the following information while logged in to the server:
$ date
Thu Jul 11 16:12:42 UTC 2024
$ getenforce
Enforcing
$ dnf history
ID | Command Line | Date and time | Action(s) | Altered
45 | update -y | 2023-07-09 | Update | 27
46 | install httpd | 2023-01-11 | Install | 9
47 | update -y | 2023-08-08 | Upgrade | 44
Which of the following is the most likely security concern?
Answer: D
Explanation:
Maintaining system security requires regular patching and updates to mitigate vulnerabilities. In this scenario, the administrator is presented with the current system date (July 11, 2024) and a history of package management transactions via the dnf history command. The last recorded update transaction (ID 47) occurred on August 8, 2023. This indicates that the system has gone nearly a full year without receiving security patches or software updates.
According to CompTIA Linux+ V8 security best practices, " unpatched systems " represent one of the most significant risks to an organization ' s infrastructure. New vulnerabilities (CVEs) are discovered constantly, and vendors release patches to address these flaws. A system that has not been updated in a year is likely susceptible to numerous exploits that have been patched in more recent software versions. Therefore, the primary security concern is the lack of recent updates.
The other options are not valid security concerns in this context. While httpd (Apache) may have vulnerabilities if unpatched, its mere presence (Option B) is not inherently a security concern if the service is required for business operations. Option C refers to the time zone configuration (UTC vs. EDT), which has no impact on system security. Option D suggests disabling SELinux; however, SELinux in " Enforcing " mode is actually a security best practice that provides Mandatory Access Control (MAC) to protect the system.
Disabling it would weaken the system ' s security posture rather than improve it.
The verified answer is that the server requires immediate patching due to the elapsed time since its last update.
NEW QUESTION # 59
A Linux administrator is configuring a CUPS print service on a Linux machine and needs to allow only connections from a local network. Which of the following commands should the administrator use?
Answer: B
Explanation:
Allowing access to the CUPS service requires permitting incoming TCP connections to port 631 from the local network. Adding an INPUT rule with the source network and destination port 631 ensures only hosts on that subnet can connect to the print service.
NEW QUESTION # 60
Users connecting to a MySQL database on a Linux system report frequent errors. An administrator reviews the following partial output of the /proc/meminfo and freecommands:
Which of the following should the administrator do to ensure that the MySQL service will continue to run even if the system runs out of swap space? (Choose two.)
Answer: C,D
Explanation:
Creating a swap file with dd if=/dev/zero of=/swapfile bs=1024 count=65536 allocates additional swap space that MySQL can use when RAM is exhausted.
Formatting and enabling a swap partition with mkswap /dev/sda2; swapon -v /dev/sda2 brings another swap device online, further increasing the system's swap capacity.
NEW QUESTION # 61
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