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NEW QUESTION # 199
A Linux administrator needs to add a new HTTP service on the server. Which of the following commands allows other systems to communicate with the service after the system is restarted?
Answer: A
Explanation:
The correct answer is C. firewall-cmd --add-service=http --permanent because it ensures that the firewall rule allowing HTTP traffic remains in effect even after a system reboot. In Linux systems using firewalld, rules can be applied in two modes: runtime and permanent.
By default, when a rule is added using firewall-cmd --add-service=http (Option D), it is applied only to the runtime configuration. This means the rule will allow HTTP traffic immediately, but it will be lost once the system is restarted or the firewall service is reloaded.
The --permanent flag ensures that the rule is written to the persistent configuration files, so it survives reboots.
After adding a permanent rule, administrators typically run firewall-cmd --reload to apply the changes to the runtime environment as well.
Option A is incorrect because while it reloads the firewall, it does not specify the rule as permanent, so the configuration will not persist after reboot.
Option B is incorrect because --add-port=http is not valid syntax (ports must be specified numerically, e.g., 80
/tcp), and --complete-reload is not appropriate here.
Option D is incorrect because it only applies the rule temporarily (runtime only).
From a Linux+ security perspective, managing firewall rules persistently is essential for maintaining secure and consistent network access. Using the --permanent option ensures services like HTTP remain accessible across system restarts while still being controlled by firewall policies.
NEW QUESTION # 200
Which of the following can be implemented with PAM to detect and block dictionary attacks?
Answer: D
Explanation:
Pluggable Authentication Modules (PAM) provide a flexible, centralized mechanism for managing authentication across various services in a Linux system. According to the CompTIA Linux+ V8 security domain, protecting against " dictionary attacks " and " brute-force " attempts is a critical hardening step. A dictionary attack involves an automated script attempting thousands of common passwords against a user account.
To mitigate this, administrators use pam_tally2 (or the newer pam_faillock on some systems). The pam_tally2 module is specifically designed to keep track of failed login attempts for each user. It can be configured in the PAM stack (such as /etc/pam.d/common-auth or /etc/pam.d/password-auth) to lock an account after a specified number of consecutive failed attempts (e.g., deny=5). Once the threshold is reached, the user is blocked from further attempts for a set period or until an administrator manually resets the counter. This effectively stops automated dictionary attacks from continuing indefinitely.
The other options serve different purposes. pam_limits (Option B) is used to set resource limits (like CPU time or number of open files) for users once they are already logged in. pam_unix (Option C) is the standard module for traditional /etc/passwd and /etc/shadow authentication. pam_ldap (Option D) allows the system to authenticate against a remote LDAP directory.
While these modules are part of the PAM ecosystem, only pam_tally2 is designed for tracking and acting upon failed login counts to block attacks.
NEW QUESTION # 201
Which of the following commands can be used to display current CPU utilization in real time on a Linux system?
Answer: A
Explanation:
The correct answer is B. top because it provides a real-time, continuously updating view of system performance, including CPU utilization. The top command is one of the most widely used monitoring tools in Linux and is essential for system administrators when analyzing performance issues.
When executed, top displays a dynamic interface showing CPU usage percentages, memory consumption, load averages, running processes, and other critical system metrics. The CPU usage section is particularly useful because it breaks down usage into categories such as user space, system (kernel), idle time, and I/O wait. This allows administrators to quickly identify whether the CPU is under heavy load and which processes are consuming the most resources.
Option A (uptime) is incorrect because it provides load averages but does not give detailed or real-time CPU utilization percentages.
Option C (df) is incorrect because it reports disk space usage, not CPU activity.
Option D (lsblk) is incorrect because it lists block devices and storage structure, not CPU performance.
From a Linux+ system management perspective, tools like top, htop, and vmstat are critical for monitoring system health. Among these, top is the most fundamental and widely available tool for real-time CPU analysis. It enables administrators to detect performance bottlenecks, identify runaway processes, and take corrective action such as terminating processes or reallocating resources.
NEW QUESTION # 202
An administrator receives reports that a web service is not responding. The administrator reviews the following outputs:
Which of the following is the reason the web service is not responding?
Answer: B
Explanation:
The error log shows "cannot load certificate key /etc/pki/nginx/private/server.key", but the listing reveals that server.key is located in /etc/pki/nginx/ rather than the expected /etc/pki/nginx/private/ directory. Since the file exists but not where Nginx is configured to look, moving it to the correct directory resolves the issue.
NEW QUESTION # 203
Which of the following Ansible components is used to define groups and individual hosts and can include variables specific to each host or group?
Answer: B
NEW QUESTION # 204
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