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NEW QUESTION # 174
Following the completion of monthly server patching, a Linux administrator receives reports that a critical application is not functioning. Which of the following commands should help the administrator determine which packages were installed?
Answer: C
Explanation:
The dnf history command shows a log of past package operations (install, update, remove), allowing the administrator to review which packages were installed or updated during the patching process.
NEW QUESTION # 175
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 # 176
In the echo "profile-$num-$name"line of a shell script, the variable $numseems to not be expanding during execution. Which of the following notations ensures the value is expanded?
Answer: D
Explanation:
Using ${num} ensures correct variable expansion, especially when variables are adjacent to other characters or hyphens. This prevents ambiguity and guarantees $num is properly expanded within the string.
NEW QUESTION # 177
A systems administrator receives reports about connection issues to a secure web server. Given the following firewall and web server outputs:
Firewall output:
Status: active
To Action From
443/tcp DENY Anywhere
443/tcp (v6) DENY Anywhere (v6)
Web server output:
tcp LISTEN 0 4096 *:443 :
Which of the following commands best resolves this issue?
Answer: B
Explanation:
This scenario involves firewall configuration and service accessibility, which falls under the Security domain of the CompTIA Linux+ V8 objectives. The key to resolving this issue is interpreting both the firewall output and the web server status correctly.
The web server output shows that the service is actively listening on TCP port 443, which is the standard port for HTTPS (secure web traffic). The line tcp LISTEN 0 4096 *:443 *:* confirms that the web server is running properly and is ready to accept incoming connections on port 443 from any interface. This indicates that the problem is not with the web server configuration itself.
However, the firewall output clearly shows that incoming connections to port 443 are being blocked. The rules 443/tcp DENY Anywhere and 443/tcp (v6) DENY Anywhere (v6) indicate that the Uncomplicated Firewall (UFW) is explicitly denying HTTPS traffic for both IPv4 and IPv6. As a result, external clients cannot establish a secure connection to the server, even though the service is running correctly.
To resolve this issue securely and correctly, the administrator must remove the firewall rule that denies HTTPS traffic. Option C, ufw delete deny https/tcp, directly removes the blocking rule while preserving the rest of the firewall configuration. This aligns with Linux+ best practices, which emphasize making precise firewall changes rather than disabling security controls entirely.
The other options are incorrect. Option A, ufw disable, would completely turn off the firewall, creating a significant security risk. Option B, ufw allow 80/tcp, only opens HTTP traffic on port 80 and does not resolve HTTPS connectivity issues. Option D, ufw allow 4096/tcp, incorrectly attempts to open an internal socket backlog value rather than a valid service port.
Therefore, the correct and most secure solution is C.
NEW QUESTION # 178
Which of the following commands can be used to display current CPU utilization in real time on a Linux system?
Answer: B
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.
NEW QUESTION # 179
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