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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting | 22% | - System and hardware issues
|
| Topic 2: System Management | 23% | - Installation, configuration, and maintenance
|
| Topic 3: Services and User Management | 20% | - User and group administration
|
| Topic 4: Security | 18% | - Access control and authentication
|
| Topic 5: Automation and Scripting | 17% | - Shell scripting and automation
|
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NEW QUESTION # 128
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
admin@192.168.10.50: Permission denied (publickey,password)
After seeing the message, the administrator attempts to connect using ssh -v admin@192.168.10.50 and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm
Which of the following actions should the administrator take first to remediate this issue?
Answer: D
Explanation:
The "no mutual signature algorithm" error means the RSA/SHA-1 key type (ssh-rsa) isn't supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.
NEW QUESTION # 129
A Linux user frequently tests shell scripts located in the /home/user/scripts directory. Which of the following commands allows the user to run the program by invoking only the script name?
Answer: B
Explanation:
In Linux, the ability to execute a program by typing only its name depends on whether the directory containing the executable is included in the user's PATH environment variable. The PATH variable defines a colon-separated list of directories that the shell searches when a command is entered.
Option C, export PATH=$PATH:/home/user/scripts, correctly appends the /home/user/scripts directory to the existing PATH variable. Once this command is executed, any executable script located in that directory can be run simply by typing its filename, provided the script has execute permissions. This behavior is explicitly covered in the Linux+ V8 objectives related to environment variables and shell configuration.
The other options are incorrect. Option A incorrectly attempts to redefine the SHELL variable and uses invalid syntax. Option B modifies the TERM variable, which controls terminal type and has nothing to do with command execution. Option D attempts to create an alias using invalid syntax and would not affect command lookup behavior.
Linux+ V8 documentation emphasizes modifying the PATH variable as the standard and recommended method for simplifying script execution. This approach is commonly used by developers and administrators who frequently run custom scripts.
Therefore, the correct answer is C.
NEW QUESTION # 130
Which of the following Linux directories contains documentation for installed software packages and shareable system files?
Answer: B
Explanation:
The /usr directory contains shareable, read-only system data, including documentation, binaries, libraries, and other files provided by installed software packages.
NEW QUESTION # 131
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands;
Which of the following is the cause of the issue?
Answer: D
Explanation:
This issue is a classic example of post-reboot connectivity troubleshooting, which falls under the Troubleshooting domain of CompTIA Linux+ V8. The administrator has correctly gathered evidence using multiple diagnostic tools, allowing the root cause to be identified through correlation.
The ss -lnt output confirms that the SSH daemon is running and listening on TCP port 22. This eliminates the possibility that the SSH service failed to start after reboot. Additionally, the uptime output shows a very low load average, indicating that system performance is not a limiting factor. The successful ping test confirms that the server is reachable at the network layer and that DNS resolution and basic connectivity are functioning correctly.
The critical clue comes from the firewall configuration. The output of firewall-cmd --list-all shows that only specific services are allowed through the firewall, such as https, dns, and cockpit. The SSH service is notably absent. On systems using firewalld, services must be explicitly allowed, even if the daemon itself is running and listening on the correct port.
As a result, incoming SSH connection attempts are being blocked by the firewall, preventing users from accessing the server remotely after reboot. This aligns precisely with option B.
The other options are incorrect. DNS is functioning, as shown by successful ping responses. System load is low and not contributing to the issue. There is no indication that users are attempting to access the web server using an incorrect protocol.
Linux+ V8 documentation emphasizes that administrators must verify both service status and firewall rules when diagnosing access issues. In this case, allowing SSH with a command such as firewall-cmd --add- service=ssh --permanent followed by a reload would resolve the problem.
NEW QUESTION # 132
Which of the following utilities supports the automation of security compliance and vulnerability management?
Answer: D
Explanation:
OpenSCAP is a framework that automates security compliance checking and vulnerability management by using standardized security content (SCAP). It helps administrators enforce policies and detect vulnerabilities.
NEW QUESTION # 133
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