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NEW QUESTION # 132
Which of the following can reduce the attack surface area in relation to Linux hardening?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Reducing the attack surface area in Linux hardening refers to limiting possible points of unauthorized access.
According to the CompTIA Linux+ Official Study Guide (Exam XK0-006), enforcing strong password policies is a critical aspect of security hardening. This practice ensures that user accounts are protected by passwords that are difficult to guess or crack, thus minimizing the risk of successful brute-force attacks.
Implementing password complexity requirements (such as minimum length, use of uppercase, lowercase, numbers, and special characters) directly addresses one of the primary vectors for unauthorized access.
Other options do not have a direct impact on reducing the attack surface:
A). Customizing the log-in banner serves as a legal notification and does not affect system vulnerabilities.
B). Reducing the number of directories created is not related to hardening or access control.
C). Extending the SSH startup timeout period may give attackers more time to attempt a connection and does not increase security.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: " Securing the System " , Section: " Implementing Password Policies " CompTIA Linux+ XK0-006 Exam Objectives, Domain 3.0: Security
NEW QUESTION # 133
A systems administrator is helping to secure a new web application. During the tests, the administrator obtains the following output to validate the application:
SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
ALPN, server accepted to use http/1.1
Server certificate:
subject: CN=*.newapp.comptia.org
start date: Jan 17 00:00:00 2024 GMT
expire date: Feb 16 23:59:59 2034 GMT
issuer: C=US; O=Comptia; OU=IT Security; CN=ca1.comptia.org
SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
Which of the following explains the validation results?
Answer: C
Explanation:
The correct answer is A. The certificate was not signed by a trusted authority, which was forcefully ignored during the tests. The key indicator in the output is the message: "SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway." This error means that the client system cannot validate the certificate chain because it does not recognize or trust the certificate authority (CA) that issued the server certificate.
In TLS/SSL validation, the client must verify that the server's certificate chains up to a trusted root CA present in the local trust store. If the issuer (in this case, ca1.comptia.org) is not included in the client's trusted certificate authorities, the verification fails. However, the phrase "continuing anyway" indicates that the validation failure was bypassed-likely due to a testing flag such as -k or --insecure in curl-allowing the connection despite the trust issue.
Option B is incorrect because the certificate validity dates show it is valid from 2024 to 2034, not expired.
Option C is incorrect because wildcard certificates (e.g., *.newapp.comptia.org) are commonly used and not inherently insecure when properly managed.
Option D is incorrect because the cipher suite shown (ECDHE-RSA-AES256-GCM-SHA384) is considered strong and modern, not outdated.
From a Linux+ security perspective, proper certificate validation is critical. Administrators should ensure that the issuing CA is trusted by installing the correct CA certificates rather than bypassing validation, which exposes systems to man-in-the-middle attacks and other security risks.
NEW QUESTION # 134
Which of the following is the best use of AI within a Linux environment?
Answer: B
Explanation:
As AI and Large Language Models (LLMs) become integrated into IT workflows, CompTIA Linux+ V8 emphasizes the responsible and secure use of these tools. AI can significantly improve administrative efficiency when used as an assistant for repetitive or boilerplate tasks, but it introduces significant security and ethical risks if not governed properly.
The best and most appropriate use of AI among the options provided is generating configuration files for testing (Option D). AI is highly effective at creating standard templates, such as NGINX server blocks, systemd unit files, or basic shell scripts. This allows an administrator to quickly prototype a configuration.
However, the Linux+ curriculum stresses that any AI-generated output must be reviewed, linted, and tested by a human administrator before being moved to production.
The other options represent major security or professional risks:
* Option A: Giving full control to an AI engine is a violation of the principle of accountability and poses a significant risk to system stability and security.
* Option B: Uploading internal messaging or sensitive data to a public LLM can lead to intellectual property leaks and violations of privacy regulations.
* Option C: Outsourcing proprietary source code to a public AI model exposes the company ' s code base to external parties and may create licensing issues.
Using AI for generating non-sensitive configuration templates for development and testing environments is the verified best practice for leveraging these technologies securely in a Linux environment.
NEW QUESTION # 135
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:
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 # 136
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 # 137
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