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NEW QUESTION # 86
A systems administrator is having issues installing packages in a Linux system. The administrator receives the following outputs:
Which of the following is the best command to fix this issue?
Answer: B
Explanation:
The CA bundle path is a symlink to a file under /etc/pki/ca-trust/extracted/pem, and update-ca- trust cannot create that generated bundle while SELinux is enforcing. Restoring the default SELinux contexts on that directory allows the bundle file to be created and fixes the certificate verification failures during package installs.
NEW QUESTION # 87
Which of the following describes how a user's public key is used during SSH authentication?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
During SSH public key authentication, the server checks if the user's public key is present in the ~/.ssh
/authorized_keys file. If the key is found, the server uses it to verify the user's identity by sending a challenge that can only be answered by the corresponding private key. This process does not involve password hashing or using the public key directly for encryption of the communication stream. Instead, the public key is simply used as a reference for authentication.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 11: "Securing Linux", Section: "SSH Key- Based Authentication" CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security
NEW QUESTION # 88
An administrator set up a new user account called " test " . However, the user is unable to change their password. Given the following output:
Which of the following is the most likely cause of this issue?
Answer: D
Explanation:
For normal users to change their own password, /bin/passwd must have the SUID bit set (permissions should be -rwsr-xr-x). The SUID bit allows users to run the program with the permissions of the file owner (root), which is required to update /etc/shadow. The provided output shows /bin/passwd does not have the SUID bit (no ' s ' in the owner's execute field). As a result, user " test " receives an " Authentication token manipulation error " . The password can be changed as root, which confirms it ' s a permissions/SUID issue.
Other options:
B). If the password didn't meet requirements, a different error would appear.
C). There is no minimum day limit preventing password change (see chage -l output).
D). The account and password are active (not disabled).
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 6: " User and Group Management " , Section: " Managing User Passwords and Policies " CompTIA Linux+ XK0-006 Objectives, Domain 1.0: System Management
NEW QUESTION # 89
A Linux administrator notices that an application is having trouble connecting to an external database. Which of the following commands should the administrator use to validate the connection to the remote port exposed by a database server?
Answer: D
Explanation:
This command tests connectivity to a specific remote host and port, allowing the administrator to verify whether the database service port is reachable from the system.
NEW QUESTION # 90
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: B
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 # 91
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