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In dieser dynamischen Welt lohnt sich, etwas für berufliche Weiterentwicklung zu tun. Angesichts des Fachkräftemangels in vielen Branchen haben Sie mit einer CompTIA XK0-006 (CompTIA Linux+ Certification Exam) Zertifizierung mehr Kontrolle über Ihren eigenen Werdegang und damit bessere Aufstiegschancen.
74. Frage
A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes. Which of the following commands will accomplish this task?
Antwort: D
Begründung:
The ssh-keygencommand is used to generate SSH key pairs. To generate an RSA key with a length of 4096 bits, the correct syntax is:
-t rsa: Specifies the type of key to generate, which is RSA.
-b 4096: Specifies the number of bits for the key, in this case 4096.
By running this command, the user will be prompted to enter a passphrase to password-protect the key, which satisfies the requirement for generating a password-protected RSA key of 4096 bits.
75. Frage
User1 reports "access denied" errors while trying to execute app. Given the following outputs:
Which of the following options will remediate this issue?
Antwort: A
Begründung:
According to the output of getfacl app, user1 has only "rw" (read and write) permissions, but lacks "x" (execute). Without execute permission, user1 cannot run the file. To allow user1 to execute app, you must update the ACL to add execute permission (e.g., setfacl -m u:user1:rwx app). Modifying "others" permissions (option B) is not secure or necessary, adding user1 to the wheel group (option C) is unrelated, and moving the file (option D) does not resolve permission issues.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 7: "Securing Linux Systems", Section:
"Managing File and Directory Permissions and ACLs"
CompTIA Linux+ XK0-006 Objectives, Domain 3.0: Security
76. Frage
An administrator needs to verify the user ID, home directory, and assigned shell for the user named
"accounting." Which of the following commands should the administrator use to retrieve this information?
Antwort: A
Begründung:
User account information is centrally stored in the system's account databases, and Linux+ V8 emphasizes the use of standard tools to query this data safely and consistently.
The getent passwd accounting command retrieves the user's entry from the passwd database, which may be sourced from local files or network services such as LDAP. This entry includes the username, user ID (UID), group ID (GID), home directory, and assigned login shell. Therefore, option A provides all the requested information in a single command.
Option B, id accounting, displays the UID and group memberships but does not show the home directory or assigned shell. Option C is incorrect because /etc/shadow contains password hashes and expiration data, not shell or home directory information. Option D, who accounting, only shows login sessions and does not provide account configuration details.
Linux+ V8 documentation highlights getent passwd as the preferred method for retrieving comprehensive user account information because it works across different authentication backends.
Thus, the correct answer is A.
77. Frage
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?
Antwort: D
Begründung:
This command generates an SSH key pair and securely copies the public key to the remote server, enabling passwordless authentication by allowing key-based SSH login between the systems.
78. Frage
Which of the following is a reason multiple password changes on the same day are not allowed?
Antwort: B
Begründung:
Password policy enforcement is a critical component of system security covered in the CompTIA Linux+ V8 objectives. One common control implemented in Linux systems is restricting how frequently users can change their passwords, often referred to as minimum password age enforcement.
The primary reason multiple password changes within a short time frame are not allowed is to prevent password cycling attacks. Without this restriction, a user could repeatedly change their password in quick succession to bypass password history controls and eventually reuse a previously compromised or weak password. Option C accurately describes this scenario and aligns directly with Linux+ V8 security guidance.
Linux systems enforce this behavior through tools such as chage and PAM (Pluggable Authentication Modules). Administrators can configure minimum password age values to ensure users must wait a defined period before changing passwords again. This ensures that password history requirements are effective and meaningful.
The other options are incorrect. Option A confuses password expiration with brute-force mitigation, which is typically addressed through account lockout policies. Option B refers to password complexity, which is enforced through character requirements rather than change frequency. Option D is unrelated, as password expiration policies do not enforce multifactor authentication.
Linux+ V8 documentation emphasizes layered access controls, and preventing password reuse through enforced timing restrictions is a core principle of secure authentication design.
Therefore, the correct answer is C.
79. Frage
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