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NEW QUESTION # 58
A Linux systems administrator needs to extract the contents of a file named /home/dev/web.bkp to the /var
/www/html/ directory. Which of the following commands should the administrator use?
Answer: B
Explanation:
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
File extraction and backup restoration are fundamental System Management tasks covered in CompTIA Linux+ V8. In this scenario, the administrator must extract the contents of an existing backup file into a target directory.
The correct command is option B, which uses cpio in extract mode. The command changes into the destination directory (/var/www/html/) using pushd, extracts the archive contents with cpio -idv, and then returns to the original directory with popd. This ensures that files are restored into the correct location without modifying paths inside the archive.
The cpio utility is commonly used for backups created with cpio -o and supports reading archive data from standard input. Linux+ V8 documentation includes cpio as a valid and supported archive format for backup and restore operations.
The other options are incorrect. Option A incorrectly assumes the backup is a gzip-compressed tar archive.
Option C creates a new archive instead of extracting one. Option D assumes the file is a ZIP archive, which is not indicated by the .bkp extension.
Linux+ V8 emphasizes using the correct tool based on the archive format and restoring files into the intended directory. Therefore, the correct answer is B.
NEW QUESTION # 59
A systems administrator needs to check access to all company servers. The administrator uses the following script, which does not complete:
for i in $(cat /home/user1.file)
do
echo $i
ssh $i uptime
Which of the following is missing from the script?
Answer: C
Explanation:
Shell scripting is a primary method for automating repetitive tasks in Linux. According to the CompTIA Linux+ V8 scripting objectives, administrators must understand the syntax for various control structures, including loops.
A for loop in Bash and other POSIX-compliant shells has a specific required structure:
* The for statement (to define the iteration).
* The do keyword (to start the block of commands).
* The loop body (the commands to execute).
* The done keyword (to terminate the loop block).
In the script provided, the administrator has correctly initiated the loop with for i in ... and opened the execution block with do. However, the script lacks the concluding done token. Without done, the shell interpreter will continue waiting for more input or return a syntax error because it does not know where the loop ends. This is why the script " does not complete " or run correctly.
The other options are related to different control structures. fi (Option A) is the closing token for an if statement, not a for loop. else (Option B) is an optional branch within an if statement. while (Option C) is a different type of loop entirely and is not a required token for a for loop.
Therefore, the missing token is verified as done.
NEW QUESTION # 60
A Linux administrator is updating the group membership by executing the following commands:
However, the group membership is not changing. Which of the following explains this issue?
Answer: A
Explanation:
Running groups with sudo shows the groups for the root user, not for the admin user. That's why the output only shows root. Without sudo, groups admin (or re-login) would correctly show the updated group membership, including wheel.
NEW QUESTION # 61
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?
Answer: D
Explanation:
Passwordless authentication using SSH key pairs is a foundational security practice covered in the Security domain of CompTIA Linux+ V8. It allows administrators to securely authenticate between systems without transmitting passwords over the network, significantly reducing the risk of credential compromise.
The correct approach involves two essential steps: generating an SSH key pair and installing the public key on the remote system. Option A correctly performs both steps using best-practice commands.
The command ssh-keygen -t rsa generates an RSA public/private key pair in the user's ~/.ssh/ directory. The private key (id_rsa) remains securely on the local system, while the public key (id_rsa.pub) is intended to be shared. The second part of the command, ssh-copy-id -i ~/.ssh/id_rsa.pub john@server2, securely copies the public key to the remote server's ~/.ssh/authorized_keys file. This enables key-based authentication for the specified user.
The other options are incorrect or incomplete. Option B uses ssh-keyscan, which is intended for collecting host keys to populate known_hosts, not for user authentication. Option C misuses ssh-agent, which manages keys already generated and does not create or install them. Option D is insecure and incorrect because copying the entire .ssh directory risks exposing private keys and violates security best practices.
Linux+ V8 documentation emphasizes the use of ssh-keygen and ssh-copy-id as the standard, secure method for configuring passwordless SSH access. This approach ensures proper permissions, correct key placement, and minimal risk.
NEW QUESTION # 62
Which of the following is a reason multiple password changes on the same day are not allowed?
Answer: C
Explanation:
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.
NEW QUESTION # 63
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