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CompTIA Linux+ Certification Exam Sample Questions (Q146-Q151):

NEW QUESTION # 146
An administrator transferred a key for SSH authentication to a home directory on a remote server. The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without a password. However, the SSH command still asked for the password. Given the following output:

Which of the following commands would resolve the issue?

A. ssh_keygen -t rsa -o .ssh/authorized_keys
B. chmod 600 .ssh/authorized_keys
C. chown root:root .ssh/authorized_keys
D. restorecon .ssh/authorized_keys

Answer: D

NEW QUESTION # 147
Users have reported that the interactive sessions were lost on a Linux server. A Linux administrator verifies the server was switched to rescue.target mode for maintenance. Which of the following commands will restore the server to its usual target?

A. systemctl reboot
B. telinit 0
C. systemctl get-default
D. systemctl emergency

Answer: A

NEW QUESTION # 148
After starting an Apache web server, the administrator receives the following error:
Apr 23 localhost.localdomain httpd 4618] : (98) Address already in use: AH00072: make_sock: could not bind to address [: :]80 Which of the following commands should the administrator use to further trou-bleshoot this issue?

A. Nc
B. Ss
C. Ip
D. Dig

Answer: B

Explanation:
Explanation
The ss command is used to display information about socket connections, such as the port number, state, and process ID. The error message indicates that the port 80 is already in use by another process, which prevents the Apache web server from binding to it. By using the ss command with the -l and -n options, the administrator can list all the listening sockets and their port numbers in numeric form, and identify which process is using the port 80. For example: ss -ln | grep :80. The ip, dig, and nc commands are not relevant for this issue, as they are used for different purposes, such as configuring network interfaces, querying DNS records, and testing network connectivity.

NEW QUESTION # 149
A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following output:

Given there is a single CPU in the sever, which of the following is causing the slowness?

A. The system is running out of swap space.
B. The memory is exhausted.
C. The CPU is overloaded.
D. The processes are paging.

Answer: C

Explanation:
Explanation
The slowness is caused by the CPU being overloaded. The iostat command shows that the CPU utilization is
100%, which means that there are more processes competing for CPU time than the CPU can handle. The other options are incorrect because:
The system is not running out of swap space, as shown by the iostat command, which shows that there is no swap activity (si and so columns are zero).
The memory is not exhausted, as shown by the free -m command, which shows that there is still available memory (avail column) and free buffer/cache memory (buff/cache column).
The processes are not paging, as shown by the vmstat command, which shows that there are no major page faults (majflt column) and no swap activity (si and so columns). References: CompTIA Linux+ Study Guide, Fourth Edition, page 417-419, 424-425.

NEW QUESTION # 150
A junior administrator is trying to set up a passwordless SSH connection to one of the servers. The administrator follows the instructions and puts the key in the authorized_key file at the server, but the administrator is still asked to provide a password during the connection.
Given the following output:

Which of the following commands would resolve the issue and allow an SSH connection to be established without a password?

A. restorecon -rv .ssh/authorized_key
B. systemctl restart sshd.service
C. chmod 600 mv .ssh/authorized_key
D. mv .ssh/authorized_key .ssh/authorized_keys

Answer: D

Explanation:
Explanation
The command mv .ssh/authorized_key .ssh/authorized_keys will resolve the issue and allow an SSH connection to be established without a password. The issue is caused by the incorrect file name of the authorized key file on the server. The file should be named authorized_keys, not authorized_key.
The mv command will rename the file and fix the issue. The other options are incorrect because they either do not affect the file name (restorecon or chmod) or do not restart the SSH service (systemctl). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Managing Network Services, page 410.

NEW QUESTION # 151
......

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