Question # 1
| A Linux administrator needs to determine if prerequisites are met. One of the application requirements is to install Perl on a system. Which of the following commands would accomplish this task? | | A. rpm -Ufperl | | B. rpm -ivperl | | C. rpm -qaperl | | D. rpm -ehperl |
C. rpm -qaperl
Question # 2
After connecting to a remote host via SSH, an administrator attempts to run an application but receives the following error:
arduino
Error: cannot open display:
Which of the following should the administrator do to resolve this error?
| | A. Disconnect from the SSH session and reconnect using the ssh -X command | | B. Add Options X11 to the /home/admin/.ssh/authorized_keys file | | C. Open port 6000 on the workstation and restart the firewalld service | | D. Enable X11 forwarding in /etc/ssh/ssh_config and restart the server |
D. Enable X11 forwarding in /etc/ssh/ssh_config and restart the server
Explanation:
The error indicates that X11 forwarding is not enabled. X11 forwarding allows graphical applications to be displayed on a remote system over an SSH connection. Enabling X11 forwarding in /etc/ssh/ssh_config and restarting the SSH service ensures that the necessary configuration is applied, allowing the administrator to open graphical applications remotely.
Question # 3
| A non-privileged user is attempting to use commands that require elevated account permissions, but the commands are not successful. Which of the following most likely needs to be updated? | | A. /etc/passwd | | B. /etc/shadow | | C. /etc/sudoers | | D. /etc/bashrc |
C. /etc/sudoers
Explanation:
The /etc/sudoers file is used to configure the sudo command, which allows non-privileged users to execute commands that require elevated account permissions1. The file contains a list of users and groups that are allowed to use sudo, and the commands they can run with it. The file also defines the security policy for sudo, such as whether a password is required, how long the sudo session lasts, and what environment variables are preserved or reset.
The /etc/passwd file is used to store information about the user accounts on the system, such as their username, user ID, home directory, and login shell. The /etc/shadow file is used to store the encrypted passwords for the user accounts, along with other information such as password expiration and aging. These files are not directly related to the sudo command, and updating them will not grant a user elevated account permissions.
The /etc/bashrc file is used to set up the environment for the bash shell, such as aliases, functions, variables, and options. This file is executed whenever a new bash shell is started, and it affects all users on the system. However, this file does not control the sudo command or its configuration, and updating it will not allow a user to use commands that require elevated account permissions.
Question # 4
A user (userA) has reported issues while logging in to the system. The following output has been provided:
bash
Could not chdir to home directory /home/userA: Permission denied
-bash: /home/userA/.bash_profile: Permission denied # cat /etc/passwd | grep userA
userA:x:1234:3400:userA account:/home/userA/:/bin/bash # passwd -S userA
userA PS 2022-10-17 1 99999 0 (Password set. SHA512 crypt.)
# groups userA
admin dev usergrp # ls -lth /home/
drwx 7 root admin 9 Jan 17 2019 userA
drwxr-xr-x 4 userC app 9 Jan 23 2020 userC
Which of the following describes the issue userA is having?
| | A. The password for userA is not set | | B. The group for userA is not assigned correctly | | C. The account password for userA has expired | | D. The assigned home directory is not owned by userA |
D. The assigned home directory is not owned by userA
Explanation:
The issue occurs because the home directory /home/userA is owned by root, not by userA, as seen from the ls -lth /home output. In Linux, the user must have ownership of their home directory to log in and access their files properly. To fix this, the administrator must change ownership using chown userA:userA /home/userA.
Question # 5
A Linux engineer set up two local DNS servers (10.10.10.10 and 10.10.10.20) and was testing email connectivity to the local mail server using the mail command on a localmachine when the following error appeared:
Which of the following commands could the engineer use to query the DNS server to get mail server information? | | A. dig @example.com 10.10.10.20 a | | B. dig @10.10.10.20 example.com mx | | C. dig @example.com 10.10.10.20 ptr | | D. dig @10.10.10.20 example.com ns |
B. dig @10.10.10.20 example.com mx
Question # 6
| An administrator started a long-running process in the foreground that needs to continue without interruption. Which of the following keystrokes should the administrator use to continue running the process in the background? | | A. bg | | B. bg | | C. jobs -1 | | D. bg & |
A. bg
Question # 7
A user is unable to log on to a Linux workstation. The systems administrator executes the following command:
cat /etc/shadow | grep user1
The command results in the following output:
user1 :! $6$QERgAsdvojadv4asdvaarC/9dj34GdafGVaregmkdsfa:18875:0:99999:7 ::: Which of the following should the systems administrator execute to fix the issue?
| | A. chown -R userl:user1 /home/user1 | | B. sed -i '/ ::: / :: /g' /etc/shadow | | C. chgrp user1:user1 /home/user1 | | D. passwd -u user1 |
D. passwd -u user1
Explanation:
The output shows that the user1 account has a locked password, indicated by the exclamation point (!) in the second field of the /etc/shadow file1. To unlock the password and allow the user to log in, the systems administrator should use the passwd command with the -u (unlock) option2.
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