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NEW QUESTION 663
As part of the requirements for installing a new application, the swappiness parameter needs to be changed to 0. This change needs to persist across reboots and be applied immediately. A Linux systems administrator is performing this change. Which of the following steps should the administrator complete to accomplish this task?
A.   echo “vm.swappiness=0” >> /etc/sysctl.conf && sysctl -p
B.   echo “vm.swappiness=0” >> /proc/meminfo && sysctl -a
C.   sysctl -v >> /proc/meminfo && echo “vm.swapiness=0”
D.   sysctl -h “vm.swapiness=0” && echo /etc/vmswapiness
Answer: A
Explanation:
To persist the parameter value indefinitely — that is, until the user wants to change it again – they must manually update the sysctl.conf file. The command calls the nano text editor, which lets the user edit the file directly in the terminal. When the file opens, the user scrolls to the end of the text and adds the following setting:
“vm.swappiness=0”
>> append /etc/sysctl.conf && sysctl -p
sysctl -p (allows you to load the settings from a configuration file)
NEW QUESTION 664
A systems administrator wants to list all local accounts in which the UID is greater than 500. Which of the following commands will give the correct output?
A.   find /etc/passwd -size +500
B.   cut -d: -f1 /etc/passwd > 500
C.   awk -F: ‘$3 > 500 {print $1}’ /etc/passwd
D.   sed ‘/UID/’ /etc/passwd < 500
Answer: C
NEW QUESTION 665
A systems administrator is tasked with changing the default shell of a system account in order to disable iterative logins. Which of the following is the BEST option for the administrator to use as the new shell?
A.   /sbin/nologin
B.   /bin/sh
C.   /sbin/setenforce
D.   /bin/bash
Answer: A
Explanation:
In order to limit the login we can add /bin/false to the end of the string (in the file /etc/passwd ), thus we will have a return code = 1 (when the user tries to open the terminal it will close immediately). Another method, in the same way, we add /sbin/nologin (in this case I will have the message “This account is currently not available” ).
NEW QUESTION 666
A junior systems administrator recently installed an HBA card in one of the servers that is deployed for a production environment. Which of the following commands can the administrator use to confirm on which server the card was installed?
A.   lspci | egrep ‘hba|fibr’
B.   lspci | zgrep ‘hba|fibr’
C.   lspci | pgrep ‘hba|fibr’
D.   lspci | ‘hba|fibr’
Answer: A
Explanation:
Egrep is a shortcut to the grep -E command. The -E option allows the use of regular expressions for text filtering. For example: +, |, () etc.
NEW QUESTION 667
A new disk was presented to a server as /dev/sdd. The systems administrator needs to check if a partition table is on that disk. Which of the following commands can show this information?
A.   lsscsi
B.   fdisk
C.   blkid
D.   partprobe
Answer: B
NEW QUESTION 668
A systems administrator wants to upgrade /bin/someapp to a new version, but the administrator does not know the package name. Which of the following will show the RPM package name that provides that binary file?
A.   rpm -qf /bin/someapp
B.   rpm -vv /bin/someapp
C.   rpm -p /bin/someapp
D.   rpm -i /bin/someapp
Answer: A
Explanation:
Use the command ‘rpm -qf’ or ‘yum whatprovides’ to get the package name from a binary file or library file on the server.
NEW QUESTION 669
A systems administrator is installing various software packages using a package manager. Which of the following commands would the administrator use on the Linux server to install the package?
A.   winget
B.   softwareupdate
C.   yum-config
D.   apt
Answer: D
NEW QUESTION 670
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 &
Answer: A
NEW QUESTION 671
A Linux administrator has physically added a new RAID adapter to a system. Which of the following commands should the Linux administrator run to confirm that the device has been recognized? (Choose two.)
A.   rmmod
B.   ls -ll /etc
C.   lshw -class disk
D.   pvdisplay
E.   rmdir /dev
F.   dmesg
Answer: CF
NEW QUESTION 672
Based on the given command:
find /home/user1 -type f -name “*.txt” -size +100M
Which of the following will the command accomplish?
A.   It finds all the files ending with .txt with a size less than 100MB in /home/user1 directory.
B.   It finds all the files ending with .txt with a size of 100MB in /home/user1 directory.
C.   It finds all the directories with .txt files with a size of 100MB in /home folder.
D.   It finds all the files ending with .txt with a size of over 100MB in /home/user1 directory.
Answer: D
NEW QUESTION 673
A senior Linux administrator has created several scripts that will be used to install common system applications. These scripts are published to a repository to share with the systems team. A junior Linux administrator needs to retrieve the scripts and make them available on a local workstation. Which of the following Git commands should the junior Linux administrator use to accomplish this task?
A.   fetch
B.   checkout
C.   clone
D.   branch
Answer: C
NEW QUESTION 674
Users are reporting that writes on a system configured with SSD drives have been taking longer than expected, but reads do not seem to be affected. A Linux systems administrator is investigating this issue and working on a solution. Which of the following should the administrator do to help solve the issue?
A.   Run the corresponding command to trim the SSD drives.
B.   Use fsck on the filesystem hosted on the SSD drives.
C.   Migrate to high-density SSD drives for increased performance.
D.   Reduce the amount of files on the SSD drives.
Answer: A
Explanation:
TRIM is the function that allows you to improve the long-lasting performance of SSDs by better managing the various reads and writes of the cells, so you will not only increase the life of the SSD but also speed up the read and write operations. SSD TRIM is an Advanced Technology Attachment (ATA) command that enables an operating system to inform a NAND flash solid-state drive (SSD) which data blocks it can erase because they are no longer in use. The use of TRIM can improve the performance of writing data to SSDs and contribute to longer SSD life.
NEW QUESTION 675
A Linux engineer needs to block an incoming connection from the IP address 2.2.2.2 to a secure shell server and ensure the originating IP address receives a response that a firewall is blocking the connection. Which of the following commands can be used to accomplish this task?
A.   iptables -A INPUT -p tcp –dport ssh -s 2.2.2.2 -j DROP
B.   iptables -A INPUT -p tcp –dport ssh -s 2.2.2.2 -j RETURN
C.   iptables -A INPUT -p tcp –dport ssh -s 2.2.2.2 -j REJECT
D.   iptables -A INPUT -p tcp –dport ssh -s 2.2.2.2 -j QUEUE
Answer: C
Explanation:
In general, use REJECT if you want the other side to know that the port is unreachable, and DROP for connections to hosts you don’t want to see.
NEW QUESTION 676
A junior administrator updated the PostgreSQL service unit file per the database administrator’s recommendation. The service has been restarted, but changes have not been applied. Which of the following should the administrator run for the changes to take effect?
A.   systemctl get-default
B.   systemctl daemon-reload
C.   systemctl enable postgresql
D.   systemctl mask postgresql
Answer: B
NEW QUESTION 677
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