CompTIA XK0-004 Dumps Questions Answers

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CompTIA XK0-004 Frequently Asked Questions

CompTIA XK0-004 Sample Questions

Question # 1

A systems administrator receives a report that the web server is not running after a planned system reboot.After starting the web server manually, which of the following commands should the administrator issue to ensure the web server starts at boot time?

A. systemctl service on 
B. systemctl enable <name>.service 
C. systemctl service enable 
D. systemctl on <name>.service 

Show Answer

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Question # 2

A user wants to alias dir so it always returns the contents of the ls -la command. However, the user has to reset the alias with every login.Which of the following is the BEST action the user can take to ensure the command is always available?

A. echo "alias dir=ls -la" > /etc/profile 
B. echo "alias dir=ls -la" >> /etc/skel 
C. echo "alias dir=ls -la" >> ~/.profile 
D. echo "alias dir=ls -la" > ~/.bashrc 

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Question # 3

An administrator needs to kill the oldest Bash shell running in the system. Which of the following commands should be issued to accomplish this task?

A. ps axjf | grep bash to obtain PID kill -9 PID 
B. ps –eo pid,etime,cmd | grep bash (to obtain PID) kill -9 PID 
C. ps –eo pid,etime| grep bash (to obtain PID) killall -9 PID 
D. killall -15 -o bash 

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Question # 4

A Linux team is using Git to version a set of custom scripts. A team member has made an update to a script and published the changes to the repository.Which of the following is the BEST way to retrieve the latest changes to the administrator's local working copy?

A. git fetch 
B. git merge 
C. git commit 
D. git pull 

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Question # 5

A junior systems administrator is scanning archive.tar files with an antivirus scanner. The administrator is given the following tasks: List all files that are in the archive.tar files.Extract all files from the archive.tar files.Which of the following actions should be performed to meet these requirements? (Choose two.)

A. tar -tvf archive.tar 
B. tar -xf archive.tar 
C. tar -A archive.tar 
D. tar -av archive.tar 
E. tar -r archive.tar 
F. tar -uvz archive.tar 

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Question # 6

A Linux administrator needs to disable the Sendmail service on a Linux server and prevent it from being started manually and during boot.Which of the following is the BEST command to do this?

A. systemctl reset-failed sendmail 
B. systemctl mask sendmail 
C. systemctl stop sendmail 
D. systemctl disable sendmail 

Show Answer

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Question # 7

A new IO card has been added to the security server to log the opening and closing of the main entrance. A switch is attached, so the interface card returns a 1 when the door is opened and a 0 when the door is closed.Which of the following describes the Linux device to which this switch is attached?

A. /dev/tty0 
B. /dev/port 
C. /dev/gpio 
D. /dev/sg0 

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Question # 8

A user wants to use terminal services from a Windows workstation to manage a Linux server. Which of the following should be installed on the Linux server to enable this functionality?

A. VNC 
B. rdesktop 
C. SPICE 
D. XRDP 

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Question # 9

A Linux administrator wants to configure log messages of critical or higher severity levels from the cron utility to be logged to the console. Which of the following will accomplish thisobjective?

A. Edit the /etc/logrotate.d/cron file to include the line cron.emerg.* /dev/console 
B. Edit the /etc/rsyslog.conf file to include the line cron.emerg.* /dev/console 
C. Edit the /etc/logrotate.conf file to include the line cron.emerg.* /dev/console 
D. Edit the /etc/rsyslog.d/conf file to include the line cron.emerg.* /dev/console 

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Question # 10

A Linux administrator is restoring the SELinux contexts on an entire system. Which of the following commands is the BEST option to complete this task?

A. setenforce 0 && reboot 
B. setfacl –bR / && reboot 
C. touch /.autorelabel && reboot 
D. restorecon / && reboot 

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Question # 11

Which of the following are classified as Linux GUI servers? (Choose two.)

A. VNC 
B. KDE 
C. Gnome 
D. Wayland 
E. MATE 
F. X11 

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Question # 12

A new user has been added to a Linux machine. Which of the following directories would contain the user’s default files?

A. /etc/login.defs 
B. /etc/passwd 
C. /etc/skel 
D. /etc/inittab 

Show Answer

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Question # 13

An issue was discovered on a testing branch of a Git repository. A file was inadvertently modified and needs to be reverted to the master branch version. Which of the following isthe BEST option to resolve the issue?

A. git branch -b master file 
B. git merge master testing 
C. git stash branch master 
D. git checkout master -- file 

Show Answer

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Question # 14

Which of the following boot methods can a Linux administrator use to boot a Linux server remotely via a network interface card instead of a local disk?

A. NTP 
B. PXE 
C. NFS 
D. Kickstart 

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Question # 15

A systems administrator manually added a new library to the server. The administrator wants to rebuild the library cache for immediate use.Which of the following commands should the systems administrator run to achieve this goal?

A. make install 
B. ldconfig 
C. make 
D. ldd 

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Question # 16

A new video card was added to a customer workstation. To get the new video card to work correctly, a systems administrator needs to remove support for the nouveau video driver on the Linux workstation.Which of the following will accomplish this task?

A. Use rmmod -f nouveau. 
B. Use modprobe -R nouveau. 
C. Add blacklist nouveau to /etc/modprobe.d/blacklist.conf. 
D. Add blacklist nouveau to /etc/modprobe.conf. 

Show Answer

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Question # 17

A user has been locked out of an account due to too many failed password attempts.Which of the following commands will unlock the user’s account?

A. pam_tally2 --user=user --reset 
B. passwd -u user -G root 
C. usermod -u user -G root 
D. chage -1 user=user --reset 

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Question # 18

In which of the following directories is the vmlinuz file located?

A. /boot 
B. /etc 
C. /bin 
D. /proc 

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Question # 19

A Linux administrator suspects unauthorized users are attempting to log in to the Linux server remotely. Which of the following should the administrator check FIRST?

A. /var/log/messages 
B. /var/log/secure 
C. /var/log/dmesg 
D. /var/log/kern.log 

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Question # 20

An administrator needs a bootable USB for installing a new Linux machine. The administrator downloaded the image file and named it as Linux_OS.iso in the /tmp directory. Which of the following commands will accomplish that task?

A. dd input=/tmp/Linux_OS.iso of=/dev/sda bs=512 
B. dd in=/tmp/Linux_OS.iso out=/dev/sdb bs=512 
C. dd if=/tmp/Linux_OS.iso of=/dev/sda bs=512 
D. dd if=/tmp/Linux_OS.iso out=/dev/sdb1 bs=512 

Show Answer

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Question # 21

A systems administrator is receiving errors while trying to install a popular virtualization software. The software specifications state the processor needs to support virtualization with Intel instructions. Additional requirements state the processor must accelerate encryption/decryption and use hyperthreading. Given the following output about the processor:fpu ume depse tsu msr pae mce cx8 apic sep mtrr pae mca cmov pat pse36 cflusm mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt aes xsave avx rdrand hypervisor lahf_lm fsgsbaseWhich of the following is the MOST likely reason for the errors?

A. The processor supports AMD instructions rather than Intel. 
B. The processor cannot accelerate decryption. 
C. The processor does not support hyperthreading. 
D. The processor is running inside a virtual machine. 

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Question # 22

Joe, a user, reports that he is no longer able to write files to his home directory. Upon inspection, the Linux administrator discovers that attempting to create a new file gives the following error: No space left on device. However, the disk and partition are not full. Which of the following commands would be BEST for the administrator to use to continue troubleshooting thisproblem?

A. rm -Rf ~/.* 
B. fsck -y /dev/sda1 
C. df -i 
D. fdisk /dev/sda 

Show Answer

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Question # 23

A raw VM image is being compressed with bzip2 and copied to a flash drive at /dev/hdb for off-site use by the marketing department. Which of the following command lines accomplishes this task?

A. mv /vm/mkgt.img | bzip2 /dev/hdb/mkgt.img.bz2 
B. bzip2 –c /vm/mktg.img | dd of=/dev/hdb 
C. cp /vm/mktg.img | bzip2 /dev/hdb/mktg.img.bz2 
D. cp –a –r /vm/mktg.img bzip2 /dev/hdb/mktg.img.zip 

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Question # 24

A Linux administrator tried to copy files to a remote server but received an error message indicating a lack of free space on the disk. The administrator issued a df command and verified adequate free space and inodes on the filesystem.Which of the following commands is the BEST way to diagnose the issue?

A. cat /proc/meminfo 
B. lsof -nP | grep deleted 
C. find / -type f -size +50M 
D. du -a / | sort -n -r | head -n 30 

Show Answer

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Question # 25

A Linux administrator needs to prevent the Postfix mail transfer agent from starting on boot.Which of the following commands will accomplish this task?

A. systemctl stop postfix.service 
B. /etc/init.d/postfix stop 
C. systemctl disable postfix.service 
D. /etc/init.d/postfix disable 

Show Answer

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Question # 26

An administrator needs to generate a list of services that are listening on TCP and/or UDP ports. Which of the following tools should the administrator use?

A. ethtool 
B. route 
C. netstat 
D. portmap 

Show Answer

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Question # 27

A systems administrator needs to run the yum update command two hours after employees log off and leave for the day on Friday.Which of the following is the BEST command to complete the task, if the task only needs to be run once?

A. screen 
B. cron 
C. at 
D. nohup 

Show Answer

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Question # 28

An administrator needs to change the DNS domain search order of a single Linux host to localize it better.Which of the following files should the administrator edit?

A. /etc/resolv.conf 
B. /etc/hosts 
C. /etc/nsswitch.conf 
D. /etc/dhcpd.conf 

Show Answer

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Question # 29

A company wants to provide internal identity verification services for networked devices.Which of the following servers should be installed?

A. SSH 
B. VPN 
C. CA 
D. DHCP 
E. DNS 

Show Answer

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Question # 30

A Linux administrator attempts to install the package newprogram.x86_64.rpm using a package manager. The administrator receives a warning indicating the command that was run was using a deprecated package manager. Which of the following commands should the administrator use to avoid the warning and install the newprogram.x86_64.rpm program?

A. # dnf install newprogram.x86_64.rpm 
B. # rpm -e newprogram.x86_64.rpm 
C. # dpkg -i newprogram.x86_64.rpm 
D. # apt-get install newprogram.x86_64.rpm 

Show Answer

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Question # 31

An administrator receives an alarm because the disk of one of the sewers is running out of space. Which of the following commands can be used to see the space that each partition is using?

A. df -h 
B. du -scg / 
C. fdisk -l 
D. fsck / 

Show Answer

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Question # 32

A file server is sharing a directory called /share between team members inside a company. The fileshare needs to be moved from serverA to /newshare located on serverB with all permissions and attributes preserved. Which of the following commands would BEST achieve this task?

A. rsync -aHAX /share/* serverB:/newshare 
B. dd if=/share/* of=serverB:/newshare 
C. tar -cvf /share/* serverB:/newshare 
D. mirrorlv /share/* serverB:/newshare 

Show Answer

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Question # 33

A junior systems administrator is tasked with providing the network_administrators group the ability to perform sudo without prompting for a password. Which of the following steps should the administrator perform to accomplish this task? (Choose two.)

A. Use visudo to edit the /etc/sudoers file and add network_administrators to the “wheel” group 
B. Use vi to edit the /etc/sudo file and add network_administrators to the “wheel” group 
C. Provide all network_administrators with the “root” account password 
D. Add the network_administrators ALL=(ALL) NOPASSWD: ALL directive to the /etc/sudoers file 
E. Add the network_administrators =(ALL) NOEXEC: ALL directive to the /etc/sudoers file 

Show Answer

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Question # 34

A technician suspects a company's border firewall is down, thus blocking Internet access. The technician executes the following commands: #ping -c 1 firewall.company.com 64 bytes from firewall.company.com (192.168.1.1): icmp_seq=1 ttl=64 time=0.061ms #ping -c 16 www.comptia.com 16 packets transmitted, 0 received, 100% packet loss, time 14999ms Which of the following commands should the technician use to BEST determine the source of this outage? 

A. tcpdump 
B. nmap 
C. dig 
D. traceroute 

Show Answer

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Question # 35

A Linux systems administrator is troubleshooting an issue with the /home directory running out of space. The administrator needs to determine which /home directories are using the most space. Which of the following commands should be used?

A. du 
B. lvs 
C. df 
D. fsck 

Show Answer

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Question # 36

Which of the following servers provides encrypted tunnel SOCKS services?

A. SNMP 
B. VPN
C. CA 
D. SSH 

Show Answer

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Question # 37

A Linux administrator is updating iptables rules and is given the following tasks: Output a list of iptables rules. Remove all iptables rules.Which of the following actions should be performed from the terminal console to accomplish these tasks? (Choose two.)

A. iptables -F 
B. iptables -L 
C. iptables -I 
D. iptables -C 
E. iptables -A 
F. iptables -N 

Show Answer

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Question # 38

A Linux administrator tries to ping a hostname in a network but receives the message: hostname not found. The administrator is sure the name exists on the network and wants to verify if the DNS server is correctly configured on the client. Which of the following files should the administrator use to verify this information?

A. /etc/named.conf 
B. /etc/resolv.conf
C. /etc/nsswitch.conf 
D. /etc/network 

Show Answer

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Question # 39

A user needs to modify the IP address of a laptop. Which of the following files can be used to configure the network interface named eth0?

A. /etc/sysconfig/network/interfaces.cnf 
B. /system/config/interfaces 
C. /etc/sysconfig/network-scripts/ifcfg-eth0 
D. /system/networking/ifconfig 
E. /etc/interfaces/eth0.conf 

Show Answer

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Question # 40

A systems administrator needs to conduct maintenance on a server.Which of the following commands will place the administrator in the appropriate runlevel?

A. init 0 
B. telinit 1 
C. init 3 
D. telinit 6 

Show Answer

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Question # 41

A Linux administrator recently reprovisioned a new corporate web server to replace a legacy one. To minimize the impact on the company's users, the administrator modified the network and DNS settings of the new server to be the same as the legacy server. When attempting to log in to the new server remotely over SSH, the following error message is displayed: WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!Which of the following should the administrator do to resolve the issue?

A. Restart the network services on both the remote server and the local machine. 
B. Remove the entry for the web server from the known_hosts file on the local machine. 
C. Update the /etc/hosts file on the remote server and local machine. 
D. Add the administrator's public key to the authorized_keys on the remote server. 

Show Answer

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Question # 42

On a UEFI-based system, which of the following invokes GRUB2 from the EFI command prompt?

A. boot//EFI/grub2.efi 
B. EFI/grub2.efi 
C. /boot/EFI/grub2.efi 
D. /grub2.efi 

Show Answer

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Question # 43

When requesting SSH access to a remote system, a user accidentally emailed the id_rsa key to the administrator. Which of the following should the user do NEXT?

A. Run the ssh-add command to add the remote system to known_hosts. 
B. Ask the administrator to run chmod 600 id_rsa on the remote system.
C. Delete id_rsa key file and send the id_rsa.pub key file instead. 
D. Stop using that key and run ssh-keygen to generate a new key pair. 

Show Answer

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Question # 44

An administrator is installing a new kernel but is getting an error indicating the filesystem is out of space. A disk usage check shows / has plenty of space.Which of the following BEST represents where the administrator should check next?

A. /var 
B. /proc 
C. /boot 
D. /etc 

Show Answer

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Question # 45

A server, which is used to collect data about the network and datacenter environment via SNMP, is running out of space. Which of the following should the server administrator implement to reduce disk utilization?

A. journald 
B. Snapshots 
C. logrotate 
D. tar -cvf 

Show Answer

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Question # 46

An administrator has a CSV file named hosts.csv. The contents of hosts.csv include the following: 192.168.2.57,lnx1prd.example.com,Linux,Production  92.168.2.58,lnx2prd.example.com,Linux,Production 192.168.1.4,server15.example.com,Windows,Development The administrator needs to create a second comma-separated list of only the Linux server IP addresses.Which of the following commands would achieve this need?

A. for ip in $(grep “Linux” hosts.csv | cut –d”,” –f1); do echo –n “$ip,”; done 
B. for ip in $( cut –d”,” –f1 hosts.csv | grep “Linux”); do echo –n “$ip,”; done 
C. for ip in $(grep “Linux” hosts.csv | sed “/$1//’); do echo –n “$ip,”; done 
D. for ip in $(awk –F, ‘{print $1}’ hosts.csv | grep “Linux”); do echo –n “$ip,”; done 

Show Answer

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Question # 47

A Linux user wants to give read-only permissions to a directory and its contents. Which of the following commands will allow the user to accomplish this task?

A. chmod –R 400 /new_directory/ 
B. chmod –R 600 /new_directory/ 
C. chmod 400 /new_directory/ 
D. chmod 600 /new_directory/ 

Show Answer

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Question # 48

A user is unable to write data to an NFS datastore at /mnt/storage. A df command indicates 50% free inodes.Which of the following commands should the user attempt NEXT to diagnose the situation?

A. df -h /mnt/storage 
B. du -sh /mnt 
C. fdisk -l /mnt/storage 
D. df -i /mnt/storage 

Show Answer

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Question # 49

An administrator needs to look at a log for an application on a systemd-based system. There is no log for this application in /var/log. Which of the following is another way to viewthe application log on this system?

A. tail -f /var/log/secure 
B. journalctl –u application 
C. systemctl application.service 
D. watch /var/lib/application/ 

Show Answer

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Question # 50

A Linux administrator needs to add some files in a directory to the Git repository but must exclude some local .tmp files that are occasionally created by the scripts.Which of the following is the BEST way to accomplish this task?

A. git rm .tmp 
B. git add -x .tmp * 
C. echo .tmp >> .gitignore 
D. rm -rf .tmp 

Show Answer

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Question # 51

A systems administrator wants to install a new application that requires the newmod kernel module. Which of the following commands should the systems administrator use?

A. lsof newmod 
B. modinfo newmod 
C. lsmod newmod 
D. modprobe newmod 

Show Answer

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Question # 52

A systems administrator needs to allow the Linux server to receive HTTP connections from Internet hosts. By default, the port for HTTP connections is blocked. Which of the followingrules should be added in the firewall to allow this type of connection?

A. firewall-cmd --zone=public --add-port=443/tcp --permanent 
B. firewall-cmd --zone=internal --add-port=80/tcp --permanent 
C. firewall-cmd --zone=public --add-port=80/tcp --permanent 
D. firewall-cmd --zone=internal --add-port=443/tcp --permanent 

Show Answer

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Question # 53

A Linux administrator looks at the /etc/timezone file and determines the need to change the time zone from California to New York temporarily. Which of the following commands willaccomplish this?

A. sed -f TZ=America/New_York 
B. cat TZ=America/New_York 
C. export TZ=America/New_York 
D. printf TZ=America/New_York 

Show Answer

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Question # 54

Joe, a member of the accounting group on a Linux system, is unable to write a file called “taxes” in the accounting shared directory. The ownership and permissions on the directoryand file are as follows: accounting drwxrw-r-- user = ann, group = accounting taxes -rw-r--r-- , user = ann, group = accountingWhich of the following commands would allow Joe to write to the file? (Choose two.)

A. chmod g+x accounting 
B. chmod 777 taxes 
C. chgrp taxes accounting 
D. chgrp accounting taxes 
E. chmod 774 accounting 
F. chmod u+x accounting 

Show Answer

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Question # 55

A storage administrator in a virtualized environment has been told by a user that there is no space left on the volume to which the user can write. However, a check reveals that there is 20GB of unused space. Which of the following explains the discrepancy?

A. The drive is not formatted 
B. The drive is thin provisioned 
C. The drive is thick provision eager zeroed 
D. The drive space is overallocated 

Show Answer

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Question # 56

Which of the following BEST describes build automation?

A. Automating the creation of software and related processes 
B. Automatically categorizing servers in the infrastructure 
C. Managing and provisioning servers via automatic templates 
D. Bringing systems in line with the desired automated configuration 

Show Answer

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Question # 57

The following represents a partial listing of a user’s .bashrc file: HISTSIZE=800 HISTFILESIZE=1000 umask 2002 HISTCONTROL=ignoreboth When the user opens a terminal, an error message appears: Octal number out of range Which of the following lines in the partial .bashrc should be modified to prevent the error from occurring? 

A. HISTSIZE=800 
B. HISTFILESIZE=1000 
C. umask 2002 
D. HISTCONTROL=ignoreboth 

Show Answer

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Question # 58

A systems administrator is implementing disk quotas on /home. During the process, the administrator receives the following error: Cannot find filesystem to check or filesystem not mounted with user quota option.Which of the following is the correct order of steps the administrator should follow to resolve this error?

A. 1. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it. 2. Remount /home. 3. Create the quota database files and generate the disk usage table.  4. Assign user quota policies. 
B. 1. Create the quota database files and generate the disk usage table. 2. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it. 3. Remount /home.  4. Assign user quota policies. 
C. 1. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it. 2. Create the quota database files and generate the disk usage table. 3. Remount /home. 4. Assign user quota policies. 
D. 1. Assign user quota policies. 2. Verify if /home has quotas enabled in /etc/fstab and, if not, enable it. 3. Create the quota database files and generate the disk usage table.  4. Remount /home. 

Show Answer

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