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CompTIA XK0-004 Sample Questions
Question # 1
Which of the following are classified as Linux GUI servers? (Choose two.)
A. VNC B. KDE C. Gnome D. Wayland E. MATE F. X11
Question # 2
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
Question # 3
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
Question # 4
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
Question # 5
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
Question # 6
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.
Question # 7
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
Question # 8
In which of the following directories is the vmlinuz file located?
A. /boot B. /etc C. /bin D. /proc
Question # 9
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
Question # 10
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
Question # 11
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.
Question # 12
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
Question # 13
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
Question # 14
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
Question # 15
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
Question # 16
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
Question # 17
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
Question # 18
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
Question # 19
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
Question # 20
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
Question # 21
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 /
Question # 22
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
Question # 23
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
Question # 24
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
Question # 25
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
Question # 26
Which of the following servers provides encrypted tunnel SOCKS services?
A. SNMP B. VPN C. CA D. SSH
Question # 27
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
Question # 28
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
Question # 29
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
Question # 30
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
Question # 31
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.
Question # 32
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
Question # 33
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.
Question # 34
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
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