CompTIA XK0-004 Online Practice Questions and Exam Preparation

CompTIA XK0-004 Online Questions & Answers

• Question 211:

  Which of the following can be used to check the status of wireless devices that are connected to the system?

  A. lsusb
  B. iwconfig
  C. netstat
  D. ifconfig
  B. iwconfig

• Question 212:

  A Linux systems administrator is setting up SSH access with PKI for several using their newly created RSA keys. Which of the following MOST securely achieves this task?

  A. Use curl to copy each user's public key file to the respective system
  B. Use cp to copy each user's public key file to the respective system
  C. Use ssh-copy-id to copy each user's public key file to the respective system
  D. Use ssh-copy-id to copy each user's private key file to the respective system
  C. Use ssh-copy-id to copy each user's public key file to the respective system

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  Reference: https://www.linode.com/docs/security/authentication/use-public-key-authentication-with-ssh/

• Question 213:

  A Linux user needs to connect to a remote email server named mail.foo.com through the SMTP port.

  Which of the following commands will accomplish this task?

  A. traceroute mail.foo.com 25
  B. netcat mail.foo.com 25
  C. traceroute mail.foo.com 110
  D. netcat mail.foo.com 110
  B. netcat mail.foo.com 25

• Question 214:

  A newly installed desktop is unable to connect to networked resources. The systems administrator executes various commands and reviews the following output snippets: Which of the following should the systems administrator try NEXT to restore connectivity?

  

  A. arp -s 20:ad:1f:ab:10:0f 192.168.1.10
  B. route add -net 192.168.1.0 netmask 255.255.255.0
  C. dig -x @127.0.0.1 192.168.1.10
  D. ip link set wlo1 up
  E. killall -HUP NetworkManager
  D. ip link set wlo1 up

• Question 215:

  A Linux administrator needs to implement a secunty policy that prevents all connections from the marketing department that has the IP subnet 10.10.10.0/24 from reaching the current server. Which of the following commands can BEST accomplish this task?

  A. iptables -A output -s 10.10.10.0/24 -j DROP
  B. iptables -A input -s 10.10.10.0/24 -j ACCEFT
  C. iptables -A forward -s 10.10.10.0/24 -j ACCEPT
  D. iptables -A input -s 10.10.10.0/24 -j DROP
  B. iptables -A input -s 10.10.10.0/24 -j ACCEFT

• Question 216:

  A systems administrator is attempting to connect a printer to the network. After installing the printer, the systems admnstrator wants to provide a pnnting interface for network users to detect printers dynamically.

  Which of the following would all...

  A. HBA
  B. CUPS
  C. USB
  D. LPO
  B. CUPS

• Question 217:

  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
  B. /proc

• Question 218:

  A Linux administrator is configuring a web server that connects to an external SQL database. However, after starting the web application, the logs are showing an error message:

  

  Which of the following is the BEST way to resolve this issue?

  A. echo 0 > seLinux/enforce
  B. restorecon -rv /var/www/ html
  C. sed -1 s/'SELINUX. */SELINUX''permissive// etc/selinux/config
  D. setseboo1 -p http-can-network_connect_db 1
  C. sed -1 s/'SELINUX. */SELINUX''permissive// etc/selinux/config

• Question 219:

  Which of the following can cause a kernel panic message after a system reboot?

  A. Processor failure
  B. PXE boot failure
  C. USB device failure
  D. Drive failure
  D. Drive failure

• Question 220:

  A user creates a key pair to configure RSA authentication on a Linux server. Which of the following should the user do NEXT?

  A. Copy the id_rsa.pub file contents to the server
  B. Copy the id_rsa file contents to the server
  C. Use ssh-add to install the id_rsa.pub on the client
  D. Copy the known_hosts file contents to the client
  E. Copy the known_hosts file contents to the server
  B. Copy the id_rsa file contents to the server

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  Reference: https://www.ibm.com/docs/en/svgaa?topic=kbaula-enabling-rsa-key-based-authentication-unix-linux-operating-systems-1