XK0-004 Free Practice Test

A Linux server has multiple IPs. A Linux administrator needs to verify if the HTTP server port is bound to the correct IP.
Which of the following commands would BEST accomplish this task?

1. A. route
2. B. host
3. C. nslookup
4. D. netstat
5. E. ip

Correct Answer: D

A Linux administrator has configured a Linux system to be used as a router. The administrator confirms that two network adapters are properly installed and functioning correctly. In addition, the output of the iptables –L command appears to contain a complete firewall configuration.
Which of the following commands does the administrator need to issue for the router to be fully functional?

1. A. echo “1” > /proc/sys/net/ipv4/ip_forward
2. B. echo “0” > /proc/sys/net/ipv4/tcp_abort_on_overflow
3. C. echo “0” > /proc/sys/net/ipv4/max_connections
4. D. echo “1” > /proc/sys/net/ipv4/ip_default_ttl

Correct Answer: A

A configuration management tool running every minute is enforcing the service HTTPd to be started. To perform maintenance, which of the following series of commands can be used to prevent the service from being started?

1. A. systemctl stop httpd && systemctl mask httpd
2. B. systemctl disable httpd && systemctl mask httpd
3. C. systemctl stop httpd && systemctl hide httpd
4. D. systemctl disable httpd && systemctl hide httpd

Correct Answer: A

A systems administrator configured a new kernel module, but it stopped working after reboot. Which of the following will allow the systems administrator to check for module problems during server startup?

1. A. lsmod
2. B. modprobe
3. C. modinfo
4. D. dmesg

Correct Answer: C

A junior Linux administrator needs to ensure a service will start on system boot. Which of the following commands should be used to accomplish this task?

1. A. chkconfig <service> on
2. B. systemctl bootup
3. C. service enable
4. D. crontab install

Correct Answer: A