XK0-005 Practice Test 24 — 15 Questions

Question 1

Refer to the exhibit. A technician sees that the httpd service has failed. Which command was used to view the detailed error log shown in the exhibit?

Accepted Answer

journalctl -u httpd. Option B is correct because the exhibit shows output from 'journalctl -u httpd.service'. Option A: 'systemctl status httpd' shows a different format; C: 'tail -f /var/log/messages' might show similar but not the specific service unit logs; D: 'systemctl show httpd' shows service properties, not logs.

Answer

systemctl status httpd

Answer

tail -f /var/log/messages

Answer

systemctl show httpd

Question 2

An administrator is tasked with setting up a new server that will run a time-sensitive application. The system must have accurate time synchronization. The administrator configures chronyd and adds four NTP servers. After verifying, the administrator notices that the system time drifts significantly. Which configuration parameter in /etc/chrony.conf is most likely causing the drift despite multiple servers?

Accepted Answer

local stratum 10. Option C is correct because if the local clock is set as a prefer time source with high trust, chronyd may use it over NTP servers, causing drift. Option A is wrong because a large maxslewrate can cause rapid time adjustments but not drift. Option B is wrong because a large makestep would allow stepping, not cause drift. Option D is wrong because a small pollinterval would increase polling frequency, reducing drift. Option E is wrong because minsources is the minimum number of sources to synchronize; if set too low, it might accept inaccurate time, but drift is more likely due to local clock behavior.

Answer

pollinterval 2

Answer

minsources 2

Answer

makestep 100 -1

Answer

maxslewrate 1000

Question 3

A system administrator needs to configure a daily backup that creates hard links to unchanged files to save space. Which tool and option combination is most appropriate?

Accepted Answer

rsync -a --link-dest=/previous/backup /source /current/backup. Option A is correct. rsync with --link-dest creates hard links to unchanged files, enabling incremental backups. Option B copies with hard links but not incremental. Option C does not handle incremental hard links. Option D is for disk cloning.

Answer

dd if=/source of=/destination conv=sync

Answer

cp -al /source /destination

Answer

tar --hard-link --create /source > /destination/backup.tar

Question 4

An administrator runs 'systemctl list-units' and sees that httpd.service is in a failed state. To quickly see the error message that caused the failure, which command should be used?

Accepted Answer

systemctl status httpd.service. Option B is correct. systemctl status displays the unit's state and recent journal entries showing the error. Option A filters errors but may not show the immediate failure cause as concisely. Option C shows properties. Option D analyzes boot time.

Answer

systemctl show httpd.service -p ExecMainStatus

Answer

journalctl -p err -u httpd.service

Answer

systemd-analyze blame

Question 5

An administrator is troubleshooting a server that is experiencing intermittent high load. The administrator wants to identify processes that are using excessive CPU. Which two of the following commands can provide real-time CPU usage per process? (Choose two.)

Accepted Answer

htop. top and htop provide real-time, dynamic views of process CPU usage. ps provides a static snapshot, iostat monitors I/O, and vmstat shows system-wide statistics.

Answer

iostat

Answer

ps -aux

Answer

vmstat

Question 6

An administrator is managing a server using systemd and needs to control services and units. Which THREE of the following are valid systemd commands for service management? (Choose three.)

Accepted Answer

systemctl mask. Systemctl is the primary systemd command; start, enable, and mask are valid subcommands. Service and chkconfig are legacy SysVinit commands.

Answer

service start

Answer

chkconfig on

Question 7

A technician needs to identify the network interface configuration and IP address of a system. Which command provides the most comprehensive output for this task?

Accepted Answer

ip addr show. Option D is correct because `ip addr show` displays all network interfaces with their IP addresses, MAC addresses, and state. Option A is wrong because `ifconfig` is deprecated and may not show all interfaces. Option B is wrong because `netstat -i` shows interface statistics but not IP addresses. Option C is wrong because `nmcli dev show` shows device details but requires NetworkManager. Option E is wrong because `hostname -I` shows only IP addresses without interface details.

Answer

nmcli dev show

Answer

netstat -i

Answer

ifconfig

Answer

hostname -I

Question 8

A Linux server is experiencing slow boot times. The administrator wants to identify which systemd services are taking the longest to start. Which command should be used?

Accepted Answer

systemd-analyze blame. Option D is correct. systemd-analyze blame lists services and their start times, sorted by time. Option A shows a summary of boot time breakdown. Option B lists units but not start times. Option C shows kernel and initrd time.

Answer

systemd-analyze time

Answer

journalctl -b -p 3

Answer

systemctl list-units --all

Question 9

An administrator needs to set up a new LVM volume. Which two commands are necessary in the initial setup before creating a logical volume?

Accepted Answer

vgcreate. Options A and B are correct. pvcreate initializes a physical volume, and vgcreate creates a volume group. lvcreate is used after these steps to create the logical volume. mkfs and mount are filesystem operations after the logical volume is created.

Answer

mount

Answer

lvcreate

Answer

mkfs

Question 10

A Linux administrator needs to mount a new ext4 filesystem on /dev/sdb1 to /mnt/data. The administrator wants the filesystem to be mounted automatically at boot with noatime and with user ownership of files to be preserved (i.e., the filesystem should be owned by a specific user). Which line should be added to /etc/fstab?

Accepted Answer

/dev/sdb1 /mnt/data ext4 defaults,noatime 0 2. For ext4, the uid mount option does not exist; ownership is based on the files themselves. The default mount options are specified by 'defaults', which includes rw, suid, dev, exec, auto, nouser, async, and relatime. Adding 'noatime' replaces relatime. A typical /etc/fstab entry for a data filesystem uses 'defaults,noatime' and pass number 2 for non-root filesystems. Option B uses uid which is invalid for ext4. Option C uses rw but pass 0 prevents fsck. Option D uses user which allows non-root users to mount.

Answer

LABEL=DATA /mnt/data ext4 noatime,user 0 2

Answer

UUID=xxxx /mnt/data ext4 defaults,noatime,uid=1000 0 2

Answer

/dev/sdb1 /mnt/data ext4 rw,noatime 0 0

Question 11

A system administrator is configuring a firewall using iptables. The requirement is to allow incoming SSH connections from the 192.168.1.0/24 network only. Which iptables rule should be added to the INPUT chain?

Accepted Answer

iptables -A INPUT -p tcp --dport 22 -s 192.168.1.0/24 -j ACCEPT. Option A is correct because it specifies the source IP range, destination port 22, and accepts the connection. Option B is wrong because it refers to the output interface. Option C is wrong because it uses REJECT instead of DROP, but more importantly, it doesn't specify source. Option D is wrong because it only logs and does not accept. Option E is wrong because -s is missing, so it accepts from any source.

Answer

iptables -A INPUT -p tcp --dport 22 -d 192.168.1.0/24 -j ACCEPT

Answer

iptables -A INPUT -p tcp --dport 22 -s 192.168.1.0/24 -j REJECT

Answer

iptables -A INPUT -p tcp --dport 22 -s 192.168.1.0/24 -j LOG

Answer

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

Question 12

An administrator is troubleshooting a web server that is running under SELinux enforcing mode. The web content is located in a non-standard directory /webfiles. Using the standard SELinux context 'httpd_sys_content_t', the files are still inaccessible. Which command will properly set the context recursively and persist across relabels?

Accepted Answer

semanage fcontext -a -t httpd_sys_content_t '/webfiles(/.*)?' ; restorecon -Rv /webfiles. Option C is correct. semanage fcontext adds a rule to the file context database, and restorecon applies it. Option A uses chcon which does not survive relabel. Option B disables SELinux. Option D only works if a rule already exists.

Answer

chcon -R -t httpd_sys_content_t /webfiles

Answer

setenforce 0

Answer

restorecon -Rv /webfiles

Question 13

The /home partition is nearly full. The administrator wants to increase the size of the home filesystem. Which action should be taken first?

Accepted Answer

Unmount the /home filesystem. Option C is correct. For safety, the filesystem should be unmounted before extending the logical volume and resizing the filesystem. Option A and B are steps after unmounting. Option D is unnecessary unless there is no free space in the volume group.

Answer

Use resize2fs on /dev/mapper/vg-home

Answer

Use lvextend to extend the logical volume

Answer

Add a new disk to the volume group

Question 14

A Linux administrator needs to check which process is using the most memory on a system. The administrator wants to view dynamically updating list of processes sorted by memory usage. Which command should the administrator use?

Accepted Answer

top -o %MEM. The top command provides a real-time, dynamically updating view of system processes. Using the -o %MEM flag sorts processes by memory usage. Option A (ps) shows a static snapshot. Option C (htop) is not installed by default on many systems and uses -s for sort. Option D (vmstat) shows system-wide stats, not per process.

Answer

ps aux --sort=-%mem

Answer

htop -s MEM

Answer

vmstat 1 5

Question 15

A junior administrator needs to monitor system resource usage on a production server. Which TWO commands should the administrator use to check CPU and memory utilization in real-time? (Choose two.)

Accepted Answer

top. Top provides real-time CPU, memory, and process information. Free shows memory usage. Df checks disk space, lsof lists open files, and uptime shows system load but not resource utilization in real-time.

Answer

df

Answer

uptime

Answer

lsof

XK0-005 Practice Test 24 — 15 Questions

Exhibit

XK0-005 Practice Test 24 — 15 Questions

Exhibit