An administrator changed the default port of an SSH server to 2222 on myhost, and clients are not able to connect. The administrator runs some commands and receives the following output:vbnetCopy code$ ssh -p 2222 myhostssh:connect to host myhost on port 2222: No route to hostWhich of the following commands should be run on myhost?

firewall-cmd --zone=public --add-port=2222

firewall-cmd --zone=public --add-service=ssh

firewall-cmd --zone=public --add-port=2222

iptables --zone=public --add-service=ssh

iptables --zone=public --add-port=2222

A Linux administrator is investigating the reason a systemd timer is not running every night at midnight. The administrator sees the following unit file:[Unit]Description=Execute backup every day at midnight[Timer]OnCalendar=--01 00:00:00Unit=backup.serviceRandomizedDelaySec=10800[Install]WantedBy=multi-user.targetWhich of the following modifications should the administrator make in the unit file? (Select two).

Remove RandomizedDelaySec=10800.

Remove OnCalendar=--01 00:00:00.

A Linux systems administrator needs to compress a file named passwords.txt. The compressed file should be saved as passwords.txt.gz. Which of the following commands should the administrator use to accomplish this task?

gzip -c passwords.txt > passwords.txt.gz

gzip -d passwords.txt | passwords.txt.gz

gzip -n passwords.txt > passwords.txt.gz

gzip -n passwords.txt < passwords.txt.gz

Users are reporting that a Linux server is responding slowly. A systems administrator troubleshooting the server issue sees the following iostat output, with %iowait at 50.38. Which of the following is most likely the issue?

The CPU is mostly waiting for I/O operations.

/ filesystem does not have enough storage allocated.

/var filesystem is almost full.

The CPU capacity is inadequate.

A Linux engineer wants to give read-write-execute permissions for the cloud_users directory to user Oliver. Which of the following commands should the engineer use?

setfacl -m u:Oliver /cloud_users

A Linux administrator is creating a user that can run the FTP service but cannot log in to the system. The administrator sets /bin/false as a login shell for the user. When the user tries to run the FTP service, it is rejected with an 'invalid shell: /bin/false' message. Which of the following is the best way to resolve the issue?

Add /bin/false entry to the /etc/shells file

Change ownership of /bin/false to the FTP user

Add /bin/false entry to the /etc/shells file

Make /bin/false an executable file

Change the user's default shell to /bin/bash

A Linux administrator needs to harden a system and guarantee that the Postfix service will not run, even after a restart or system upgrade. Which of the following commands allows the administrator to fulfill the requirement?

systemctl disable postfix.service

systemctl -n restart postfix.service

A systems administrator is receiving complaints about slow performance and system crashes. The administrator suspects memory and CPU issues. Which of the following is the first action the administrator should take to troubleshoot and resolve these issues?

Run resource monitoring tools like top or htop to view the current CPU and memory use.

Look through the system logs and error messages to find any faults involving the CPU and memory.

Remove and replace the CPU and memory components to address hardware issues.

Reboot the server to clear any CPU and memory congestion.

Users are reporting that a Linux server is responding slowly. A systems administrator troubleshooting the server issue sees the following:# iostat -m 2Linux 3.10.0-1160.66.1.el7.x86_64 (myhost) 10/19/2022 x86_64 (4 CPU)avg-cpu: %user %nice %system %iowait %steal %idle24.30 0.01 0.29 50.38 4.00 19.01Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtnsdd 15.65 0.48 0.83 4936250 8513501# df -hFilesystem Size Used Avail Use% Mounted ondevtmpfs 16G 0 16G 0% /devtmpfs 16G 64K 16G 1% /dev/shm/dev/mapper/root 35G 8.8G 26G 26% //dev/sda2 497M 144M 354M 29% /boot/dev/mapper/tmp 10G 38M 10G 1% /tmp/dev/mapper/var 15G 13G 2.2G 86% /var/dev/mapper/varlib 650G 397G 254G 62% /var/lib/dev/mapper/varlog 15G 9.5G 5.5G 64% /var/log/dev/mapper/varaudit 15G 72M 15G 1% /var/log/auditWhich of the following is most likely the issue?

The CPU is mostly waiting for I/O operations.

/ filesystem does not have enough storage allocated.

/var filesystem is almost full.

The CPU capacity is inadequate.

The journald entries have filled a Linux machine's /var volume. Which of the following is the best command for a systems administrator to use to free up the disk space occupied by these entries?

journalctl --rotate journalctl --vacuum-time=1s

systemctl stop systemd-journald systemctl start systemd-journald

rm -rf /var/log/journal systemctl restart systemd-journald

pkill -HUP systemd-journald systemctl restart systemd-journald

Users report that they cannot access some files located in the /opt/finapp directory after a power outage caused an unexpected server restart. A Linux administrator examines the following filesystem details and system logs:# mount | grep finapp/dev/mapper/rhel-opt_finapp on /opt/finapp type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsda 8:0 0 931.5G 0 disksda1 8:1 0 1G 0 part /bootsda2 8:2 0 930.5G 0 partrhel-root 253:0 0 30.5G 0 lvm /rhel-opt_finapp 253:1 0 900G 0 lvm /opt/finapp# grep opt_finapp /var/log/messagesXFS (opt_finapp): Corruption detected in inode 3645, extent treeWhich of the following commands should the administrator run in an attempt to fix the filesystem?

xfs_repair /dev/mapper/rhel-opt_finapp

fdisk /dev/mapper/rhel-opt_finapp

xfs_repair /dev/mapper/rhel-opt_finapp

lvcreate -L900G -n opt_finapp rhel

fsck.ext4 /dev/mapper/rhel-opt_finapp

A newly hired junior administrator is studying the format of the /var/log/messages file. Which of the following commands should the administrator use to preserve the contents of the original file while also creating an identical file in the /home/admin directory?

cat /var/log/messages > /home/admin/messages

touch /var/log/messages /home/admin

mv /var/log/messages /home/admin

cat /var/log/messages > /home/admin/messages

ln -s /var/log/messages /home/admin

A Linux administrator is creating a directory called CompTIA_doc and needs to switch to another location to perform some system-related tasks. Which of the following commands should the administrator use for this task?

mkdir CompTIA_doc && cd CompTIA_doc

mkdir CompTIA doc & cd CompTIA doc

mkdir CompTIA_doc > cd CompTIA_doc

mkdir CompTIA_doc || cd CompTIA_doc

mkdir CompTIA_doc && cd CompTIA_doc

A Linux administrator is configuring crontab and needs to schedule a task to run only on Saturday and Sunday at 9:00 a.m. every week of the year. Which of the following should the administrator use?

0 9 * * 6,0 root /root/script.sh

0 9 * * 1-5 root /root/script.sh

0 9 1 */3 * root /root/script.sh

0 9 * * 6,0 root /root/script.sh

A new hard drive /dev/sdd was added to a server. Which of the following commands will create a partition table with a single partition /dev/sdd1 that consumes the entire disk?

echo 'type=83' | sudo sfdisk /dev/sdd

echo 'auto' | sudo fdisk /dev/sdd

A Linux administrator is creating a directory called CompTIA_doc, and it needs to switch to another location to perform some system-related tasks. Which of the following commands should the administrator use for this task?

mkdir CompTIA_doc && cd CompTIA_doc

mkdir CompTIA_doc & cd CompTIA_doc

mkdir CompTIA_doc + cd CompTIA_doc

mkdir CompTIA_doc || cd CompTIA_doc

mkdir CompTIA_doc && cd CompTIA_doc

Users report that they cannot access some files located in the /opt/finapp directory after a power outage caused an unexpected server restart. A Linux administrator examines the following filesystem details and system logs:# mount | grep finapp/dev/mapper/rhel-opt_finapp on /opt/finapp type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsda 8:0 0 931.5G 0 disk|-sda1 8:1 0 1G 0 part /boot|-sda2 8:2 0 930.5G 0 part|-rhel-root 253:0 0 30.5G 0 lvm /|-rhel-opt_finapp 253:1 0 900G 0 lvm /opt/finapp# grep opt_finapp /var/log/messagesXFS (opt_finapp): Corruption detected in inode 3645, extent treeWhich of the following commands should the administrator run in an attempt to fix the filesystem?

xfs_repair /dev/mapper/rhel-opt_finapp

fdisk /dev/mapper/rhel-opt_finapp

xfs_repair /dev/mapper/rhel-opt_finapp

lvcreate -L900G -n opt_finapp rhel

fsck.ext4 /dev/mapper/rhel-opt_finapp

A systems administrator is working on an SFTP server configuration. Which of the following commands will best enable the connectivity to that service from the 10.10.0.0/24 network?

sudo ufw allow from 10.10.0.0/24 to any port 22

sudo ufw allow in on eth0 to any port 22

sudo ufw allow from 10.10.0.0/24

sudo ufw allow 0:22/tcp from 10.10.0.0

An administrator needs to allow remote administrative access to a Linux server only to employees who are using the authorized private key. Which of the following options should the administrator set in the SSHD configuration file to achieve the goal?

PermitRootLogin prohibit-password

A hardened physical Linux system allows regular, unprivileged users to remotely connect to the server using SSH only. No sudo tool has been installed. Which of the following should the Linux administrator use to perform administrative tasks on this host? (Select two).

Access the server's physical console and use the root user's password to log in.

Use the su command and enter the root user's password.

Create an SSH key and copy it to the remote server to allow passwordless log-in.

Access the server's physical console and use the root user's password to log in.

Install the telnet server on this system to be able to use a root account.

Use the su command and enter the root user's password.

Install the sudo command using the unprivileged user's account.

Add the user to the wheel group.

A systems administrator needs to install the file installer_0.17-41.2_amd64.deb. Which of the following commands should the administrator use?

dpkg -i installer_0.17-41.2_amd64.deb

rpm -i installer_0.17-41.2_amd64.deb

yum localinstall installer_0.17-41.2_amd64.deb

Users report that they are unable to reach the company website https://www.comptia.org. A systems administrator confirms the issue with the following command:# curl https://www.comptia.orgcurl: (7) Failed to connect to www.comptia.org port 443: No route to hostThe administrator logs in to the company's web server to check its configuration and sees the following output:root@comptia.org:-># firewall-cmd --list-allpublic (active)target: defaulticmp-block-inversion: nointerfaces: dummy0 eth0sources:services: cockpit dhcpv6-client http sshports: 3001/tcpprotocols:forward: nomasquerade: noforward-ports:source-ports:icmp-blocks:rich rules:rule family='ipv4' source address='61.177.173.6' port port='ssh' protocol='tcp' reject type='icmp-port-unreachable'rule family='ipv4' source address='185.143.45.164' port port='ssh' protocol='tcp' reject type='icmp-port-unreachable'rule family='ipv4' source address='143.198.60.41' port port='ssh' protocol='tcp' reject type='icmp-port-unreachable'root@comptia.org:-># ip routedefault via 172.31.1.1 dev eth0 proto dhcp src 65.21.187.65 metric 10010.0.6.0/24 dev dummy0 proto kernel scope link src 10.0.6.65 metric 550172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1172.18.0.0/16 dev br-28ac2eaeeca1 proto kernel scope link src 172.18.0.1172.19.0.0/16 dev br-fb3897555ca3 proto kernel scope link src 172.19.0.1 linkdown172.31.1.1 dev eth0 proto dhcp scope link src 65.21.187.65 metric 100192.168.224.0/20 dev br-e949ab177d79 proto kernel scope link src 192.168.224.1 linkdown192.168.240.0/20 dev br-6adf72ac0ae3 proto kernel scope link src 192.168.240.1 linkdownWhich of the following is causing the issue?

HTTPS traffic is not allowed through the web server firewall.

The web server's interface has no link.

The default route on the web server is incorrect.

HTTPS traffic is not allowed through the web server firewall.

User IP addresses are rejected by the firewall.

CompTIA XK0-005 Practice Test 10 - Free Online Exam Prep & Questions

A Linux administrator is enabling root log-in over SSH on a server. Which of the following combinations of files and parameters should the administrator modify to accomplish this task?

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CompTIA XK0-005 Practice Test 10

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