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NEW QUESTION 781
An administrator found a suspicious public IP address in a log file. Which of the following commands can be used with the IP address to resolve back to a domain? (Choose two).
A. dig -x
B. dig
C. whois
D. nslookup
E. traceroute -n
F. hostname
Answer: AD
NEW QUESTION 782
A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes. Which of the following commands will accomplish this task?
A. ssh-keygen -RPb 4096
B. ssh-keygen -t rsa -b 4096
C. ssh-keygen -k rsa -l 4096 -p
D. ssh-keygen -t dsa -B 4096
Answer: B
NEW QUESTION 783
A systems administrator needs to stop a running systemd service tor and prevent it from running when the system starts up. Which of the following is the best command for the administrator to use to accomplish this task?
A. pidof -o %PPID -x tor && apt -y purge tor
B. pkill tor
C. service stop|disable tor
D. systemctl stop tor && systemctl disable tor
Answer: D
NEW QUESTION 784
A Linux administrator edits a file that a system uses during the startup process to mount all the required partitions and volumes. The administrator wants to ensure no errors are in the file and the system will restart properly. Which of the following commands should the administrator use?
A. fsadm -v
B. mount -a
C. fsck -N
D. mountpoint -d
Answer: B
NEW QUESTION 785
A systems administrator received a request to enable secure web services and SSH at the firewall level. Which of the following should the administrator use to accomplish this task? (Choose two.)
A. sudo ufw allow https
B. sudo ufw allow 22/udp
C. sudo ufw allow 8080/tcp
D. sudo ufw allow 22/tcp
E. sudo ufw allow http
F. sudo ufw allow 80/tcp
Answer: AD
NEW QUESTION 786
A systems administrator issued the dm-crypt command with no parameters. Which of the following cryptographic features is the systems administrator trying to use?
A. LUKS
B. HMAC
C. SHA-256
D. MD5
Answer: A
NEW QUESTION 787
A Linux administrator is removing non-permanent rules from the system firewall. Which of the following commands will allow the administrator to achieve this goal in the safest way possible?
A. firewall-cmd –set-default-zone
B. firewall-cmd –runtime-to-permanent
C. firewall-cmd –reload
D. firewall-cmd –complete-reload
Answer: C
Explanation:
firewall-cmd –runtime-to-permanent sets the current rules to permanent, it doesn’t remove non-permanent rules. –reload will reload the firewall config and remove any non-persistent rules that were added during the current session.
NEW QUESTION 788
A technician wants to temporarily use a Linux virtual machine as a router for the network segment 10.10.204.0/24. Which of the following commands should the technician issue? (Choose three.)
A. echo “1” > /proc/sys/net/ipv4/ip_forward
B. iptables -A FORWARD -j ACCEPT
C. iptables -A PREROUTING -j ACCEPT
D. iptables -t nat -s 10.10.204.0/24 -p tcp -A PREROUTING -j MASQUERADE
E. echo “0”> /proc/sys/net/ipv4/ip_forward
F. echo “1” > /proc/net/tcp
G. iptables -t nat -s 10.10.204.0/24 – A POSTROUTING -j MASQUERADE
H. iptables -t nat -A PREROUTING -j MASQUERADE
Answer: ABG
NEW QUESTION 789
An administrator needs to restrict a file’s permission set in the following ways:
– The file needs to be read and write, but it should not be executable to the file owner.
– The file needs to be read only and executable to the group owner.
– The file needs to be read only to all other users.
Which of the following represents the next command the administrator should execute?
A. chmod 210 file.txt
B. chmod 654 file.txt
C. chmod 753 file.txt
D. chmod 777 file.txt
Answer: B
NEW QUESTION 790
A systems technician needs to install a third-party software package. Which of the following commands would allow the technician to download this software package from a remote server?
A. netstat
B. nc
C. telnet
D. wget
Answer: D
NEW QUESTION 791
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
[email protected]: Permission denied (publickey,password)
After seeing the message, the administrator attempts to connect using ssh -v [email protected] and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm
Which of the following actions should the administrator take first to remediate this issue?
A. Issue systemctl restart sshd on the local server.
B. Create a new key pair by running ssh-keygen -t ecdsa.
C. Set PermitRootLogin yes in the /etc/ssh/sshd_config file.
D. Update permissions on the /home/admin/.ssh directory to 700 on the remote server.
Answer: B
Explanation:
The “no mutual signature algorithm” error means the RSA/SHA-1 key type (ssh-rsa) isn’t supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh-keygen -t ecdsa) ensures a mutually supported signature method.
NEW QUESTION 792
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?
A. sudo ufw allow from 10.10.0.0/24 to any port 22
B. sudo ufw allow in on eth0 to any port 22
C. sudo ufw allow from 10.10.0.0/24
D. sudo ufw allow 0:22/tcp from 10.10.0.0
Answer: A
Explanation:
The command sudo ufw allow from 10.10.0.0/24 to any port 22 explicitly opens TCP port 22 (used by SFTP/SSH) only for hosts in the 10.10.0.0/24 network.
NEW QUESTION 793
A user sends a request to access a virtual server via SSH. Which of the following commands is used to open the SSH standard port?
A. firewalld-cmd –permanent –add-port=22/tcp
B. iptables-save | grep dport-22/tcp
C. iptables -A INPUT -p tcp –dport sshd -j ACCEPT
D. firewalld-cmd –remove-service=ssh –permanent
Answer: A
Explanation:
The firewalld-cmd –permanent –add-port=22/tcp command (commonly firewall-cmd) opens TCP port 22 in the permanent firewalld ruleset so that SSH traffic is allowed. After running it, you’d issue firewall-cmd –reload to apply the change.
NEW QUESTION 794
A Linux systems administrator is resolving a privileged access issue for users who are members of an admin group. Which of the following configuration files should the administrator update so the users in the admin group will have root privileged access to the Linux system?
A. /etc/sudoers
B. /etc/login.defs
C. /etc/group
D. /etc/shadow
Answer: A
Explanation:
The /etc/sudoers file controls which users and groups can elevate privileges via sudo. By adding a line such as %admin ALL=(ALL) ALL to /etc/sudoers, members of the admin group gain root-level access.
NEW QUESTION 795
An administrator thinks that the user Joe may be running an unauthorized process on a Linux server. Which of the following commands should the administrator run to confirm this idea?
A. lsof -p ‘Joe’
B. top -u ‘Joe’
C. jobs -n ‘Joe’
D. ps -ax ‘Joe’
Answer: B
Explanation:
top -u Joe filters the process display to only show processes owned by user Joe, allowing the administrator to see if Joe is running any unauthorized processes.
NEW QUESTION 796
After system startup, the X Window System GUI login interface is not displaying. Which of the following commands ensures that the GUI is started during the system startup process?
A. systemctl isolate graphical.target
B. systemctl unmask xwindow.service
C. systemctl enable xwindow.service
D. systemctl set-default graphical.target
Answer: D
Explanation:
Setting the default target to graphical.target tells systemd to boot into the graphical interface on startup. The command systemctl set-default graphical.target makes the GUI login display automatically at boot.
NEW QUESTION 797
A systems administrator needs to validate that the dm_multipath driver was loaded in a Linux system. Which of the following commands should the administrator use?
A. lsmod | grep dm_multipath
B. modinfo | grep dm_multipath
C. insmod | grep dm_multipath
D. modprobe | grep dm_multipath
Answer: A
Explanation:
lsmod lists currently loaded kernel modules; piping to grep dm_multipath confirms whether that specific driver is active in the running kernel.
NEW QUESTION 798
Which of the following actions is required to establish passwordless SSH authentication?
A. Copy the private SSH key to the remote server.
B. Copy the public and private keys to the remote server.
C. Generate public and private keys on the remote server.
D. Copy the public SSH key to the remote server.
Answer: D
Explanation:
Copying the public SSH key to the remote server’s authorized_keys file is all that’s needed to enable passwordless SSH authentication.
NEW QUESTION 799
A Linux server is not starting up because files in the /boot/ partition are corrupt. After the initial GRUB screen, the following message is displayed:
Probing EDD (edd=off to disable)… ok
uncompression error
–system halted
Which of the following steps should the Linux administrator take to recover the system without destroying the existing installation? (Choose two.)
A. Replace the hard drive.
B. Increase the amount of swap memory.
C. Start up in single-user mode.
D. Start up the system using rescue boot media.
E. Reinstall the kernel packages.
F. Reinstall the OS.
Answer: DE
Explanation:
– Using rescue boot media lets you boot the machine, mount the existing partitions, and access the corrupted /boot files without reinstalling the OS.
– Reinstalling the kernel packages restores the missing or corrupt files in /boot (e.g., vmlinuz and initramfs), allowing GRUB to load and uncompress the kernel properly.
NEW QUESTION 800
A Linux administrator needs to deploy an Apache web server in a container. In addition, the container needs to run in the background, and the web server needs to be exposed on port 8080 of the host machine. Which of the following commands will satisfy these requirements?
A. sudo docker run -b -t -p 8080:80 –name mywebserver httpd
B. sudo docker run -d -t -p 8080:80 –name myweb httpd
C. sudo docker run -d -t -p 80:8080 –name myweb httpd
D. sudo docker run -b -t -p 80:8080 –name mywebserver httpd
Answer: B
Explanation:
To deploy an Apache web server (httpd) in a Docker container, ensuring it runs in the background and exposes port 8080 on the host machine, the correct command should include:
1. docker run – Creates and starts a new container.
2. -d – Runs the container in detached mode (background).
3. -t – Allocates a pseudo-TTY, useful for interactive processes (though not strictly required here).
4. -p 8080:80 – Maps port 8080 on the host to port 80 inside the container, where the Apache web server listens.
5. –name myweb – Names the container myweb for easy reference.
6. httpd – Uses the official Apache HTTP Server Docker image.
NEW QUESTION 801
An organization’s business office needs to collaborate on quarterly reports and asks the systems administrator to create a finance group. The administrator creates the following directory:
drwxrwxr-x business business 4096 Oct 15 16:40 q1
Which of the following commands will allow all members of the finance group to have group ownership of all files created in the q1 directory while ensuring that members of the business group preserve access? (Choose two.)
A. chgrp finance q1/
B. chmod g+s q1/
C. chmod u+s q1/
D. chmod a+x q1/
E. chown finance q1/
F. chmod g+x q1/
Answer: AB
NEW QUESTION 802
Which of the following options represents disk mirroring?
A. RAID 0
B. RAID 1
C. RAID 5
D. RAID 6
Answer: B
Explanation:
RAID 1, also known as disk mirroring, duplicates data across two or more disks. This ensures redundancy, meaning if one disk fails, the data remains intact on the other disk(s). RAID 1 provides high fault tolerance but does not improve write performance or increase storage capacity.
NEW QUESTION 803
A Linux administrator needs to restart a server and wants to see if any users are currently connected to it. Which of the following commands should the administrator run to find this information?
A. man
B. id
C. w
D. host
Answer: C
NEW QUESTION 804
An administrator wants to copy files from /opt/tools to the home directory at /home/admin. Which of the following should the administrator run?
A. mkdir -p /home/admin/tools
B. cp -R /opt/tools ~
C. cd /opt/tools; rsync /home/admin
D. scp /opt/tools localhost:/
Answer: B
NEW QUESTION 805
A Linux administrator discovers that a configured schedule is not running properly and needs to re- create the schedule. The task should run every Monday at 13:30 but only during the months of February, May, August, and November. Which of the following options should the administrator use?
A. OnCalendar=Mon *-2,5,8,11-* 13:30:00
B. OnCalendar=*-FEB,*-MAY,*-AUG,*-N0V Mon 13:30:00
C. OnCalendar=*-*-2,5,8,11 13:30:00 Mon
D. OnCalendar=Mon *-FEB *-MAY *-AUG *-NOV 13:30:00
Answer: A
Explanation:
It uses the systemd OnCalendar syntax Mon *-2,5,8,11-* 13:30:00, which translates to “every Monday in months 2, 5, 8, and 11 at 13:30”. The other choices either misplace the month list, use invalid comma/dash placement, or repeat the calendar fields incorrectly.
NEW QUESTION 806
A systems administrator needs to install the file installer_0.17-41.2_amd64.deb. Which of the following commands should the administrator use?
A. apt install installer
B. dpkg -i installer_0.17-41.2_amd64.deb
C. rpm -i installer_0.17-41.2_amd64.deb
D. yum localinstall installer_0.17-41.2_amd64.deb
Answer: B
Explanation:
The dpkg -i installer_0.17-41.2_amd64.deb command installs a local Debian package file; rpm/yum are for RPM packages and apt install installer installs from repositories, not a specific .deb file.
NEW QUESTION 807
A Linux administrator needs to check the content of a log file that is appending data as the file grows. Which of the following commands should the administrator use to accomplish this task?
A. tail -f log.txt
B. tail -v log.txt
C. tail -c log.txt
D. tail log.txt
Answer: A
NEW QUESTION 808
A systems administrator just downloaded a source code package with the file extension TGZ. Which of the following commands would decompress and unarchive the package?
A. tar -xf
B. tar -zcvpf
C. tar -xvf
D. tar -zxvf
Answer: D
NEW QUESTION 809
A Linux administrator would like to run the cleanup script /home/admin/script.sh at 9:00 p.m. on March 31. Which of the following commands should the administrator use to accomplish this task?
A. at -f /home/admin/script.sh 9pm March 31
B. echo < /home/admin/script.sh | at 9pm March 31
C. at 9pm March 31 | echo > /home/admin/script.sh
D. at 9pm March 31 -f /home/admin/script.sh
Answer: B
NEW QUESTION 810
A Linux administrator is updating the password for the logcollect account. The administrator issues the following commands:
#passwd -l logcollect
#passwd logcollect
The administrator receives a message that the password cannot be modified. Which of the following is most likely the issue?
A. The logcollect account needs to be unlocked.
B. The logcollect account is managed by an LDAP provider.
C. The logcollect account must set the password.
D. The logcollect account is configured for nologin.
Answer: A
NEW QUESTION 811
Which of the following best describes JSON?
A. A programming language that developers use to build dynamic websites.
B. An open-source platform that facilitates the creation and administration of isolated environments.
C. A file format for exchanging information or data between systems.
D. A software-based technique that allows a computer to simulate one or more machines so they appear to be real.
Answer: C
NEW QUESTION 812
……
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