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CompTIA XK0-004 Exam Syllabus Topics:

Topic	Details
Hardware and System Configuration - 21%
Explain Linux boot process concepts.	1.Boot loaders GRUB GRUB2 2.Boot options UEFI/EFI PXE NFS Boot from ISO Boot from HTTP/FTP 2.File locations /etc/default/grub /etc/grub2.cfg /boot /boot/grub /boot/grub2 /boot/ef 3.Boot modules and files Commands mkinitrd dracut grub2-install grub2-mkconfig initramfs efi files vmlinuz vmlinux 4.Kernel panic
Given a scenario, install, configure, and monitor kernel modules.	1.Commands lsmod insmod modprobe modinfo dmesg rmmod depmod 2.Locations /usr/lib/modules/[kernelversion] /usr/lib/modules /etc/modprobe.conf /etc/modprobe.d/
Given a scenario, configure and verify network connection parameters.	1.Diagnostic tools ping netstat nslookup dig host route ip ethtool ss iwconfig nmcli brctl nmtui 2.Configuration files /etc/sysconfig/network-scripts/ /etc/sysconfig/network /etc/hosts /etc/network /etc/nsswitch.conf /etc/resolv.conf /etc/netplan /etc/sysctl.conf /etc/dhcp/dhclient.conf 3.Bonding Aggregation Active/passive Load balancing
Given a scenario, manage storage in a Linux environment.	1.Basic partitions Raw devices GPT MBR 2.File system hierarchy Real file systems Virtual file systems Relative paths Absolute paths 3.Device mapper LVM mdadm Multipath 4.Tools XFS tools LVM tools EXT tools Commands mdadm fdisk parted mkfs iostat df du mount umount lsblk blkid dumpe2fs resize2fs fsck tune2fs e2label 5.Location /etc/fstab /etc/crypttab /dev/ /dev/mapper /dev/disk/by- id uuid path multipath /etc/mtab /sys/block /proc/partitions /proc/mounts 6.File system types ext3 ext4 xfs nfs smb cifs ntfs
Compare and contrast cloud and virtualization concepts and technologies.	1.Templates VM OVA OVF JSON YAML Container images 2.Bootstrapping Cloud-init Anaconda Kickstart 3.Storage Thin vs. thick provisioning Persistent volumes Blob Block 4.Network considerations Bridging Overlay networks NAT Local Dual-homed 5.Types of hypervisors 6.Tools libvirt virsh vmm
Given a scenario, configure localization options.	1.File locations /etc/timezone /usr/share/zoneinfo 2.Commands localectl timedatectl date hwclock 3.Environment variables LC_* LC_ALL LANG TZ 4.Character sets UTF-8 ASCII Unicode
Systems Operation and Maintenance - 26%
Given a scenario, conduct software installations, configurations, updates, and removals.	1.Package types .rpm .deb .tar .tgz .gz 2.Installation tools RPM Dpkg APT YUM DNF Zypper 3.Build tools Commands make make install ldd Compilers Shared libraries 4.Repositories Configuration Creation Syncing Locations 5.Acquisition commands wget curl
Given a scenario, manage users and groups.	1.Creation useradd groupadd 2.Modification usermod groupmod passwd chage 3.Deletion userdel groupdel 4.Queries id whoami who w last 5.Quotas User quota Group quota 6.Profiles Bash parameters User entries - .bashrc - .bash_profile - .profile Global entries /etc/bashrc /etc/profile.d/ /etc/skel /etc/profile 7.Important files and file contents /etc/passwd /etc/group /etc/shadow
Given a scenario, create, modify, and redirect files.	1.Text editors nano vi 2.File readers grep cat tail head less more 3.Output redirection < > \| << >> 2> &> stdin stdout stderr /dev/null /dev/tty xargs tee Here documents 4.Text processing grep tr echo sort awk sed cut printf egrep wc paste 5.File and directory operations touch mv cp rm scp ls rsync mkdir rmdir ln Symbolic (soft) Hard unlink inodes find locate grep which whereis diff updatedb
Given a scenario, manage services.	1.Systemd management Systemctl Enabled Disabled Start Stop Mask Restart Status Daemon-reload Systemd-analyze blame Unit files Directory locations Environment parameters Targets Hostnamectl Automount 2.SysVinit chkconfig on off level Runlevels Definitions of 0–6 /etc/init.d /etc/rc.d /etc/rc.local /etc/inittab Commands -runlevel -telinit Service Restart Status Stop Start Reload
Summarize and explain server roles.	1.NTP 2.SSH 3.Web 4.Certificate authority 5.Name server 6.DHCP 7.File servers 8.Authentication server 9.Proxy 10.Logging 11.Containers 12.VPN 13.Monitoring 14.Database 15.Print server 16.Mail server 17.Load balancer 18.Clustering
Given a scenario, automate and schedule jobs.	1.cron 2.at 3.crontab 4.fg 5.bg 6.& 7.kill 8.Ctrl+c 9.Ctrl+z 10.nohup
Explain the use and operation of Linux devices.	1.Types of devices Client devices Bluetooth WiFi USB Monitors GPIO Network adapters PCI HBA SATA SCSI Printers Video Audio 2.Monitoring and configuration tools lsdev lsusb lspci lsblk dmesg lpr lpq abrt CUPS udevadm add reload-rules control trigger 3.File locations /proc /sys /dev /dev/mapper /etc/X11 4.Hot pluggable devices /usr/lib/udev/rules.d (System rules - Lowest priority) /run/udev/rules.d (Volatile Rules) /etc/udev/rules.d (Local Administration - Highest priority) /etc/udev/rules.d
Compare and contrast Linux graphical user interfaces.	1.Servers Wayland X11 2.GUI Gnome Unity Cinnamon MATE KDE 3.Remote desktop VNC XRDP NX Spice 4.Console redirection SSH port forwarding Local Remote X11 forwarding VNC 5.Accessibility
Security - 19%
Given a scenario, apply or acquire the appropriate user and/or group permissions and ownership.	1.File and directory permissions Read, write, execute User, group, other SUID Octal notation umask Sticky bit SGID Inheritance Utilities chmod chown chgrp getfacl setfacl ls ulimit chage 2.Context-based permissions SELinux configurations disabled permissive enforcing SELinux policy targeted SELinux tools setenforce getenforce sestatus setsebool getsebool chcon restorecon ls -Z ps -Z AppArmor aa-disable aa-complain aa-unconfined /etc/apparmor.d/ /etc/apparmor.d/tunables 3.Privilege escalation su sudo wheel visudo sudoedit 4.User types Root Standard Service
Given a scenario, configure and implement appropriate access and authentication methods.	1.PAM Password policies LDAP integration User lockouts Required, optional, or sufficient /etc/pam.d/ pam_tally2 faillock 2.SSH ~/.ssh/ known_hosts authorized_keys config id_rsa id_rsa.pub User-specific access TCP wrappers /etc/ssh/ ssh_config sshd_config ssh-copy-id ssh-keygen ssh-add 3.TTYs /etc/securetty /dev/tty# 4.PTYs 5.PKI Self-signed Private keys Public keys Hashing Digital signatures Message digest 6.VPN as a client SSL/TLS Transport mode Tunnel mode IPSec DTLS
Summarize security best practices in a Linux environment.	1.Boot security Boot loader password UEFI/BIOS password 2.Additional authentication methods Multifactor authentication Tokens -Hardware -Software OTP Biometrics RADIUS TACACS+ LDAP Kerberos kinit klist 3.Importance of disabling root login via SSH 4.Password-less login Enforce use of PKI 5.Chroot jail services 6. No shared IDs 7.Importance of denying hosts 8.Separation of OS data from application data Disk partition to maximize system availability 9.Change default ports 10.Importance of disabling or uninstalling unused and unsecure services FTP Telnet Finger Sendmail Postfix 11.Importance of enabling SSL/TLS 12.Importance of enabling auditd 13.CVE monitoring 14.Discouraging use of USB devices 15.Disk encryption LUKS 16.Restrict cron access 17.Disable Ctrl+Alt+Del 18.Add banner 19.MOTD
Given a scenario, implement logging services.	1.Key file locations /var/log/secure /var/log/messages /var/log/[application] /var/log/kern.log 2.Log management Third-party agents logrotate /etc/rsyslog.conf journald journalctl 3.lastb
Given a scenario, implement and configure Linux firewalls.	1.Access control lists Source Destination Ports Protocol Logging Stateful vs. stateless Accept Reject Drop Log 2.Technologies firewalld Zones Run time iptables Persistency Chains ufw /etc/default/ufw /etc/ufw/ Netfilter 3.IP forwarding /proc/sys/net/ipv4/ip_forward /proc/sys/net/ipv6/conf/all/forwarding 4.Dynamic rule sets DenyHosts Fail2ban IPset 5.Common application firewall configurations /etc/services Privileged ports
Given a scenario, backup, restore, and compress files.	1.Archive and restore utilities tar cpio dd 2.Compression gzip xz bzip2 zip 3.Backup types Incremental Full Snapshot clones Differential Image 4.Off-site/off-system storage SFTP SCP rsync 5.Integrity checks MD5 SHA
Linux Troubleshooting and Diagnostics - 20%
Given a scenario, analyze system properties and remediate accordingly.	1.Network monitoring and configuration Latency Bandwidth Throughput Routing Saturation Packet drop Timeouts Name resolution Localhost vs. Unix socket Adapters RDMA drivers Interface configurations Commands nmap netstat iftop route iperf tcpdump ipset Wireshark - tshark netcat traceroute mtr arp nslookup dig host whois ping nmcli ip tracepath 2.Storage monitoring and configuration iostat ioping IO scheduling cfq noop deadline du df LVM tools fsck partprobe 3.CPU monitoring and configuration /proc/cpuinfo uptime loadaverage sar sysctl 4.Memory monitoring and configuration swapon swapoff mkswap vmstat Out of memory killer free /proc/meminfo Buffer cache output 5.Lost root password Single user mode
Given a scenario, analyze system processes in order to optimize performance.	1.Process management Process states Zombie Uninterruptible sleep Interruptible sleep Running Priorities Kill signals Commands nice renice top time ps lsof pgrep pkill PIDs
Given a scenario, analyze and troubleshoot user issues.	1.Permissions File Directory 2.Access Local Remote 3.Authentication Local External Policy violations 4.File creation Quotas Storage Inode exhaustion Immutable files 5.Insufficient privileges for authorization SELinux violations 6.Environment and shell issues
Given a scenario, analyze and troubleshoot application and hardware issues.	1.SELinux context violations 2.Storage Degraded storage Missing devices Missing volumes Missing mount point Performance issues Resource exhaustion Adapters SCSI RAID SATA HBA - /sys/class/scsi_host/host#/scan Storage integrity Bad blocks 3.Firewall Restrictive ACLs Blocked ports Blocked protocols 4.Permission Ownership Executables Inheritance Service accounts Group memberships 5.Dependencies Patching Update issues Versioning Libraries Environment variables GCC compatibility Repositories 6.Troubleshooting additional hardware issues Memory Printers Video GPU drivers Communications ports USB Keyboard mapping Hardware or softwarecompatibility issues Commands dmidecode lshw
Automation and Scripting - 14%
Given a scenario, deploy and execute basic BASH scripts.	1.Shell environments and shell variables PATH Global Local export env set printenv echo 2.#!/bin/bash 3.Sourcing scripts 4.Directory and file permissions chmod 5.Extensions 6.Commenting # 7.File globbing 8.Shell expansions ${} $() ` ` 8.Redirection and piping 9.Exit codes stderr stdin stdout 10.Metacharacters 11.Positional parameters 12.Looping constructs while for until 13.Conditional statements if case 14.Escaping characters
Given a scenario, carry out version control using Git.	1.Arguments clone push pull commit merge branch log init config 2.Files gitignore .git/
Summarize orchestration processes and concepts.	1.Agent 2.Agentless 3.Procedures 4.Attributes 5.Infrastructure automation 6.Infrastructure as code 7.Inventory 8.Automated configuration management 9.Build automation

Reference: https://certification.comptia.org/certifications/linux#overview

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Conclusion

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The objectives covered in the CompTIA XK0 004 test include the areas that you need to learn in order to get all the skills required for your future tasks. By mastering these skills, you will be able to pass the exam and become a competent Linux Administrator. Thus, the list of the domains to study include the following:

System and Hardware Configuration
This subject area has 21% of the exam content and contains the concepts of Linux boot processes and requires that you know the boot loaders such as GRUB and GRUB2, as well as the boot options, including NFS, UEFI/EFI, PXE, Boot from HTTP/FTP, and Boot from ISO. You should also know which file locations as well as boot modules and files can be used. They include the dracut and mkinitrd commands, efi files, vmlinux, and vmlinuz.
Besides that, you need to have the skills in installing, configuring, and monitoring kernel modules, as well as configuring and verifying network connection parameters. These processes contain various commands, such as modprobe, dmesg, lsmod, depmod, and diagnostic tools that include host, iwconfig, nslookup, etc. It is also important to know how to manage storage in a Linux environment, configure localization options, as well as contrast and compare virtualization and Cloud technologies and concepts.
Linux Diagnostics and Troubleshooting
The objective will offer you about 20% of the whole exam content that will be during your test. Its main task is to evaluate your skills in analyzing system properties in order to optimize performance and remediate accordingly, troubleshooting user issues, and analyzing hardware and app issues. These tasks include configuration and monitoring of storage, network, CPU, and memory as well as process management and troubleshooting of additional hardware issues.
You should also know about various adapters, such as SATA, SCSI, HBA, and RAID, as well as have the skills in working with dependencies that include libraries, patching, GCC compatibility, update issues, and environment variables.
Security
This topic covers about 19% of the exam content, and you will need to learn how to implement and configure appropriate authentication and configure methods, how to acquire or apply the appropriate group and/or user ownership and permissions, as well as be skillful in implementing logging services and Linux firewalls and configure them. These include your knowledge of file and directory permissions, user types, key file locations, and log management.
In this domain, you should gain the relevant skills in restoring and compressing files and know about security best practices in a Linux environment. This means that you will need to perform archivation and restoration of utilities, use extra authentication methods, and change default ports.
Scripting and Automation
About only 14% of the content is from this domain. It covers the details of the deployment and execution of the basic BASH scripts, orchestration processes and concepts, and the process of carrying out version control using Git. These tasks contain shell environments and variables, file globbing, metacharacters, conditional statements, arguments, and automated configuration management.
Systems Operation and Maintenance
In this section, which will have the largest amount of the questions (26%), you will be given several scenarios that cover the management of services, groups, and users, conduction of removals, updates, configurations, and software installations, as well as creation, redirection, and modification of files. It is also vital to have those skills that will help you manage services, understand server roles, automate and schedule jobs, as well as contrast and compare Linux graphical user interfaces. These processes include the modification of chage and passwd, usage of RPM, APT, and Zypper installation tools, as well as file and directory operations. Your expertise in monitoring and configuring tools, console redirection, and text processing should be on a decent level as well.

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