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CompTIA XK0-004: Skills Measured

This certification exam is designed to validate the skills and knowledge of the IT professionals with practical experience in supporting, configuring, and monitoring the servers that are functioning on the Linux operating system. The test focuses on a variety of topics, including security, storage and virtualization, kernel models, device management within an enterprise, networking and firewalls, troubleshooting & SELinux, git and automation, server-side & command line, and server versus client-based coverage. The highlights of the domains included in the exam syllabus are enumerated below:

Security: 19%
This section requires the students’ skills and competence in acquiring or applying the relevant group or/and user ownership and permissions; configuring and implementing the relevant authentication and access methods; summarizing best practices within the Linux environment; implementing logging services; backing up, restoring, and compressing files.
Systems Operation & Maintenance: 26%
The examinees should have competence in conducting software installations, updates, configurations, and removals; managing groups and users; creating, redirecting, and modifying files; managing services; describing and summarizing server roles; scheduling and automating jobs. The individuals should also be able to describe the operation and usage of Linux devices and compare and contrast the graphical user interfaces of Linux.
Linux Troubleshooting & Diagnostics: 20%
The test takers should be able to demonstrate their knowledge and skills in analyzing and remediating system properties; analyzing system processes for optimizing performance; analyzing and troubleshooting user issues; analyzing and troubleshooting hardware and application issues.
Automation & Scripting: 14%
This subject area requires one’s skills in executing and deploying fundamental BASH scripts; performing version control with the use of Git; summarizing orchestration concepts and processes.
Hardware & System Configuration: 21%
This topic measures the ability of the candidates to describe the concepts of a Linux boot process; verify and configure the network connection parameters; manage storage within the Linux environments; compare and contrast virtualization and Cloud technologies and concepts; configure localization alternatives.

CompTIA Linux+ XK0-004 Exam

CompTIA Linux+ XK0-004 Exam which is related to CompTIA Linux+ Certification. This exam validates the Candidate ability to configure, monitor, and support servers running the Linux operating system. It also deals with the knowledge and skills of security, kernel modules, storage and visualization, device management at an enterprise level, git and automation, networking and firewalls, server side and command line, server (vs. client-based) coverage, troubleshooting and SELinux.

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

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