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XK0-004 test
Format | XK0-004 Course Contents | XK0-004 Course Outline | XK0-004 test
Syllabus | XK0-004 test
Objectives
Exam Description : CompTIA Linux+ validates the skills of IT professionals with hands-on experience
configuring, monitoring, and supporting servers running the Linux operating system. The new test
has an increased focus on the following topics: security, kernel modules, storage & visualization, device management at an enterprise level, git & automation, networking & firewalls, server side & command line, server (vs. client-based) coverage, troubleshooting and SELinux.
Number of Questions Maximum of 90 questions
Type of Questions Performance-based, Multiple Choice (Single Response), Multiple Response and Fill-in-the-Blank
Length of Test 90 Minutes
Passing Score 720 (on a scale of 100 to 900)
Recommended Experience CompTIA A+, CompTIA Network+ and 12 months of Linux admin experience
XK0-004 test
Syllabus
1. Boot loaders
GRUB
GRUB2
2. Boot options
UEFI/EFI
PXE
NFS
Boot from ISO
Boot from HTTP/FTP
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
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
Global entries
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
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
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
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
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
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
6. Troubleshooting additional hardware issues
Memory
Printers
Video
GPU drivers
Communications ports
USB
Keyboard mapping
Hardware or software compatibility 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
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The Computing expertise industry association (CompTIA) is a non-earnings alternate affiliation that gives expert certification for the advice technology (IT) trade. it is regarded one of the suitable change associations within the IT industry.
As a number one IT trade affiliation, CompTIA has created a variety of educational courses and programs to advantage IT specialists, educators, and business homeowners.
magnitude of CompTIA Certifications
The Computing expertise business affiliation (CompTIA) offers many IT certifications exams to aid you qualify for prime-paying jobs. CompTIA certification covers a wide range of disciplines, including computing device fundamentals, IT security, laptop networking, and Linux programming. however before starting a CompTIA study, remember to decide which certification best suits your expertise and profession desires.
kinds of CompTIA Certifications
in case you are only beginning out in the IT industry, then CompTIA A+ certification could be correct for you. The CompTIA A+ certification is designed to exhibit its capabilities as a laptop technician. It covers subjects
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is also vendor-neutral and internationally authorized; so many employers see it as legit facts of your use of the computer. A+ certification is a stepping stone to extra superior CompTIA certification, so in case you are only starting out in the information technology trade, here is a have to.
for those who are more interested in crucial and upcoming areas, CompTIA security+ certification is the best option. This certification demonstrates your skill to manage gadget security, network infrastructure, and organizational safety. The quantity and severity of computing device security threats are expanding, so the certification has high demand amongst employers in business, healthcare, and govt. The pursuit of CompTIA safety+ certification will make certain the defense of employees in the following few years.
yet another crucial CompTIA certification is CompTIA community+. This certification has the ability to manipulate, keep, troubleshoot, deploy and configure a laptop network infrastructure. here's certainly important for groups with tremendous computing device networks that connect hundreds of employees. there is a relentless need for IT community authorities, so getting CompTIA network + certification is a superb next step after finishing A+ certification.
if you're captivated with open source applied sciences and a few Linux experiences, then be sure to accept as true with continuing to make use of CompTIA Linux+ certification. This examination covers Linux device administration, person management, file permissions, software configuration, and Linux-based mostly customer administration. As many businesses flip to open source application as a way to in the reduction of charges, certified Linux certified
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