Introduction to CentOS

Question 1

is a rolling-release Linux distribution that provides a “preview” of what will be in the next RHEL minor release.

Answer 1

CentOS Stream

Question 2

With ____ , users gain access to newer features and packages as they’re prepared for RHEL 9.

Answer 2

CentOS 9

Question 3

Key Use Cases (3):
(idk if kasama pa)

Answer 3

1. Development & Testing
2. Production -Ready for Certain Environments
3. Cloud and Containers

Question 4

is a text-based interface that allows users to execute commands for managing files, processes, and system settings.​

Answer 4

Command Line

Question 5

CentOS 9 uses the ____ by default, although other shells like Zsh can be installed.​

Answer 5

Bash Shell

Question 6

CentOS 9 uses ____ as its primary package manager, replacing the older yum.

Answer 6

dnf

Question 7

The ____ command is used to install, update, and manage software packages.​

Answer 7

dnf

Question 8

command for update

Answer 8

sudo dnf update

Question 9

List of Package Management with DNF Commands
(11!!!)

Answer 9

1. dnf
2. sudo dnf update
3. sudo dnf install < package_name >
4. sudo dnf remove < package_name >
5. sudo dnf search < keyword >
6. sudo dnf list installed
7. sudo systemctl start < service_name >
8. sudo systemctl stop < service_name >
9. sudo systemctl restart < service_name >
10. sudo systemctl enable < service_name >
11. sudo systemctl status < service_name >
12. sudo systemctl list-units –type=service

Question 10

The ____ command in Linux lists directory contents, displaying files and subdirectories.

Answer 10

ls (list)

Question 11

a command-line utility that allows users to create new directories.

Answer 11

mkdir < directory_name >

Question 12

used to change directories. You can navigate to a specific directory by specifying its path.

Answer 12

cd < directory_name >

Question 13

This command is used to copy files or group of files or directories.

Answer 13

cp < source >< destination >

Question 14

short for “remove”. is used for deleting files and directories.

Answer 14

rm < filename >

deletes files. It does not work on directories unless combined with specific options.
source: chatGPT

Question 15

it is used for deleting files and directories

Answer 15

rm -r < directory name >

Used to delete directories and their contents, including files and subdirectories.
source: chatGPT

Question 16

____ are key tasks in system administration

Answer 16

Network configuration and troubleshooting

Question 17

Networking Commands:

will display the address configuration for all interfaces on the Linux workstation.

Answer 17

ip addr show

Question 18

Networking Commands

tests the connection between the local machine and a remote address or machine

Answer 18

ping < hostname ____or____ IP >

Question 19

Networking Commands

View Network Connection Status.

Answer 19

nmcli device status

Question 20

Networking Commands

Enable or Disable a Network Connection.

Answer 20

nmcli con up < connection_name > for enable
nmcli con down < connection_name > for disable

Question 21

Networking Commands

Open and Close Ports Using firewalls.

Answer 21

sudo firewall-cmd –add-port=80/tcp –permanent

Question 22

Networking Commands

to reload

Answer 22

sudo firewall-cmd –reload

Question 23

User and Group Management commands:

Creates new user

Answer 23

sudo useradd < username >

Question 24

User and Group Management commands:

Set user password

Answer 24

sudo passwd < password >

Question 25

User and Group Management commands:

Add a User to a Group.

Answer 25

sudo usermod -aG < group > < username >

Question 26

User and Group Management commands:

deletes user

Answer 26

sudo userdel < username >

Question 27

User and Group Management commands:

View user ID and Group ID

Answer 27

id < username >

Question 28

provides access control security policies. In CentOS, it is enabled by default.

Answer 28

SELinux (Security-Enhanced Linux)

Question 29

Security with SELinux

check SELinux status

Answer 29

sestatus

Question 30

Security with SELinux

Set to permissive mode.

Answer 30

sudo setenforce 0

Question 31

Security with SELinux

Set to enforcing mode

Answer 31

sudo setenforce 1

Question 32

Security with SELinux

View Current SELinux Context for a File

Answer 32

ls -Z < filename >

Question 33

Is Monitoring processes, CPU, and memory usage is important for system health and performance?

Answer 33

TRUE!!!

Question 34

Monitoring and Process Management commands

display running process.

Answer 34

ps aux

Question 35

Monitoring and Process Management commands

View Real-Time System Activity​

Answer 35

top

Question 36

Monitoring and Process Management commands

Enhanced Real-Time System Monitoring

Answer 36

htop

Question 37

Monitoring and Process Management commands

Kill a Process

Answer 37

kill

Question 38

Disk and File System Management commands

List Block Devices

Answer 38

lsblk

Question 39

Disk and File System Management commands

Display Disk usage

Answer 39

df -h

Question 40

Disk and File System Management commands

check free and used memory

Answer 40

free -h

Question 41

Is managing disk space and partitions is important for organizing and ensuring the availability of storage?

Answer 41

TRUE!!!

Question 42

Scheduling regular tasks with ____ allows automation for routine processes like backups or updates.

Answer 42

Cron

Question 43

Create/Edit Cron Jobs

Answer 43

crontab -e

Question 44

View Scheduled Cron Jobs​

Answer 44

crontab -l

Question 45

what command that each * represents a time field (minute, hour, day, month, day of the week), allowing you to schedule commands at specific times?

Answer 45

** /path/to/command