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