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Linux

In this section, you can see the training provided in Linux. Please help us improve these tutorials by adding a comment.

Firewall in CentOS

Firewall in CentOS In this tutorial we want to try Firewall in CentOS but before that we ask: What is a firewall? Firewalls are the first line of defense in network security. They are a network security device that can be hardware or software and control incoming and outgoing traffic. Firewall is a part of network security that controls and filters traffic. The firewall place between the Internet and the end user and filters the Internet based on the rules previously defined for it and whether it allows access or not. In Linux, Netfilter use to allow access or…

How to Create Users in Linux (useradd Command)

How to Create Users in Linux (useradd Command) In this course of Linux commands, we will introduce How to Create Users in Linux (useradd Command). We start tutorial by mentioning the structure and example. In Linux, the adduser command is for creating a user. There are several commands and methods to create a user in Linux, such as useradd, adduser. One of the features of the Linux operating system is multi-user support. It is possible to create different users and separate groups by specifying the access level for each user or group in Linux. The two commands adduser and useradd work…

Interface problem in Kali Linux

How can solve Interface problem in Kali Linux: Sometimes when we install Kali Linux, we have Interface problem and we don’t have any interface in the network settings at first, in this tutorial we will teach you, how we can add an interface and make the corresponding settings. We check some setting in Kali Linux: First, we can check settings and if we can add interface, we do it by graphic mode. If the option to add was off and we cannot add it, then we try by command. To check setting by command we type ifconfig. If any interface…

Linux Command – (apt-get)(Shutdown)(tree)(which-where)

Linux Command In this course of Linux commands, we will introduce four Linux Command – (apt-get)(Shutdown)(tree)(which-where): apt-get Shutdown tree which-where (apt-get): The apt-get update command updates the list of available packages (programs) that can be downloaded. *If you type this command as a non-root user, the system will refuse to execute the command because the user does not have the necessary privileges. > apt-get update -y > sudo apt-get update -y let’s to see video from our YouTube channel (Shutdown): • The shutdown command allows you to schedule device shutdowns and restarts, sends a warning message, and prevents other users…

Port Scanning

What is Port Scanning? It is an intrusion method that hackers use to find open entrances or network weaknesses. Through this attack, they find open ports in the system and can send or receive information. They can make sure that firewalls are active or inactive by cyber-attack on ports scanning. They send a packet to a port and in the message that they receive, they can determine whether the port is active or inactive and whether there is a weak point to enter the system or not. Network administrators inform about the vulnerability of the network system in companies and…

Linux

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