What is Network Security?

One of the main topics of computer networks is Network Security. After configuring and deploying the hardware, we must pay special attention to this topic. In this section, we will examine the following:

• What is computer network security?
• Wireless networks
• Firewall

What is computer network security?

It includes things like software used, data stored, and information theft. Everything that is used in a computer network system (both software and hardware) must be protected against attacks and risks.

Three principal factors are needed in the security of a computer network, these three factors (CIA) are the basic principles of information-security in information storage and exchange environments.

• Confidentiality
• integrity
• Availability

Confidentiality:

That is, the information should be available only to those who need it. For example, leaving part of a company’s confidential file

Integrity: 

• Just authorized persons or instructions can change system
• authorized people or processes cannot change system without permission and without reason,
• It is necessary to maintain the integrity of information inside and outside the system, and it must be the same inside and outside the system, and if the information changes, they must be aware of it both inside and outside the system.

Availability:

Information should always be available and able to do its job, and there should never be a factor that disrupts the system’s work. For example, if the power goes out and we don’t have a solution for it, this system is not safe.

There are many concepts in the discussion of network security, which can be mentioned as these basic concepts:

• Identification: requesting identification when the user accesses the system,
• Authentication: specifying the user’s identity
• Authorization: the level of user access to resources.
• Accountability: ability to audit system performance

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