What is Network Security ?

Network security: This topic covers the various methods and technologies that are used to protect networks and systems from unauthorized access and other security threats. This includes concepts such as:

1. Firewalls: A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predefined security rules and policies. Firewalls can be hardware-based or software-based, and can be used to block unauthorized access, prevent malware from spreading, and monitor network activity for suspicious behavior.
2. Intrusion detection and prevention systems (IDPS): These are security systems that are designed to detect and prevent unauthorized access, misuse, and other malicious activity on a network. IDPS systems can be signature-based, which means they rely on predefined patterns of known malicious activity, or behavior-based, which means they look for unusual activity that deviates from normal network behavior.
3. Virtual Private Networks (VPNs): A VPN is a private network that is created over a public network, such as the internet. VPNs use encryption and other security measures to protect the privacy and integrity of data as it is transmitted over the public network. VPNs are commonly used to provide secure remote access to a company's internal network.
4. Network segmentation: This is the practice of dividing a network into smaller, isolated segments, in order to limit the spread of security threats and improve the overall security of the network. Network segmentation can be accomplished through the use of firewalls, VPNs, and other security measures.