Explain the concept of network packet filtering.

Explain the concept of network packet filtering.

Network packet filtering is a technique used to control and monitor the flow of data packets within a network. It involves examining the headers and contents of each packet and making decisions based on predefined rules or filters. These filters can be set up to allow or block specific types of traffic based on various criteria such as source or destination IP addresses, port numbers, protocols, or packet contents. Network packet filtering helps in enhancing network security by preventing unauthorized access, blocking malicious traffic, and enforcing network policies.