COMPUTER FUNDAMENTALS

Detailed explanation-1: -Packet filtering is defined as “controlling network access by evaluating incoming and outgoing packets and allowing or rejecting them depending on the source and destination IP addresses.” Packet filtering is one of the numerous techniques for constructing security firewalls."

Detailed explanation-2: -According to the internet.com webopedia, packet filtering is “controlling access to a network by analyzing the incoming and outgoing packets and letting them pass or halting them based on the IP address of the source and destination.

Detailed explanation-3: -Packet filtering is the process of passing or blocking data packets at a network interface by a firewall based on source and destination addresses, ports or protocols.

Detailed explanation-4: -A packet filtering firewall is a network security feature that controls the flow of incoming and outgoing network data. The firewall examines each packet, which comprises user data and control information, and tests them according to a set of pre-established rules.

Detailed explanation-5: -Packet filtering routers operate at the network and transport layers and in addition to performing the basic function of routing, they use screening rules to filter packets. These rules use IP addresses, IP options, TCP/UDP ports, and ICMP message types in making filtering decisions.