These small packets travel through a node only if they match with predefined filtering rules otherwise get dropped. The information passes through a network in the form of small pieces called packets, which travel independently across IP networks. Packet filtering protects a local network from undesired invasion depending upon the predefined rules. Let’s understand What is a packet-filtering firewall? It is a security mechanism that allows the movement of packets across the network and controls their flow on the basis of a set of rules, protocols, IP addresses, and ports. A packet filtering firewall is a network security technique that is used to control data flow to and from a network.
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