A packet-filtering firewall works at layer 3 of the OSI model. Layer 3 or the network layer of the OSI model deals with TCP and UDP packets and information that comes with it like source and destination IP addresses. The packet filtering firewall falls perfectly in place by filtering the said information in layer 3.
Explanation:
Organizations should take bold initiatives to protect their data by identifying various Firewall architectures. Packet-filtering firewalls are among the most common firewall architectures out there. It is one of the oldest types of firewalls built to create a check or junction points where devices like a switch or router can operate. It makes processing decisions based on packet information that comes in through the router. Information such as source and destination IP addresses is inspected.
It is at this point where packets that are deemed malicious are dropped and not forwarded at all. One massive advantage of Packet-filtering firewalls is that it is fast and not resource-intensive. This advantage, however, poses as an insecurity problem. Since they are not involved with so much inspection of internal traffic, they will typically forward any traffic via an approved, open port. This, in a way, will allow malicious traffic to go through and might not be blocked.
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