packet filtering firewall works at which of these layers of the osi model

A packet filtering firewall operates at the Network Layer (Layer 3) of the OSI model. This layer is responsible for routing and forwarding packets based on network addresses (such as IP addresses) and making decisions about how packets should be directed through a network. Packet filtering firewalls examine the header information of packets, such as source and destination IP addresses, ports, and protocols, to determine whether to allow or block the packets based on predefined rules or policies.