Software Firewall Osi Layer. This layer is embedded as software in your computers Network Interface Card NIC. Layer 7 - Application.
Unless your firewall uses the OSI model it is of little value to speak about it in these terms. Information Security and Computer Security. Protecting confidentiality integrity availability of Data.
Layer 2 enables frames to be transported via local media eg.
Layer 7 - Application. It is the lowest layer of the OSI model. If it is it operates at L3L4 and at the Application Layer. That being said it largely depends on if your firewall is capable of doing Deep Packet Inspection.