Software firewalls work at which layer of the OSI model?
A.
Application
B.
Network
C.
Transport
D.
Data Link
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Put simply, the OSI model is a layered model of network architecture. This model governs how two systems that are interconnected communicate. The top layer (application layer) is typically the layer at which the “proxy based firewalls” operate at.
Firewalking: technique for testing the vulnerability of a firewall and mapping the routers of a network that sits behind a firewall. It is a method of disguising port scans.
Not D.