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A packet filter firewall filters at __________(a) Physical layer(b) Data link layer(c) Network layer or Transport layer(d) Application layerThis question was addressed to me by my college director while I was bunking the class.This key question is from Firewalls topic in portion Network Layer of Computer Network

Answer»

Right answer is (c) Network layer or TRANSPORT layer

Explanation: In computing, a firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security RULES.[1] A firewall TYPICALLY establishes a barrier between a trusted, secure internal network and ANOTHER OUTSIDE network, such as the Internet, that is assumed not to be secure or trusted.[2] Firewalls are often categorized as either network firewalls or host-based firewalls.


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