Question Bank - Computer Networks

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State whether True or False.I. A Packet-Filter Firewall filters at the Application Layer whereas a Proxy Firewall filter at the Network or Transport Layer.II. The idea that the cryptanalyst knows the algorithms and that the secrecy lies exclusively in the keys is called Kerckhoffs principle.

A.
I “ false, II “ False
B.
I “ False, II “ True
C.
I “ True, II “ False
D.
I “ True, II “ True

Solution:

Concept:Packet filter firewall operates at the network and transport layer.Proxy firewall filter operates at the application layer.Kerckhoffs principle :All algorithm must be public only the keys are secret.A cryptographic system should be designed to be secure even if all its details except for the key are publicly known.Explanation:From above two points it is clear that statement 1 is false and second statement is nothing but kerckhoffs principle so option 2 is the correct answer.

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