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IP Security operates in which layer of the OSI model?

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IP Security operates in which layer of the OSI model?

(a) Network

(b) Transport

(c) Application

(d) Physical

The question was asked during an interview.

My question is based upon AH and ESP Protocols topic in division Transport Layer of Computer Network

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Best answer
Right choice is (a) Network

The best I can explain: IPSec is a set of protocols used to provide authentication, data integrity and confidentiality between two machines in an IP network. In the TCP/IP model, it provides security at the IP layer i.e. the network layer.

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