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Which two types of IPsec can be used to secure communications between two LANs?

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Which two types of IPsec can be used to secure communications between two LANs?

(a) AH tunnel mode

(b) ESP tunnel mode

(c) Both AH tunnel mode and ESP tunnel mode

(d) ESP transport mode

I got this question by my college professor while I was bunking the class.

This intriguing question originated from AH and ESP Protocols in section Transport Layer of Computer Network

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Right choice is (c) Both AH tunnel mode and ESP tunnel mode

The explanation: The AH and ESP tunnel mode IPSec should be used for data transfer purpose, option d is for integrity & confidentiality purpose. Tunnel mode provides security for the entire original IP packet unlike transport mode which is not as secure as it only encrypts the data portion and not the whole packet.

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