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Question 53 - ICS-SCADA Cyber Security discussion

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How many IPsec modes are there?

A.
Four
Answers
A.
Four
B.
Three
Answers
B.
Three
C.
None of these
Answers
C.
None of these
D.
Two
Answers
D.
Two
Suggested answer: D

Explanation:

IPsec (Internet Protocol Security) primarily operates in two modes: Transport mode and Tunnel mode.

Transport mode: Encrypts only the payload of each packet, leaving the header untouched. This mode is typically used for end-to-end communication between two systems.

Tunnel mode: Encrypts both the payload and the header of each IP packet, which is then encapsulated into a new IP packet with a new header. Tunnel mode is often used for network-to-network communications (e.g., between two gateways) or between a remote client and a gateway.

Reference

'Security Architecture for the Internet Protocol,' RFC 4301.

'IPsec Modes of Operation,' by Internet Engineering Task Force (IETF).

asked 18/09/2024
Kodjo Boessi
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