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Eccouncil ICS-SCADA Exam - Topic 6 Question 40 Discussion

Which of the IPsec headers contains the Security Parameters Index (SPI)?
B) Both AH and ESP
A) AH
C) ESP
D) ICV

Eccouncil ICS-SCADA Exam - Topic 6 Question 40 Discussion

Actual exam question for Eccouncil's ICS-SCADA exam
Question #: 40
Topic #: 6
[All ICS-SCADA Questions]

Which of the IPsec headers contains the Security Parameters Index (SPI)?

Show Suggested Answer Hide Answer
Suggested Answer: B

IPsec uses two main protocols to secure network communications: Authentication Header (AH) and Encapsulating Security Payload (ESP).

Both AH and ESP use a Security Parameters Index (SPI), which is a critical component of their headers. The SPI is a unique identifier that enables the receiver to select the correct security association for processing incoming packets.

AH provides authentication and integrity, while ESP provides confidentiality, in addition to authentication and integrity. Both protocols use the SPI to manage these functions securely.

Reference

'IPsec Security Architecture,' RFC 4302 (AH) and RFC 4303 (ESP).

'IPsec Explained,' by Juniper Networks.


by Arlene at Apr 03, 2026, 09:40 AM

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Dwight
21 days ago
I feel like it's definitely C) ESP. AH doesn't have SPI.
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Amos
27 days ago
I agree, but B) Both AH and ESP could be a trick option.
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Dean
1 month ago
I think it's C) ESP. The SPI is part of that header.
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Lizbeth
1 month ago
I always get confused with these headers!
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Brett
1 month ago
Definitely C) ESP, no doubt about it!
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Regenia
2 months ago
Wait, are you sure it's not A) AH?
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Alfred
3 months ago
I thought it was B) Both AH and ESP?
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Werner
3 months ago
It's C) ESP that has the SPI.
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Levi
4 months ago
I remember the SPI is definitely in ESP, but I’m not confident if AH has it too. This is tricky!
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Matthew
4 months ago
I’m leaning towards option C, just ESP, since AH is more about integrity, right? But I might be second-guessing myself.
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Jeffrey
4 months ago
I practiced a similar question last week, and I believe both AH and ESP include the SPI. But I could be mixing things up.
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Halina
5 months ago
I think the SPI is part of the ESP header, but I’m not completely sure. I remember something about it being related to encryption.
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