Question

Which of the followings are/is true for a transport layer checksum?
a. Checksum is a simple method to check packet integrity.
b. In case of TCP or UDP, checksum is computed from the payload and the TCP or UDP headers only.
c. In case UDP or TCP, checksum is computed from the payload, the transport layer header and a pseudo IP header.
d. Checksum provides security against message confidentiality violation attacks.

Answer 1

Concept Introduction: Checksum is a small part of data.

Explanation:

We have been Given: One of these are true for Transport Layer Checksum:

1. Checksum is a simple method to check packet integrity.
2. In case of TCP or UDP, checksum is computed from the payload and the TCP or UDP headers only.
3. In case UDP or TCP, checksum is computed from the payload, the transport layer header and a pseudo IP header.
4. Checksum provides security against message confidentiality violation attacks.

We have to Find: which option is correct?

Option No. 3 is correct.

Final Answer: In case of UDP or TCP, checksum is computed from the payload, the transport layer header and a Pseudo IP Header is true for Transport layer header.

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