Question
Which of the following is the last part of ICMP message
format?Solution
Why this is correct:
ICMP messages typically follow: Type (8 bits), Code (8 bits), Checksum (16 bits), followed by a variable part (rest of header specifics) and then the data/payload region (variable length). The payload/data is the final variable-length portion. Why the others are wrong: 1.     "Extended Header" is not the standard last field name. 2.     Checksum appears earlier (after Type and Code), not last. 3.     Code is an early fixed field, not the last field.
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