Multiple choice

A _____ is put in front of the message to identify it.

  1. trailer

  2. note

  3. header

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A header is a block of control data added to the beginning of a message or packet to provide necessary routing and handling information. It acts like an envelope that tells the network where the data is going and how it should be treated. A trailer is similar but is added to the end of the packet, usually for error-checking purposes.

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