What are the three requirements defined by protocols for message transmission across a network?

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Protocols establish specific requirements to ensure successful message transmission across a network. One of the fundamental aspects is message framing, which involves how the data packets are structured for efficient transport. Another critical requirement is error checking, which allows the detection of any corruption that may occur during transmission, ensuring that the message received is identical to the message sent. Lastly, acknowledgment is necessary to confirm that messages have been received successfully, enabling reliable communication.

The correct answer emphasizes these aspects of message transmission, which are vital in maintaining integrity and reliability in network communications. Proper framing ensures that data is packaged correctly, error checking safeguards against data corruption, and acknowledgment mechanisms help to verify successful delivery, making the communication process robust and efficient.