Question

________ is necessary to know if the message reached the receiver correctly​

Answer 1

Answer:

You will get tick marks with blue or white

Answer 2

Acknowledgement is the correct answer to the given question

Explanation:

• The main objective of acknowledgement that describe that message is received correct and by the correct user .If there is any problem occur or wrong message will delivered then the user will also send the acknowledgement .
• If we don't sends the acknowledgement we will be never knows whether the message we send or received is correct or not .So for receiver point of you be always send the acknowledgement. Many protocols like TCP used acknowledgement technique.

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• brainly.in/question/10723399