1.1-3 What is a protocol? Which of the following human scenarios involve a protocol (recall: "Protocols define the format, order of messages sent and received among network entities, and actions taken on message transmission, receipt")? Select one or more answers below that are correct. [Hint: more than one of the answers below are correct.]多项选择题
A
One person asking, and getting, the time to/from another person.
B
A person reading a book.
C
A person sleeping.
D
Two people introducing themselves to each other.
E
A student raising her/his hand to ask a really insightful question, followed by the teaching acknowledging the student, listening carefully to the question, and responding with a clear, insightful answer. And then thanking the student for the question, since teachers love to get questions.
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