When does the station B send a positive acknowledgement (ACK) to station A in Stop & Wait protocol?

Q.  When does the station B send a positive acknowledgement (ACK) to station A in Stop and Wait protocol?
- Published on 30 Oct 15

a. Only when no error occurs at the transmission level
b. When retransmission of old packet in a novel frame is necessary
c. Only when station B receives frame with errors
d. All of the above

ANSWER: Only when no error occurs at the transmission level

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