DATA LINK LAYER WIRED NETWORKS
DATA LINK CONTROL DLC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The sender resends the data if it does not receive confirmation after a certain amount of time
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The sender compares the sent data to the original and sees if an error occurred
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The receiver checks with the sender to find out whether the data was sent correctly
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The sender checks whether the receiver has received the data by performing a calculation on a check digit
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Detailed explanation-1: -Stop-and-Wait ARQ is the basic form of ARQ protocol where the sender sends one packet at a time and then waits for an ACK or NACK signal from the receiver before sending the same or a new packet. The receiver sends an ACK signal following receipt of a good packet.
Detailed explanation-2: -To detect and correct corrupted frames, we need to add redundancy bits to our data frame. When the frame arrives at the receiver site, it is checked and if it is corrupted, it is silently discarded. The detection of errors in this protocol is manifested by the silence of the receiver.
Detailed explanation-3: -The stop and wait ARQ protocol sends a data frame and then waits for an acknowledgment or ACK from the receiver. The ACK means that the receiver has successfully received the data frame. After the sender receives the ACK from the receiver, it sends the next data frame.