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sliding window ARQ

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State True/False:

"An ACK number of 100 in TCP always means that 99 bytes have been received successfully."

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no.since we have random initial sequence number in tcp .we cant say that the statement is true. if the sequence number started from 0 then the statement is correct..but this will not happen all the time
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may b that ack can be of the lost packet   i mean duplicate ack
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