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Raju sends Rani a TCP packet containing a $\text{2 byte}$ payload with sequence number $100$. If Rani receives it, with which acknowledgement number does she reply?
1. $99$
2. $100$
3. $101$
4. $102$

$2$ Byte payload- TCP is a byte stream and each byte has a sequence number.

Sequence number of first byte- $100$

Sequence number of second byte- $101$

So acknowledgement number (next expected sequence number) is $102$