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In a TCP three-way handshake process, a sender receives a TCP segment with SYN and ACK bit set from the receiver as a response for the sender's TCP segment (SYN bit set). If the value of that receiver's ACK is 3001, what could be the Initial Sequence Number sent by the sender?
1
0
3001
3000
none of the choices
The value of ACK in a TCP communication is the expected value to be received by the receiver. For example, an ACK of 3 means that the sender of this ACK successfully received bytes 1 and 2 from the sender, the next two bytes (3 and 4) are what the receiver expects to receive. In this scenario, the receiver's ACK is 3001 (which means the receiver had received the first or at least byte 3000 from the sender). (http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/12-4t/iap-12-4t-book/iap-tcp.html#GUID-C92CF261-1264-4CB2-9625-A076BC2466A2)
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