VeEX MTX150x Lite, User Manual

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Ethernet © VeEX Inc. All Rights Reserved. 42
TCP is a connection oriented protocol. A Connection is established prior to data transmission between the two
end devices (client and server). A 3-way handshake procedure is used to establish connection.
When a connection is established, the data transfer can start. TCP uses sequence numbers to reassemble
data and verify that no data has been lost.
TCP uses the Window mechanism for Flow Control:
1. The Sender indicates in the Window size the data it is prepared to receive
2. The Window size is the amount of outstanding data that can be sent before acknowledgment is
received
3. If data is lost, the window size is decreased and less data is sent prior to acknowledgment
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Step 1: Client sends a SYN message with SYN flag set in the TCP header. The Sequence number
specifies the number assigned to the first segment.