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Control Flags, the Three Way Handshake, and the Four Way Handshake, Node A…
Control Flags, the Three Way Handshake, and the Four Way Handshake
Node A (transmitting)
- Sends TCP segment with SYN flag set
- Responds with a TCP segment that has an ACK flag set.
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Node B (receiving)
- Sends TCP segment with SYN and ACK flags set
URG(Urgent)- a value of one indicates the segment is considered urgent and the urgent pointer field has more data about this.
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PSH (Push)- transmitting device wants the receiving device to push currently buffered-data to the app on the receiving end asap
RST (Reset)- one of the sides in a TCP connection hasn't been able to properly recover from a series of missing or malformed segments
SYN (Synchronize) - used when first establishing a TCP connection and makes sure the receiving end knows to examine the sequence number field.
FIN(Finish)- a value of one indicates the transmitting device doesn't have anymore data to send and the connection can be closed.
Handshake- a way for two devices to ensure that they're speaking the same protocol and will be able to understand each other.
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