In TCP connections, what role does the SYN packet play?

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The SYN packet plays a crucial role in establishing a connection in TCP (Transmission Control Protocol). When a client wants to initiate a connection to a server, it sends a SYN (synchronize) packet as the first step in the TCP three-way handshake process. This handshake consists of the following steps:

  1. The client sends a SYN packet to the server, indicating that it wants to establish a connection.
  2. The server responds with a SYN-ACK (synchronize-acknowledge) packet, acknowledging receipt of the SYN and indicating its willingness to establish the connection.
  3. Finally, the client sends an ACK (acknowledgment) packet back to the server, confirming the establishment of the connection.

This process ensures that both parties are synchronized and ready for data transmission. The SYN packet is fundamental to initiating this sequence, making it essential for connection establishment in the TCP protocol. The other options—connection rejection, connection termination, and connection verification—do not accurately reflect the purpose of the SYN packet in the context of establishing a connection.

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