a) SYN, SYN-ACK, and ACK are the three steps taken during the exchange of these four flags.
b) By using the FIN bit in the TCP Flags, a TCP connection can be terminated. A packet with the TCP Finished flag set is sent by one side of the connection.
One of the key Internet protocol suite protocols is the Transmission Control Protocol (TCP). It was first used in the initial network implementation to support the Internet Protocol (IP). As a result, TCP/IP is the name given to the full suite. Between programs operating on hosts interacting over an IP network, TCP offers dependable, organized, and error-checked transmission of a stream of octets (bytes). TCP, which is a component of the TCP/IP suite's Transport Layer, is essential to many important internet applications, including the World Wide Web, email, remote administration, and file transfer. Often, TCP is layered with SSL/TLS. Since TCP connection is oriented, a connection must first be made between the client and the server in order to send data.
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