Understanding TCP Flags SYN ACK RST FIN URG PSH

TCP flags are a way to communicate information between two devices on the network. The flag is set by the sender and then verified by the receiver. There are six TCP flags: SYN, ACK, RST, FIN, URG, and PSH. Understanding these flags can help you troubleshoot networking issues.

What are TCP Flags?

The Transmission Control Protocol (TCP) is a networking protocol that enables two hosts to establish a reliable connection and exchange data. The TCP header includes a field of 16 bits called the TCP flags. The flags are used to indicate the state of the connection and can be set manually or automatically by the protocol. In this article, we will discuss what the TCP flags mean and how they are used.

SYN: Synchronize

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ACK: Acknowledge

ACK is an acknowledgment that something has been received and understood. It can be used to confirm receipt of an email, a text message, or any other communication. The acronym is typically followed by a brief message confirming that the recipient has seen and understands the information. ACK can also be used as a stand-alone response to indicate that you have received and understood a communication.

RST: Reset

RST is a protocol for wireless communication. It stands for Retransmission, Scheduling and Transmission. It was designed to improve the reliability of data transmission in noisy environments. RST is used in a variety of applications, including industrial control, medical devices and automotive systems.

TCP Flags For 3 Way Handshake

In computer networking, the Transmission Control Protocol (TCP) is a transport layer protocol that enables two hosts to establish a network connection and exchange data. When two hosts want to communicate over a TCP connection, they first establish what is known as a three-way handshake.

TCP Flags For Normal Data Transfer Connection

TCP flags are a set of control codes used to manage the flow of data between computers. The flags are set in the header of each TCP packet and can be used to indicate such things as whether a packet is part of a larger message, or if it has been corrupted. There are also a number of special-purpose flags that can be used to optimize data transfer. In normal data transfer connections, the following flags should be set: TCP SYN: This flag is used to indicate that the TCP layer has a request for a connection from the application layer. When this flag is set, the first data packet of the session contains the source port number and sequence number of the application (client).


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