Psh ack意思

"PSH ack" is a term used in the context of TCP/IP networking. It stands for "Push Acknowledgment" and refers to a TCP packet that is sent in response to a PSH (Push) flag being set in a previous TCP packet.

Here's a brief explanation of what it means:

• PSH: The PSH flag is a control bit in TCP packets. When the PSH flag is set, it tells the receiving application to immediately deliver the data from the TCP buffer to the application, rather than buffering it. This is useful when the application is ready to process the data immediately and there is no need for further buffering.

• ACK: The ACK (Acknowledgment) flag is another control bit in TCP packets. When the ACK flag is set, it indicates that the receiving TCP entity is acknowledging the receipt of the data from the previous segment.

So, when a TCP packet with the PSH flag set is received, the receiving end will send back a TCP packet with the ACK flag set, acknowledging the receipt of the data and indicating that the data has been pushed to the application.

This exchange is part of the normal flow of data in a TCP connection and is used to ensure that data is transferred reliably and efficiently between the client and server.