Which of the following is a Control Flag in the TCP Header? PSH STP GET REQ

Answer: Control Flag in the TCP Header

In the context of the TCP (Transmission Control Protocol) header, control flags are used to indicate the state of a connection and to control the flow of data between two devices. The options provided are:

1. PSH: This is a control flag in the TCP header, specifically the Push flag. It indicates that the sender is requesting that the receiving TCP stack push the data to the application immediately, rather than buffering it.

2. STP: This does not correspond to any standard control flag in the TCP header.

3. GET: This is not a control flag in TCP; instead, it is typically associated with HTTP methods.

4. REQ: This is also not a control flag in TCP.

Final Answer

The correct option that represents a control flag in the TCP header is PSH.