What are the TCP flags?

What will be an ideal response?


There are six possible TCP packet flags: URG, ACK, PSH, RST, SYN, and FIN. Packets can have more than one flag set, and this is indicated by the flag names being separated by a slash, such as SYN/ACK, or a comma, such as ACK, FIN.SYN/ACK says the packet is attempting to both synchronize with the sender and acknowledge the received packet. Normally a packet will have only one flag sent, except in the case of SYN/ACK or FIN/ACK. You will never see an RST/FIN packet because these flags signal the same result. Packets with three or more flags set are probably attempts to crash your machine. A packet with all six flags set is called a "Christmas Tree Packet," or a "Nastygram." Newer implementations of TCP/IP usually drop packets like this.

Computer Science & Information Technology

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