All security and network professional need to packet tracking and analaysing on network. Sometimes we use for this process, Wireshark, Tcpdump or similar application. I think every people who is network manager or security admin know that what are “flags” , 3 handshake or TCP packet structures. When we using Nmap scanner (SYN scan) for check the target systems, it has been answering like as SYN-ACK or ACK etc. . These answers depend on your scan method. The following are hexedecimal represantation of the flags value.