TCP/IP Header Flags: A Beginner’s Guide to Understanding and Using Them

What is TCP IP header?

TCP IP header refers to Transmission Control Protocol is responsible to make communication between devices and send data over the network.

It provides reliable, ordered, and error check communications. Major internet applications rely on this protocol such as World wide web, email, remote administration, file transfer, etc. Applications that don’t require reliability use UDP (User Datagram Protocol).

  • TCP has main operations at the time of communication:
  • Establish connections
  • Terminate connections
  • Reliable Transmission
  • Error Detection and check sum
  • Flow Control
  • Congestion control
  • Decide maximum segment size
  • Acknowledgment of transfer data
  • Forcing data delivery

And these operations are handled by TCP IP header Communication flags. There are six types of Flags used by TCP

URG (Urgent)
Data with this flag should be processed immediately
FIN (finish)
this flag tell there is no more data remain for transmission on the remote system
RST (Reset)
It is used to reset the connection
PSH (Push)
It is used to instruct to send all buffered data immediately to the receiving system
ACK (Acknowledgement)
Used acknowledge the receipt data packets
SYN (Synchronize)
It is used to initiate the connection between the hosts

To know More: Packetcrafter

MODULE 5:- Scanning Network and Vulnerability

  1. Introduction of port Scanning – Penetration testing
  2. TCP IP header flags list
  3. Examples of Network Scanning for Live Host by Kali Linux
  4. important nmap commands in Kali Linux with Example
  5. Techniques of Nmap port scanner – Scanning
  6. Nmap Timing Templates – You should know
  7. Nmap options for Firewall IDS evasion in Kali Linux
  8. commands to save Nmap output to file
  9. Nmap Scripts in Kali Linux
  10. 10 best open port checker Or Scanner
  11. 10 hping3 examples for scanning network in Kali Linux
  12. How to Install Nessus on Kali Linux 2.0 step by step
  13. Nessus scan policies and report Tutorial for beginner
  14. Nessus Vulnerability Scanner Tutorial For beginner

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