Table of Contents
TCP Window Size, Checksum & Urgent Pointer
The window, checksum and urgent pointer are another important fields in TCP header. Each of these fields are 2 bytes long.
Window Size
Window size the most important part in the TCP header. This fields is used by the receiver to indicate to the sender, the amouth of data that it can accept. So, this field is very important for efficient data transfer and flow control.
Window size uses byte as a metric. If it is mentined that window size is 60k, then it means that receiver accept 60 kilobyte data. When the data transmitted reaches window value then sender expect another window value from the receiver along with the acknowledgement for the window just received.
Window size is not a random value. It is calculated with some parameters like below:
You can reach TCP Header article series below…
TCP Header Part – 1
TCP Header Part – 2
TCP Header Part – 3
TCP Header Part – 4
TCP Header Part – 5
Gokhan Kosem is a Network Engineer, Instructor and the Founder of IPCisco.com with 15+ years of experience in Cisco, Nokia, Huawei, Juniper, Linux, Service Provider Networks, Routing and Switching technologies.
He has worked on the backbone networks of major service providers and network vendors including Nortel, Alcatel-Lucent (Nokia) and has extensive hands-on experience with Cisco, Huawei, Juniper and Nokia networking technologies.
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Very useful information and very well explained.
Thank you.
Always welcome Ruben:) Good luck!
Well explained
Thank you
Thank a lot. Good luck!