Adds pdf notes.

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Tanmay 2022-08-17 19:53:17 +01:00
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@ -152,6 +152,7 @@ Steps 1 and 2 establish and acknowledge the sequence number for one direction. S
#### TCP header
![TCP header](https://networklessons.com/wp-content/uploads/2015/07/tcp-header.png)
The fields in a TCP header are:
* `Source port`: this is a 16 bit field that specifies the port number of the sender.

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