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User:CONFIQ/ccna

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I want to dispense my knowledge on progress called encapsulation.

Let's say we have some data on 7th layer of OSI model, or 5th layer of TCP/IP model, the data has been created! On Transport_layer data gets his first header and depending on application layer header should be send as UDP or TCP. This is example of UDP header:

UDP Header
+ Bits 0 - 15 16 - 31
0 Source Port Destination Port
32 Length Checksum
64  
Data
 

more info on UDP. If it's TCP than header will look like this:

TCP Header
Bit offset Bits 0–3 4–7 8–15 16–31
0 Source port Destination port
32 Sequence number
64 Acknowledgment number
96 Data offset Reserved CWR ECE URG ACK PSH RST SYN FIN Window
128 Checksum Urgent pointer
160 Options (optional)
160/192+  
Data
 

more info on TCP.

data that goes through Transport layer is called segments.