OSI Model

OSI Model applied on TCP/IP

5 App
4 Transport  (segment TCP,UDP: port)
2 Network    (packets IP)
1 Link       (frames)
0 Physical   (bits)

http://upload.wikimedia.org/wikipedia/commons/c/c4/IP_stack_connections.svg

http://upload.wikimedia.org/wikipedia/commons/3/3b/UDP_encapsulation.svg

More info

• http://www.infocellar.com/networks/osi-model.htm
• http://www.vlsm-calc.net/models.php

• http://en.wikipedia.org/wiki/TCP/IP_model
• http://en.wikipedia.org/wiki/Encapsulation_%28networking%29

OSI #	OSI Layer Name	TCP/IP #	TCP/IP Layer Name	Encapsulation Units	TCP/IP Protocols
7	Application	4	Application	data	FTP, HTTP, POP3, IMAP, telnet, SMTP, DNS, TFTP
6	Presentation			data
5	Session			data
4	Transport	3	Transport	segments	TCP, UDP
3	Network	2	Internet	packets	IP
2	Data Link	1	Network Access	frames
1	Physical			bits