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OSI Model

TCP/UDP is on Transport Layer. Ethernet is on Data Link Layer. HTTP,FTP and many others are on Application Layer. Presentation Layer and Session Layer are mainly outdated. Ports belong to Transport Layer.

About Author

Mathias Bothe To my job profile

I am Mathias, born 40 years ago in Heidelberg, Germany. Today I am living in Munich and Stockholm. I am a passionate IT freelancer with more than 16 years experience in programming, especially in developing web based applications for companies that range from small startups to the big players out there. I am founder of, creator of the security service platform BosyProtect© and initiator of several other software projects.