Internet and OSI layer structures

• The figure below shows the layers of Internet and those of OSI

• In some cases (such as X.25) the ”physical network” of Internet reaches up to the network layer of OSI

• The Internet Protocol (IP) can be run on virtually any network, e.g. LAN, leased line, ATM, Frame Relay, X.25 or packet radio

IP

TCP

UDP

Application level protocols:

etc.

IEEE 802.3, FDDI, E1, ATM, Frame Relay etc.

application processes

media

OSI

Internet

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