Reference Models The OSI Reference Model The TCP/IP Reference Model

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Presentation transcript:

Reference Models The OSI Reference Model The TCP/IP Reference Model A Comparison of OSI and TCP/IP A Critique of the OSI Model and Protocols A Critique of the TCP/IP Reference Model

Reference Models The OSI reference model.

The TCP/IP reference model.

Protocols and networks in the TCP/IP model initially.

Comparing OSI and TCP/IP Models Concepts central to the OSI model Services Interfaces Protocols

A Critique of the OSI Model and Protocols Why OSI did not take over the world Bad timing Bad technology Bad implementations Bad politics

Bad Timing The apocalypse of the two elephants.

A Critique of the TCP/IP Reference Model Problems: Service, interface, and protocol not distinguished Not a general model Host-to-network “layer” not really a layer No mention of physical and data link layers Minor protocols deeply entrenched, hard to replace

Example Networks The Internet Connection-Oriented Networks: X.25, Frame Relay, and ATM Ethernet Wireless LANs: 802:11

The ARPANET (a) Structure of the telephone system. (b) Baran’s proposed distributed switching system.

The ARPANET (2) The original ARPANET design.

The ARPANET (3) Growth of the ARPANET (a) December 1969. (b) July 1970. (c) March 1971. (d) April 1972. (e) September 1972.

Internet Usage E-mail News Remote login File transfer Traditional applications (1970 – 1990) E-mail News Remote login File transfer

The ATM Reference Model

The ATM Reference Model (2) The ATM layers and sublayers and their functions.