TCP/IP model: Difference between revisions

Revision as of 02:55, 25 March 2012

Revision as of 02:59, 25 March 2012

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IETF protocols can be encapsulated recursively, as demonstrated by tunneling protocols such as [[Generic Routing Encapsulation]] (GRE). While basic OSI documents do not consider tunneling, there is some concept of tunneling in yet another extension to the OSI architecture, specifically the transport layer gateways within the International Standardized Profile framework.<ref>[http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=30726 Framework and taxonomy of International Standardized Profiles], ISO 10000, October 1998</ref> The associated OSI development effort, however, has been abandoned given the overwhelming adoption of TCP/IP protocols.

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==Layer names and number of layers in the literature==

The following table shows the layer names and the number of layers of networking models presented in [[request for comments|RFCs]] and textbooks in widespread use in today's university computer networking courses. An evolution can be observed from the original three and four layer models towards a five layer reference model.

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