TCP/IP model: Difference between revisions

Revision as of 07:31, 27 March 2012

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The IETF protocol development effort is not concerned with strict layering, and some of its protocols may not fit cleanly into the OSI model. These conflicts, however, are apparent also in the original OSI model, ISO 7498, when not considering the annexes to this model (e.g., ISO 7498/4 Management Framework), or the ISO 8648 Internal Organization of the Network layer (IONL). When the IONL and Management Framework documents are considered, the ICMP and IGMP are neatly defined as layer management protocols for the network layer. In like manner, the IONL provides a structure for "subnetwork dependent convergence facilities" such as [[Address Resolution Protocol|ARP]] and [[Reverse Address Resolution Protocol|RARP]].

IETF protocols can be encapsulated recursively, as demonstrated by tunneling protocols such as [[Generic Routing Encapsulation]] (GRE). WhileGRE basicuses OSIthe documentssame domechanism notthat considerOSI tunneling,uses there is some concept offor tunneling in yet another extension toat the OSI architecture, specifically the transportnetwork 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.

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