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The Air Force Office of Special Investigations (OSI or AFOSI) [5] is a U.S. federal law enforcement agency that reports directly to the Secretary of the Air Force.OSI is also a U.S. Air Force field operating agency under the administrative guidance and oversight of the Inspector General of the Department of the Air Force.
OSI had two major components: an abstract model of networking, called the Basic Reference Model or seven-layer model, and a set of specific protocols. The OSI reference model was a major advance in the standardisation of network concepts. It promoted the idea of a consistent model of protocol layers, defining interoperability between network ...
This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model.This list is not exclusive to only the OSI protocol family.Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.
OSI model Layer Protocol data unit (PDU) Function [3]; Host layers 7 Application: Data: High-level protocols such as for resource sharing or remote file access, e.g. HTTP. 6
The OSI model defines the application layer as only the interface responsible for communicating with host-based and user-facing applications. [10] OSI then explicitly distinguishes the functionality of two additional layers, the session layer and presentation layer , as separate levels below the application layer and above the transport layer.
The Office of Special Investigations (OSI) of the U.S Justice Department was created in 1979 to identify and expel, from the United States, those who assisted Nazis in persecuting "any person because of race, religion, national origin, or political opinion."
Within the service layering semantics of the OSI network architecture, the presentation layer responds to service requests from the application layer and issues service requests to the session layer through a unique presentation service access point (PSAP).
In practice, from 1995 interest in OSI implementations declined, and worldwide the deployment of standards-based networking services since have been predominantly based on the Internet protocol suite. [7] However, the Defense Messaging System continued to be based on the OSI protocols X.400 and X.500, due to their integrated security capabilities.