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OSI model

The Open Systems Interconnection ( OSI ) model is a reference model developed by the International Organization for Standardization (ISO) that "provides a common basis for the c...

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The Open Systems Interconnection (OSI) model is a reference model developed by the International Organization for Standardization (ISO) that "provides a common basis for the coordination of standards development for the purpose of systems interconnection."[2]

In the OSI reference model, the components of a communication system are distinguished in seven abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.[3]

The model describes communications from the physical implementation of transmitting bits across a transmission medium to the highest-level representation of data of a distributed application. Each layer has well-defined functions and semantics and serves a class of functionality to the layer above it and is served by the layer below it. Established, well-known communication protocols are decomposed in software development into the model's hierarchy of function calls.

The Internet protocol suite as defined in RFC 1122 and RFC 1123 is a model of networking developed contemporarily to the OSI model, and was funded primarily by the U.S. Department of Defense. It was the foundation for the development of the Internet. It assumed the presence of generic physical links and focused primarily on the software layers of communication, with a similar but much less rigorous structure than the OSI model.

In comparison, several networking models have sought to create an intellectual framework for clarifying networking concepts and activities, but none have been as successful as the OSI reference model in becoming the standard model for discussing and teaching networking in the field of information technology. The model allows transparent communication through equivalent exchange of protocol data units (PDUs) between two parties, through what is known as peer-to-peer networking (also known as peer-to-peer communication). As a result, the OSI reference model has not only become an important piece among professionals and non-professionals alike, but also in all networking between one or many parties, due in large part to its commonly accepted user-friendly framework.[4]

Communication in the OSI model (example with layers 3 to 5)

History

The development of the OSI model started in the late 1970s to support the emergence of the diverse computer networking methods that were competing for application in the large national networking efforts in the world (see OSI protocols and Protocol Wars). In the 1980s, the model became a working product of the Open Systems Interconnection group at the International Organization for Standardization (ISO). While attempting to provide a comprehensive description of networking, the model failed to garner reliance during the design of the Internet, which is reflected in the less prescriptive Internet Protocol Suite, principally sponsored under the auspices of the Internet Engineering Task Force (IETF).

In the early- and mid-1970s, networking was largely either government-sponsored (NPL network in the UK, ARPANET in the US, CYCLADES in France) or vendor-developed with proprietary standards, such as IBM's Systems Network Architecture and Digital Equipment Corporation's DECnet. Public data networks were only just beginning to emerge, and these began to use the X.25 standard in the late 1970s.[5][6]

The Experimental Packet Switched System in the UK c.1973–1975 identified the need for defining higher-level protocols.[5] The UK National Computing Centre publication, Why Distributed Computing, which came from considerable research into future configurations for computer systems,[7] resulted in the UK presenting the case for an international standards committee to cover this area at the ISO meeting in Sydney in March 1977.[8][9][10]

Beginning in 1977, the ISO initiated a program to develop general standards and methods of networking. A similar process evolved at the International Telegraph and Telephone Consultative Committee (CCITT, from French: Comité Consultatif International Téléphonique et Télégraphique). Both bodies developed documents that defined similar networking models. The British Department of Trade and Industry acted as the secretariat, and universities in the United Kingdom developed prototypes of the standards.[11]

The OSI model was first defined in raw form in Washington, D.C., in February 1978 by French software engineer Hubert Zimmermann, and the refined but still draft standard was published by the ISO in 1980.[9]

The drafters of the reference model had to contend with many competing priorities and interests. The rate of technological change made it necessary to define standards that new systems could converge to rather than standardizing procedures after the fact; the reverse of the traditional approach to developing standards.[12] Although not a standard itself, it was a framework in which future standards could be defined.[13]

In May 1983,[14] the CCITT and ISO documents were merged to form The Basic Reference Model for Open Systems Interconnection, usually referred to as the Open Systems Interconnection Reference Model, OSI Reference Model, or simply OSI model. It was published in 1984 by both the ISO, as standard ISO 7498, and the renamed CCITT (now called the Telecommunications Standardization Sector of the International Telecommunication Union or ITU-T) as standard X.200.

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 devices and software.

The concept of a seven-layer model was provided by the work of Charles Bachman at Honeywell Information Systems.[15] Various aspects of OSI design evolved from experiences with the NPL network, ARPANET, CYCLADES, EIN, and the International Network Working Group (IFIP WG6.1). In this model, a networking system was divided into layers. Within each layer, one or more entities implement its functionality. Each entity interacted directly only with the layer immediately beneath it and provided facilities for use by the layer above it.

The OSI standards documents are available from the ITU-T as the X.200 series of recommendations.[16] Some of the protocol specifications were also available as part of the ITU-T X series. The equivalent ISO/IEC standards for the OSI model were available from ISO. Not all are free of charge.[17]

OSI was an industry effort, attempting to get industry participants to agree on common network standards to provide multi-vendor interoperability.[18] It was common for large networks to support multiple network protocol suites, with many devices unable to interoperate with other devices because of a lack of common protocols. For a period in the late 1980s and early 1990s, engineers, organizations and nations became polarized over the issue of which standard, the OSI model or the Internet protocol suite, would result in the best and most robust computer networks.[9][19][20] However, while OSI developed its networking standards in the late 1980s,[21][22]TCP/IP came into widespread use on multi-vendor networks for internetworking.

The OSI model is still used as a reference for teaching and documentation;[23] however, the OSI protocols originally conceived for the model did not gain popularity. Some engineers argue the OSI reference model is still relevant to cloud computing.[24] Others say the original OSI model does not fit today's networking protocols and have suggested instead a simplified approach.[25][26]

Definitions

Communication protocols enable an entity in one host to interact with a corresponding entity at the same layer in another host. Service definitions, like the OSI model, abstractly describe the functionality provided to a layer N by a layer N−1, where N is one of the seven layers of protocols operating in the local host (with N=1 being the most basic layer, often represented at the bottom of a list).

At each level N, two entities at the communicating devices (layer N peers) exchange protocol data units (PDUs) by means of a layer N protocol. Each PDU contains a payload, called the service data unit (SDU), along with protocol-related headers or footers.

Data processing by two communicating OSI-compatible devices proceeds as follows:

  1. The data to be transmitted is composed at the topmost layer of the transmitting device (layer N) into a protocol data unit (PDU).
  2. The PDU is passed to layer N−1, where it is known as the service data unit (SDU).
  3. At layer N−1 the SDU is concatenated with a header, a footer, or both, producing a layer N−1 PDU. It is then passed to layer N−2.
  4. The process continues until reaching the lowermost level, from which the data is transmitted to the receiving device.
  5. At the receiving device the data is passed from the lowest to the highest layer as a series of SDUs while being successively stripped from each layer's header or footer until reaching the topmost layer, where the last of the data is consumed.

Standards documents

The OSI model was defined in ISO/IEC 7498 which consists of the following parts:

  • ISO/IEC 7498-1 The Basic Model
  • ISO/IEC 7498-2 Security Architecture
  • ISO/IEC 7498-3 Naming and addressing
  • ISO/IEC 7498-4 Management framework

ISO/IEC 7498-1 is also published as ITU-T Recommendation X.200.

Layer architecture

The recommendation X.200 describes seven layers, labelled 1 to 7. Layer 1 is the lowest layer in this model.

Layer 1: Physical layer

The physical layer is responsible for the transmission and reception of unstructured raw data between a device, such as a network interface controller, Ethernet hub, or network switch, and a physical transmission medium. It converts the digital bits into electrical, radio, or optical signals (analogue signals). Layer specifications define characteristics such as voltage levels, the timing of voltage changes, physical data rates, maximum transmission distances, modulation scheme, channel access method and physical connectors. This includes the layout of pins, voltages, line impedance, cable specifications, signal timing and frequency for wireless devices. Bit rate control is done at the physical layer and may define transmission mode as simplex, half duplex, and full duplex. The components of a physical layer can be described in terms of the network topology. Physical layer specifications are included in the specifications for the ubiquitous Bluetooth, Ethernet, and USB standards. An example of a less well-known physical layer specification would be for the CAN standard.

The physical layer also specifies how encoding occurs over a physical signal, such as electrical voltage or a light pulse. For example, a 1 bit might be represented on a copper wire by the transition from a 0-volt to a 5-volt signal, whereas a 0 bit might be represented by the transition from a 5-volt to a 0-volt signal. As a result, common problems occurring at the physical layer are often related to the incorrect media termination, EMI or noise scrambling, and NICs and hubs that are misconfigured or do not work correctly.

The data link layer provides node-to-node data transfer—a link between two directly connected nodes. It detects and possibly corrects errors that may occur in the physical layer. It defines the protocol to establish and terminate a connection between two physically connected devices. It also defines the protocol for flow control between them.

IEEE 802 divides the data link layer into two sublayers:[29]

  • Medium access control (MAC) layer – responsible for controlling how devices in a network gain access to a medium and permission to transmit data.
  • Logical link control (LLC) layer – responsible for identifying and encapsulating network layer protocols, and controls error checking and frame synchronization.

The MAC and LLC layers of IEEE 802 networks such as 802.3Ethernet, 802.11Wi-Fi, and 802.15.4Zigbee operate at the data link layer.

The Point-to-Point Protocol (PPP) is a data link layer protocol that can operate over several different physical layers, such as synchronous and asynchronous serial lines.

The ITU-TG.hn standard, which provides high-speed local area networking over existing wires (power lines, phone lines and coaxial cables), includes a complete data link layer that provides both error correction and flow control by means of a selective-repeatsliding-window protocol.

Security, specifically (authenticated) encryption, at this layer can be applied with MACsec.

Layer 3: Network layer

The network layer provides the functional and procedural means of transferring packets from one node to another connected in "different networks". A network is a medium to which many nodes can be connected, on which every node has an address and which permits nodes connected to it to transfer messages to other nodes connected to it by merely providing the content of a message and the address of the destination node and letting the network find the way to deliver the message to the destination node, possibly routing it through intermediate nodes. If the message is too large to be transmitted from one node to another on the data link layer between those nodes, the network may implement message delivery by splitting the message into several fragments at one node, sending the fragments independently, and reassembling the fragments at another node. It may, but does not need to, report delivery errors.

Message delivery at the network layer is not necessarily guaranteed to be reliable; a network layer protocol may provide reliable message delivery, but it does not need to do so.

A number of layer-management protocols, a function defined in the management annex, ISO 7498/4, belong to the network layer. These include routing protocols, multicast group management, network-layer information and error, and network-layer address assignment. It is the function of the payload that makes these belong to the network layer, not the protocol that carries them.[30]

Security, specifically (authenticated) encryption, at this layer can be applied with IPsec.

Layer 4: Transport layer

The transport layer provides the functional and procedural means of transferring variable-length data sequences from a source host to a destination host from one application to another across a network while maintaining the quality-of-service functions. Transport protocols may be connection-oriented or connectionless.

This may require breaking large protocol data units or long data streams into smaller chunks called "segments", since the network layer imposes a maximum packet size called the maximum transmission unit (MTU), which depends on the maximum packet size imposed by all data link layers on the network path between the two hosts. The amount of data in a data segment must be small enough to allow for a network-layer header and a transport-layer header. For example, for data being transferred across Ethernet, the MTU is 1500 bytes, the minimum size of a TCP header is 20 bytes, and the minimum size of an IPv4 header is 20 bytes, so the maximum segment size is 1500−(20+20) bytes, or 1460 bytes. The process of dividing data into segments is called segmentation; it is an optional function of the transport layer. Some connection-oriented transport protocols, such as TCP and the OSI connection-oriented transport protocol (COTP), perform segmentation and reassembly of segments on the receiving side; connectionless transport protocols, such as UDP and the OSI connectionless transport protocol (CLTP), usually do not.

The transport layer also controls the reliability of a given link between a source and destination host through flow control, error control, and acknowledgments of sequence and existence. Some protocols are state- and connection-oriented. This means that the transport layer can keep track of the segments and retransmit those that fail delivery through the acknowledgment hand-shake system. The transport layer will also provide the acknowledgement of the successful data transmission and sends the next data if no errors occurred.

Reliability, however, is not a strict requirement within the transport layer. Protocols like UDP, for example, are used in applications that are willing to accept some packet loss, reordering, errors or duplication. Streaming media, real-time multiplayer games and voice over IP (VoIP) are examples of applications in which loss of packets is not usually a fatal problem.

El protocolo de transporte orientado a la conexión OSI define cinco clases de protocolos de transporte en modo de conexión, que van desde la clase 0 (también conocida como TP0 y que ofrece las funcionalidades más básicas) hasta la clase 4 (TP4, diseñada para redes menos fiables, similares a Internet). La clase 0 no incluye recuperación de errores y se diseñó para su uso en capas de red que proporcionan conexiones sin errores. La clase 4 es la más similar a TCP, aunque TCP incluye funciones, como el cierre elegante, que OSI asigna a la capa de sesión. Asimismo, todas las clases de protocolos de transporte en modo de conexión OSI TP ofrecen transmisión de datos acelerada y preservación de los límites de los registros. Las características detalladas de las clases TP0-4 se muestran en la siguiente tabla: [ 31 ]

Una forma sencilla de visualizar la capa de transporte es compararla con una oficina de correos, que se encarga del envío y la clasificación del correo y los paquetes enviados. Una oficina de correos inspecciona únicamente el sobre exterior del correo para determinar su entrega. Las capas superiores pueden tener el equivalente a sobres dobles, como los servicios de presentación criptográfica que solo puede leer el destinatario. En términos generales, los protocolos de tunelización operan en la capa de transporte, como por ejemplo, el transporte de protocolos que no son IP, como SNA de IBM o IPX de Novell , a través de una red IP, o el cifrado de extremo a extremo con IPsec . Si bien la encapsulación de enrutamiento genérico (GRE) podría parecer un protocolo de capa de red, si la encapsulación de la carga útil se realiza únicamente en el punto final, GRE se asemeja más a un protocolo de transporte que utiliza encabezados IP, pero contiene tramas completas de la capa 2 o paquetes de la capa 3 para entregar al punto final. L2TP transporta tramas PPP dentro de los segmentos de transporte.

Aunque no se desarrollaron bajo el Modelo de Referencia OSI y no se ajustan estrictamente a la definición OSI de la capa de transporte, el Protocolo de Control de Transmisión (TCP) y el Protocolo de Datagramas de Usuario (UDP) del conjunto de protocolos de Internet se clasifican comúnmente como protocolos de capa 4 dentro de OSI.

Transport Layer Security (TLS) does not strictly fit inside the model either. It contains characteristics of the transport and presentation layers.[32][33]

Layer 5: Session layer

The session layer creates the setup, controls the connections, and ends the teardown, between two or more computers, which is called a "session". Common functions of the session layer include user logon (establishment) and user logoff (termination) functions. Including this matter, authentication methods are also built into most client software, such as FTP Client and NFS Client for Microsoft Networks. Therefore, the session layer establishes, manages and terminates the connections between the local and remote applications. The session layer also provides for full-duplex, half-duplex, or simplex operation, and establishes procedures for checkpointing, suspending, restarting, and terminating a session between two related streams of data, such as an audio and a video stream in a web-conferencing application. Therefore, the session layer is commonly implemented explicitly in application environments that use remote procedure calls.

Layer 6: Presentation layer

The presentation layer establishes data formatting and data translation into a format specified by the application layer during the encapsulation of outgoing messages while being passed down the protocol stack, and possibly reversed during the deencapsulation of incoming messages when being passed up the protocol stack. For this very reason, outgoing messages during encapsulation are converted into a format specified by the application layer, while the conversion for incoming messages during deencapsulation are reversed.

The presentation layer handles protocol conversion, data encryption, data decryption, data compression, data decompression, incompatibility of data representation between operating systems, and graphic commands. The presentation layer transforms data into the form that the application layer accepts, to be sent across a network. Since the presentation layer converts data and graphics into a display format for the application layer, the presentation layer is sometimes called the syntax layer.[34] For this reason, the presentation layer negotiates the transfer of syntax structure through the Basic Encoding Rules of Abstract Syntax Notation One (ASN.1), with capabilities such as converting an EBCDIC-coded text file to an ASCII-coded file, or serialization of objects and other data structures from and to XML.[4]

Layer 7: Application layer

The application layer is the layer of the OSI model that is closest to the end user, which means both the OSI application layer and the user interact directly with a software application that implements a component of communication between the client and server, such as File Explorer and Microsoft Word. Such application programs fall outside the scope of the OSI model unless they are directly integrated into the application layer through the functions of communication, as is the case with applications such as web browsers and email programs. Other examples of software are Microsoft Network Software for File and Printer Sharing and Unix/Linux Network File System Client for access to shared file resources.

Application-layer functions typically include file sharing, message handling, and database access, through the most common protocols at the application layer, known as HTTP, FTP, SMB/CIFS, TFTP, and SMTP. When identifying communication partners, the application layer determines the identity and availability of communication partners for an application with data to transmit. The most important distinction in the application layer is the distinction between the application entity and the application. For example, a reservation website might have two application entities: one using HTTP to communicate with its users, and one for a remote database protocol to record reservations. Neither of these protocols have anything to do with reservations. That logic is in the application itself. The application layer has no means to determine the availability of resources in the network.[4]

Cross-layer functions

Cross-layer functions are services that are not tied to a given layer, but may affect more than one layer.[35] Some orthogonal aspects, such as management and security, involve all of the layers (See ITU-T X.800 Recommendation[36]). These services are aimed at improving the CIA triad—confidentiality, integrity, and availability—of the transmitted data. Cross-layer functions are the norm, in practice, because the availability of a communication service is determined by the interaction between network design and network management protocols.

Specific examples of cross-layer functions include the following:

  • Security service (telecommunication)[36] as defined by ITU-T X.800 recommendation.
  • Management functions, i.e. functions that permit to configure, instantiate, monitor, terminate the communications of two or more entities: there is a specific application-layer protocol, Common Management Information Protocol (CMIP) and its corresponding service, Common Management Information Service (CMIS), they need to interact with every layer in order to deal with their instances.
  • Multiprotocol Label Switching (MPLS), ATM, and X.25 are 3a protocols. OSI subdivides the Network Layer into three sublayers: 3a) Subnetwork Access, 3b) Subnetwork Dependent Convergence and 3c) Subnetwork Independent Convergence.[37] It was designed to provide a unified data-carrying service for both circuit-based clients and packet-switching clients which provide a datagram-based service model. It can be used to carry many different kinds of traffic, including IP packets, as well as native ATM, SONET, and Ethernet frames. Sometimes one sees reference to a Layer 2.5.
  • Cross MAC and PHY Scheduling is essential in wireless networks because of the time-varying nature of wireless channels. By scheduling packet transmission only in favourable channel conditions, which requires the MAC layer to obtain channel state information from the PHY layer, network throughput can be significantly improved and energy waste can be avoided.[38]

Programming interfaces

Neither the OSI Reference Model, nor any OSI protocol specifications, outline any programming interfaces, other than deliberately abstract service descriptions. Protocol specifications define a methodology for communication between peers, but the software interfaces are implementation-specific.

For example, the Network Driver Interface Specification (NDIS) and Open Data-Link Interface (ODI) are interfaces between the media (layer 2) and the network protocol (layer 3).

Comparison to other networking suites

The table below presents a list of OSI layers, the original OSI protocols, and some approximate modern matches. This correspondence is rough: the OSI model contains idiosyncrasies not found in later systems such as the IP stack in modern Internet.[26]

Comparison with TCP/IP model

The design of protocols in the TCP/IP model of the Internet does not concern itself with strict hierarchical encapsulation and layering. RFC 3439 contains a section entitled "Layering considered harmful".[48] TCP/IP does recognize four broad layers of functionality which are derived from the operating scope of their contained protocols: the scope of the software application; the host-to-host transport path; the internetworking range; and the scope of the direct links to other nodes on the local network.[49]

Despite using a different concept for layering than the OSI model, these layers are often compared with the OSI layering scheme in the following manner:

  • The Internet application layer maps to the OSI application layer, presentation layer, and most of the session layer.
  • The TCP/IP transport layer maps to the graceful close function of the OSI session layer as well as the OSI transport layer.
  • The internet layer performs functions as those in a subset of the OSI network layer.
  • The link layer corresponds to the OSI data link layer and may include similar functions as the physical layer, as well as some protocols of the OSI's network layer.

These comparisons are based on the original seven-layer protocol model as defined in ISO 7498, rather than refinements in the internal organization of the network layer.

El conjunto de protocolos OSI especificado como parte del proyecto OSI fue considerado por muchos como demasiado complicado e ineficiente, y en gran medida imposible de implementar. [ 50 ] Adoptando el enfoque de "actualización completa" para las redes, especificó la eliminación de todos los protocolos de red existentes y su reemplazo en todas las capas de la pila. Esto dificultó la implementación y generó resistencia por parte de muchos proveedores y usuarios con importantes inversiones en otras tecnologías de red. Además, los protocolos incluían tantas características opcionales que las implementaciones de muchos proveedores no eran interoperables. [ 50 ]

Aunque el modelo OSI todavía se menciona con frecuencia, el conjunto de protocolos de Internet se ha convertido en el estándar para las redes. El enfoque pragmático de TCP/IP hacia las redes informáticas y las implementaciones independientes de protocolos simplificados lo convirtieron en una metodología práctica. [ 50 ] Algunos protocolos y especificaciones en la pila OSI siguen en uso, un ejemplo de ello es IS-IS , que se especificó para OSI como ISO/IEC 10589:2002 y se adaptó para su uso en Internet con TCP/IP como RFC 1142. [ 51 ]

Véase también

Referencias

  1. ↑ "X.225 : Tecnología de la información – Interconexión de sistemas abiertos – Protocolo de sesión orientado a la conexión: Especificación del protocolo" . Archivado del original el 1 de febrero de 2021. Recuperado el 10 de marzo de 2023 . 
  2. ↑ ISO/IEC 7498-1:1994 Tecnología de la información — Interconexión de sistemas abiertos — Modelo de referencia básico: El modelo básico . ISO . Junio ​​de 1999. Introducción . Consultado el 26 de agosto de 2022 .
  3. ↑ "¿Qué es el modelo OSI?" . Forcepoint . 10 de agosto de 2018. Archivado del original el 24 de marzo de 2022 . Consultado el 20 de mayo de 2022 .
  4. 1 2 3 Tomsho, Greg (2016). Guía de fundamentos de redes (7.ª ed.). Cengage . Recuperado el 3 de abril de 2022 . 
  5. 1 2 Davies, Howard; Bressan, Beatrice (26 de abril de 2010). Una historia de las redes internacionales de investigación: las personas que lo hicieron posible . John Wiley & Sons. págs. 2–3 . ISBN  978-3-527-32710-2.
  6. ↑Roberts, Dr. Lawrence G. (November 1978). "The Evolution of Packet Switching"(PDF). IEEE Invited Paper. Retrieved 26 February 2022.
  7. ↑Down, Peter John; Taylor, Frank Edward (1976). Why distributed computing?: An NCC review of potential and experience in the UK. NCC Publications. ISBN 9780850121704.
  8. ↑Radu, Roxana (2019). "Revisiting the Origins: The Internet and its Early Governance". Negotiating Internet Governance. Oxford University Press. pp. 43–74. doi:10.1093/oso/9780198833079.003.0003. ISBN 9780191871405.
  9. 123Andrew L. Russell (30 July 2013). "OSI: The Internet That Wasn't". IEEE Spectrum. Vol. 50, no. 8.
  10. ↑"Interview of Donald Davies by James L. Pelkey"(PDF). Computer History Museum. p. 7-9. Davies: Well, it was Hubert Zimmerman who really pushed that along, but there was one British man who I think invented the term 'open systems' actually, MacGregor or something like that. You probably won't hear of him because he's not a very forceful person, but he was involved a lot in the pressure to get OSI started. I think he invented the term 'open systems,' but Hubert Zimmerman was the real driving force.
  11. ↑Campbell-Kelly, Martin; Garcia-Swartz, Daniel D (2013). "The History of the Internet: The Missing Narratives". Journal of Information Technology. 28 (1): 18–33. doi:10.1057/jit.2013.4. ISSN 0268-3962. S2CID 41013. SSRN 867087.
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  19. ↑Russell, Andrew L. (July–September 2006). "Rough Consensus and Running Code' and the Internet-OSI Standards War"(PDF). IEEE Annals of the History of Computing. 28 (3): 48–61. Bibcode:2006IAHC...28c..48R. doi:10.1109/MAHC.2006.42.
  20. ↑"Standards Wars"(PDF). 2006.
  21. ↑Network World. IDG Network World Inc. 15 February 1988.
  22. ↑Network World. IDG Network World Inc. 10 October 1988.
  23. ↑Shaw, Keith (22 October 2018). "The OSI model explained: How to understand (and remember) the 7 layer network model". Network World. Archived from the original on 4 October 2020. Retrieved 16 May 2020.
  24. ↑"An OSI Model for Cloud". Cisco Blogs. 24 February 2017. Retrieved 16 May 2020.
  25. ↑Taylor, Steve; Metzler, Jim (23 September 2008). "Why it's time to let the OSI model die". Network World. Retrieved 16 May 2020.
  26. 12Crawford, JB (27 March 2021). "The actual OSI model".
  27. ↑"Windows Network Architecture and the OSI Model". Microsoft Documentation. Retrieved 24 June 2020.
  28. ↑"What is a packet? | Network packet definition". Cloudflare.
  29. ↑"5.2 RM description for end stations". IEEE Std 802-2014, IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture. ieee. doi:10.1109/IEEESTD.2014.6847097. ISBN 978-0-7381-9219-2.
  30. ↑International Organization for Standardization (15 November 1989). "ISO/IEC 7498-4:1989 – Information technology – Open Systems Interconnection – Basic Reference Model: Management framework". ISO Standards Maintenance Portal. ISO Central Secretariat. Retrieved 16 November 2024.
  31. ↑"ITU-T Recommendation X.224 (11/1995) ISO/IEC 8073, Open Systems Interconnection – Protocol for providing the connection-mode transport service". ITU.
  32. ↑Hooper, Howard (2012). CCNP Security VPN 642-648 Official Cert Guide (2 ed.). Cisco Press. p. 22. ISBN 9780132966382.
  33. ↑Spott, Andrew; Leek, Tom; et al. "What layer is TLS?". Information Security Stack Exchange.
  34. ↑Grigonis, Richard (2000). "Open Systems Interconnection (OSI) Model". Computer Telephony Encyclopedia. New York: CMP Books. p. 331. ISBN 978-1-929629-51-0. OCLC 48138823.
  35. ↑Mao, Stephen (2009). "Chapter 8: Fundamentals of communication networks". In Wyglinski, Alexander; Nekovee, Maziar; Hou, Thomas (eds.). Cognitive Radio Communications and Networks: Principles and Practice. Elsevier. p. 201. ISBN 978-0-08-087932-1. OCLC 635292718, 528550718.Partial preview at Google Books.
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  37. ↑Hegering, Heinz-Gerd; Abeck, Sebastian; Neumair, Bernhard (1999). "Fundamental Structures of Networked Systems". Integrated management of networked systems: concepts, architectures, and their operational application. San Francisco, Calif.: Morgan Kaufmann. p. 54. ISBN 978-1-55860-571-8. OCLC 1341886747– via Internet Archive.
  38. ↑Miao, Guowang; Song, Guocong (2014). Energy and spectrum efficient wireless network design. New York: Cambridge University Press. ISBN 978-1-139-62677-4. OCLC 898138775– via Internet Archive.
  39. ↑ "Recomendación ITU-T Q.1400 (03/1993) ] , Marco arquitectónico para el desarrollo de protocolos de señalización y OA&M utilizando conceptos OSI " . ITU. págs. 4, 7. 
  40. ↑ "ITU-T X.227 (04/1995)" . Recomendaciones de la UIT-T . 10 de abril de 1995. Consultado el 12 de julio de 2024 .
  41. ↑ "ITU-T X.217" . Interconexión de sistemas abiertos . 10 de abril de 1995. Consultado el 12 de julio de 2024 .
  42. ↑ "X.700: Marco de gestión para la interconexión de sistemas abiertos (OSI) para aplicaciones CCITT" . UIT . 10 de septiembre de 1992. Consultado el 12 de julio de 2024 .
  43. ↑ "X.711" . Open Systems Interconnection . 15 de mayo de 2014. Consultado el 12 de julio de 2024 .
  44. ^ "ISO/IEC 9596-1:1998(es)" . ISO . Consultado el 12 de julio de 2024 .
  45. ^ "ISO/IEC 9596-2:1993(es)" . ISO . Consultado el 12 de julio de 2024 .
  46. 1 2 "Manual de tecnología de interconexión de redes: conceptos básicos de interconexión de redes [ Interconexión de redes ] " . Cisco . 15 de enero de 2014. Consultado el 14 de agosto de 2015 .
  47. ↑ "Especificación 3GPP: 36.300" . 3gpp.org . Consultado el 14 de agosto de 2015 .
  48. ↑ "La superposición de capas se considera perjudicial" . Algunas directrices y filosofía de la arquitectura de Internet . IETF . Diciembre de 2002. sec. 3. doi : 10.17487/RFC3439 . RFC 3439. Consultado el 25 de abril de 2022 . 
  49. ↑ Walter Goralski (2009). La red ilustrada: cómo funciona TCP/IP en una red moderna (PDF) . Morgan Kaufmann . pág. 26. ISBN  978-0123745415.
  50. 1 2 3 Tanenbaum, Andrew S. (2003). Redes informáticas . Upper Saddle River, NJ: Prentice Hall PTR. ISBN 978-0-13-066102-9OCLC 50166590​​ 
  51. ↑ "Protocolo de enrutamiento intradominio OSI IS-IS" . IETF Datatracker . IETF . doi : 10.17487/RFC1142 . RFC 1142. Consultado el 12 de julio de 2024 .

Lecturas adicionales

  • Day, John D. (2008). Patrones en la arquitectura de redes: Un regreso a los fundamentos . Upper Saddle River, NJ: Pearson Education. ISBN 978-0-13-225242-3OCLC 213482801​​ 
  • Dickson, Gary; Lloyd, Alan (1992). Interconexión de sistemas abiertos . Nueva York: Prentice Hall. ISBN 978-0-13-640111-7OCLC 1245634475 – vía Internet Archive . 
  • Piscitello, David M.; Chapin, A. Lyman (1993). Redes de sistemas abiertos  : TCP/IP y OSI . Reading, Mass.: Addison-Wesley Pub. Co. ISBN 978-0-201-56334-4OCLC 624431223 – vía Internet Archive . 
  • Rose, Marshall T. (1990). El libro abierto: una perspectiva práctica sobre OSI . Englewood Cliffs, NJ: Prentice Hall. ISBN 978-0-13-643016-2OCLC 1415988401 – vía Internet Archive . 
  • Russell, Andrew L. (2014). Estándares abiertos y la era digital: historia, ideología y redes . Cambridge University Press. ISBN 978-1-139-91661-5OCLC 881237495​​ Vista previa parcial en Google Libros .
  • Zimmermann, Hubert (abril de 1980). "Modelo de referencia OSI: el modelo ISO de arquitectura para la interconexión de sistemas abiertos". IEEE Transactions on Communications . 28 (4): 425– 432. CiteSeerX 10.1.1.136.9497 . doi : 10.1109/TCOM.1980.1094702 . ISSN 0090-6778 . OCLC 5858668034. S2CID 16013989 .    
  • "Arquitectura de red de Windows y el modelo OSI" . Microsoft Learn . 2 de febrero de 2024. Consultado el 12 de julio de 2024 .
  • "Norma ISO/IEC 7498-1:1994 - Definición de servicio para el elemento de servicio de control de asociación" . Portal de mantenimiento de normas ISO . ISO . Consultado el 12 de julio de 2024 . ( Documento PDF dentro del archivo ZIP ) (Requiere cookies HTTP para aceptar el acuerdo de licencia)
  • "Recomendación X.200 de la UIT" . Unión Internacional de Telecomunicaciones . 2 de junio de 1998. Consultado el 12 de julio de 2024 .
  • "Arquitecturas y diagramas de flujo para el cambio de información con tecnología de Google App Engine" . infchg.appspot.com . Archivado del original el 26 de mayo de 2012.
  • Manual de tecnología de interconexión de redes . docwiki.cisco.com . 10 de julio de 2015. Archivado del original el 6 de septiembre de 2015.
  • EdXD; Saikot, Mahmud Hasan (25 de noviembre de 2021). "Explicación de las 7 capas del modelo OSI" . ByteXD . Consultado el 12 de julio de 2024 .