Elements of Network Protocol Design

Elements of network protocol design, M.G. Gouda, Wiley

Recall that in digital computing systems, the rules can be expressed by algorithms and datastructures, raising the opportunity for hardware independence.

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Expressing the algorithms in a portable programming language, makes the protocol software operating system independent. The source code could be considered a protocol specification. This form of specification, however is not suitable for the parties involved.

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This book gives students and professionals alike both the understanding of fundamental principles and the practical guidance they need to develop successful protocol-based networking solutions. Retrieved from " https: All conflicting views should be taken into account, often by way of compromise, to progress to a draft proposal of the working group. This book gives students and professionals alike both the understanding of fundamental principles and the practical guidance they need to develop successful protocol-based networking solutions. Meyers Centennial Professor in Computing Science at the University of Texas at Austin and a leading researcher in distributed and concurrent computing. Typically, application software is built upon a robust data transport layer. Naming and Name Resolution.

For one thing, this would enforce a source on all parties and for another, proprietary software producers would not accept this. By describing the software interfaces of the modules on paper and agreeing on the interfaces, implementers are free to do it their way. This is referred to as source independence. By specifying the algorithms on paper and detailing hardware dependencies in an unambiguous way, a paper draft is created, that when adhered to and published, ensures interoperability between software and hardware.

Such a paper draft can be developed into a protocol standard by getting the approval of a standards organization. To get the approval the paper draft needs to enter and successfully complete the standardization process.

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This activity is referred to as protocol development. The members of the standards organization agree to adhere to the standard on a voluntary basis. Often the members are in control of large market-shares relevant to the protocol and in many cases, standards are enforced by law or the government, because they are thought to serve an important public interest, so getting approval can be very important for the protocol.

It should be noted though that in some cases protocol standards are not sufficient to gain widespread acceptance i. BSC is an early link-level protocol used to connect two separate nodes. It was originally not intended to be used in a multinode network, but doing so revealed several deficiencies of the protocol. In the absence of standardization, manufacturers and organizations felt free to 'enhance' the protocol, creating incompatible versions on their networks. In some cases, this was deliberately done to discourage users from using equipment from other manufacturers. There are more than 50 variants of the original bi-sync protocol.

One can assume, that a standard would have prevented at least some of this from happening. In some cases, protocols gain market dominance without going through a standardization process. Such protocols are referred to as de facto standards. De facto standards are common in emerging markets, niche markets, or markets that are monopolized or oligopolized. They can hold a market in a very negative grip, especially when used to scare away competition. From a historical perspective, standardization should be seen as a measure to counteract the ill-effects of de facto standards.

Standardization is therefore not the only solution for open systems interconnection. The IEEE controls many software and hardware protocols in the electronics industry for commercial and consumer devices.

Elements of Network Protocol Design

The ITU is an umbrella organization of telecommunication engineers designing the public switched telephone network PSTN , as well as many radio communication systems. For marine electronics the NMEA standards are used. International standards organizations are supposed to be more impartial than local organizations with a national or commercial self-interest to consider.

Standards organizations also do research and development for standards of the future. In practice, the standards organizations mentioned, cooperate closely with each other. The standardization process starts off with ISO commissioning a sub-committee workgroup. The workgroup issues working drafts and discussion documents to interested parties including other standards bodies in order to provoke discussion and comments. This will generate a lot of questions, much discussion and usually some disagreement on what the standard should provide and if it can satisfy all needs usually not.

All conflicting views should be taken into account, often by way of compromise, to progress to a draft proposal of the working group. The draft proposal is discussed by the member countries' standard bodies and other organizations within each country. Comments and suggestions are collated and national views will be formulated, before the members of ISO vote on the proposal. If rejected, the draft proposal has to consider the objections and counter-proposals to create a new draft proposal for another vote. After a lot of feedback, modification, and compromise the proposal reaches the status of a draft international standard , and ultimately an international standard.

The process normally takes several years to complete. The original paper draft created by the designer will differ substantially from the standard, and will contain some of the following 'features':. International standards are reissued periodically to handle the deficiencies and reflect changing views on the subject. A lesson learned from ARPANET , the predecessor of the Internet, was that standardization of protocols is not enough, [ citation needed ] because protocols also need a framework to operate. It is therefore important to develop a general-purpose, future-proof framework suitable for structured protocols such as layered protocols and their standardization.

This would prevent protocol standards with overlapping functionality and would allow clear definition of the responsibilities of a protocol at the different levels layers. In the OSI model , communicating systems are assumed to be connected by an underlying physical medium providing a basic and unspecified transmission mechanism.

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The layers above it are numbered from one to seven ; the n th layer is referred to as n -layer. Each layer provides service to the layer above it or at the top to the application process using the services of the layer immediately below it. The layers communicate with each other by means of an interface, called a service access point.

Corresponding layers at each system are called peer entities. To communicate, two peer entities at a given layer use an n -protocol, which is implemented by using services of the n-1 -layer. When systems are not directly connected, intermediate peer entities called relays are used. An address uniquely identifies a service access point.

The address naming domains need not be restricted to one layer, so it is possible to use just one naming domain for all layers. Connection-oriented networks are more suitable for wide area networks and connectionless networks are more suitable for local area networks. As a result, the IETF developed its own standardization process based on "rough consensus and running code". The standardization process is described by RFC Classification schemes for protocols usually focus on domain of use and function.

As an example of domain of use, connection-oriented protocols and connectionless protocols are used on connection-oriented networks and connectionless networks respectively. For an example of function consider a tunneling protocol , which is used to encapsulate packets in a high-level protocol, so the packets can be passed across a transport system using the high-level protocol. A layering scheme combines both function and domain of use.

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Despite the fact that the underlying assumptions of the layering schemes are different enough to warrant distinguishing the two, it is a common practice to compare the two by relating common protocols to the layers of the two schemes. Lists of network protocols.

Elements of network protocol design

The functionality of the layers has been described in the section on software layering and an overview of protocols using this scheme is given in the article on Internet protocols. The functionality of the layers has been described in the section on the future of standardization and an overview of protocols using this scheme is given in the article on OSI protocols. In networking equipment configuration, a term-of-art distinction is often drawn: The term "protocol" strictly refers to the transport layer, and the term "service" refers to protocols utilizing a "protocol" for transport.

Conformance to these port numbers is voluntary, so in content inspection systems the term "service" strictly refers to port numbers, and the term "application" is often used to refer to protocols identified through inspection signatures. It seems that Gouda doesn't really know much about Networking. Thus, he created his convoluted interpretation that nobody else uses or really understands so he can elevate himself on a pseudo-intellectual pedestal.

Kurose and Keith W. Previously he used Comer's books on Networking. Either of those choices is vastly superior than Gouda's offering. After reading the glowing reviews for this book, I purchased a copy. I would say that this book is pretty weak. He presents a lot of shallow arguments, but doesn't go into the details that one would expect.

Computer Networking Tutorial - 10 - What is a Protocol?

His coverage of the Internet protocols is not at all in depth. I had hoped to get a more detailed analysis of the protocols of the Internet. I also find his presentation for describing the "Abstract Protocol" language as vague and confusing, and the syntax is needlessly convoluted. Why does he need to use a 'box' symbol to separate different actions? Perhaps another symbol which actually appears on most keyboards would have been a better choice.

I used this book for my Computer Networks class that M. Gouda taught at the University of Texas. It was very straight-forward and easy to read. I learned a lot from the book. It starts off teaching basic network concepts and moves on to more complex issues at a good pace.

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Return to Book Page. Elements of Network Protocol Design 3. This book gives students and professionals alike both the understanding of fundamental principles and the practical guidance they need to develop successful protocol-based networking solutions. It provides Abstract Protocol notation AP , a useful formal notation for specifying network protocols, step-by-step guidance on designing all types of network protocols, from basic This book gives students and professionals alike both the understanding of fundamental principles and the practical guidance they need to develop successful protocol-based networking solutions.

It provides Abstract Protocol notation AP , a useful formal notation for specifying network protocols, step-by-step guidance on designing all types of network protocols, from basic routing and switching protocols to data compression and security protocols, detailed practical information on layered protocols and hierarchies, proven protocol-based solutions for many of today's most challenging networking problems, a concise presentation of the many protocols in the Internet, and more than exercises to test and refine your skills.

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