Documentation of Social Netwroking Site Like ORKUT

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http://www.slideshare.net/AbhijeetKalsi/aurkut-a-social-networking-website

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OSI MODEL [Computer Networks]

The Open Systems Interconnection model (OSI model) was a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a way of sub-dividing a communications system into smaller parts called layers.The OSI Model is a model that illustrates how data communications should take place.

It segregates the process into seven group of Layers given above..........

1) Physical Layer : Physical Layer is responsible for transmitting row bit stream over the physical cable. The physical layer defines the hardware items such as cables, cards, voltages etc.

2) Data Link Layer : Data link layer is responsible for controlling the error between adjacent nodes and transfer the frames to other computer via physical layer. Data link layer is used by hubs and switches for their operation.

3) Network Layer : This layer is responsible for translating the logical network address and names into their physical address ( MAC address). This layer is also responsible for addressing, determining routes for sending and managing network problems such as packet switching, data congestion and routines

4) Transport Layer : This layer is responsible for end-to-end delivers of messages between the networked hosts. It first divides the streams of data into chunks or packets before transmission and then the receiving computer re-assembles the packets. It also guarantee error free data delivery without loss or duplications.Protocols found at this layer include TCP, UDP.

5) Session Layer : This layer is responsible for establishing the process-to-process communication between the host in the network. This layer is responsible for establishing and ending the sessions across the network. The interactive login is an example of services provided by this layer in which the connective are re-connected in care of any interruption

6) Presentation Layer : The Presentation layer is responsible for protocol conversion, Encryption and compression should be Presentation Layer functions. This layer makes the communications between two host possible.

7) Application Layer : The application layer provider different services to the application. Example of services provided by this layer are file transfer, electronic messaging e-mail, virtual terminal access and network management. This is the layer with which the user interacts.

At Last I would give You a Tip to Remember these 7 Layers.....

How to remember the layer of OSI model?

Ans: The easiest way to remember use the mnemonic

"All people seem To need Data Processing"

@Gaurav Kapoor [VSoftTechnologies]

SDLC- System Development Life Cycle (SDLC)

SDLC is the process of developing information systems through investigation, analysis, design, implementation and maintenance. SDLC is also known as information systems development or application development. It is also known as Waterfall Model.

The software development life cycle (SDLC) is the entire process of formal, logical steps taken to develop a software product. The phases of SDLC can vary somewhat but generally include the following

SDLC is a System Development Life Cycle or Software Development Life Cycle.SDLC is the process of software development. This is the simplest definition of SDLC. There are so many methodologies which are involved in SDLC. The important stages are project planning, requirement gathering/analysis, designing, coding, testing and maintenance.

The six stages of SDLC.

The stages of the SDLC are designed to depend on one another, taking the outputs from the previous stage, adding additional effort, and producing results that leverage the previous stage effort.

Planning

Planning stage is used to establish the basic project structure and plan, feasibility study such as economical, operational, and technical, quality assurance, and risks associated with the project, and describe appropriate management and technical approaches.

Requirement Analysis

The objective of requirement analysis is to determine where the problem is and how to fix it. This phase is also known as Feasibility study. This steps includes breaking down the system in different parts and drawing diagrams to analyze the situation, analyzing project goals, breaking down what needs to be created and attempting to appoint users so that definite requirements can be defined. The development team examines the need for possible software in the given system. At the end of the feasibility study, the team furnishes a document that holds the different specific recommendations for the candidate system.

Designing

In this phase of software development process, the overall software’s structure and layouts are designed. The design stage takes its initial inputs from the approved requirements document. In this phase, in terms of the client/server technology, the number of layers needed for the package architecture, the database design, the data structure design etc are all defined. Thus, an overall software development model is created. So, analysis and designing is very essential in the entire development cycle. The output of this stage describes the new system as a collection of modules.

Coding

The actual programming code is generated during this stage. If the design is performed in a detailed manner, code generation can be accomplished without much complication. Programming tools like compilers, interpreters, debuggers etc are used to generate the code. Different high level programming languages such as C, C++, Pascal, Java, and PHP are used for coding. The programming language is chosen with respect to the type of application.

Testing

Once the coding is done, the software program testing begins. Different testing methodologies are available to fix the bugs that were committed during the previous phases. Different testing tools and methodologies are already available but some companies build their own testing tools that are tailor made for their own development operations.

Maintenance

The maintenance of software is an important aspect of SDLC. The software will definitely undergo change once it is delivered to the customer. Change could happen because of some unexpected input of values into the system/software or the changes in the system could directly affect the software operations. Sometimes new changes are implemented which requires the system updates.

The learning above has been from my readings on the web, and from the various reputed software companies in India. If you feel that I have missed anything, please feel free to share your feedbac

Computer Netwroks Media Guided & Unguided

Kindly Visit This Link

" http://fcit.usf.edu/network/chap4/chap4.htm " click here