COMPUTER NETWORKS

What is Computer Networks?

  A computer network is a telecommunication channel through which we can share our data. It is also called data network. The best example of a computer network is Internet. Computer network does not mean a system with the control unit and other systems as its slave. It is called a distributed system A network …

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What is Line Configuration in Computer Networks?

Line Configuration The network is a connection made through connection links between two or more devices. Devices can be a computer, printer or any other device that is capable of sending and receiving data. There are two ways to connect the devices: Point-to-Point connection Multipoint connection Point-To-Point Connection It is a protocol which is used as …

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What is Transmission Modes in Computer Networks?

What is Transmission Modes in Computer Networks? Transmission mode means transferring data between two devices. It is also called communication mode. These modes direct the direction of flow of information. There are three types of the transmission mode. They are : Simplex Mode Half duplex Mode Full duplex Mode SIMPLEX Mode In this type of …

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Connection Oriented and Connectionless Services In Computer Networks

These are the two services given by the layers to layers above them. These services are : Connection Oriented Service Connectionless Services Connection Oriented Services There is a sequence of operation to be followed by the users of connection oriented service. These are : Connection is established Information is sent Connection is released In connection …

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Reference Models in Communication Networks

The most important reference models are : OSI reference model. TCP/IP reference model. Introduction to ISO-OSI Model: There are many users who use computer network and are located all over the world. To ensure national and worldwide data communication ISO (ISO stands for International Organization of Standardization.) developed this model. This is called a model …

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ISO/OSI Model in Communication Networks

Communication Networks There are n numbers of users who use computer network and are located over the world. So to ensure, national and worldwide data communication, systems must be developed which are compatible to communicate with each other. ISO has developed this. ISO stands for the International organization of Standardization. This is called a model …

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PHYSICAL Layer – OSI Model In Computer Networks

Physical layer is the lowest layer of all. It is responsible for sending bits from one computer to another. This layer is not concerned with the meaning of the bits and deals with the physical connection to the network and with transmission and reception of signals. This layer defines electrical and physical details represented as …

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DATA LINK Layer – OSI Model In Computer Networks

Data link layer is most reliable node to node delivery of data. It forms frames from the packets that are received from network layer and gives it to physical layer. It also synchronizes the information which is to be transmitted over the data. Error controlling is easily done. The encoded data are then passed to …

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Transport Layer – OSI Model In Computer Networks

The main aim of transport layer is to be delivered the entire message from source to destination. Transport layer ensures whole message arrives intact and in order, ensuring both error control and flow control at the source to destination level. It decides if data transmission should be on parallel path or single path Transport layer …

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Session Layer – OSI Model In Computer Networks

Its main aim is to establish, maintain and synchronize the interaction between communicating systems. Session layer manages and synchronize the conversation between two different applications. Transfer of data from one destination to another session layer streams of data are marked and are resynchronized properly, so that the ends of the messages are not cut prematurely …

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Presentation Layer OSI Model In Computer Networks

Presentation Layer OSI Model In Computer Networks   The primary goal of this layer is to take care of the syntax and semantics of the information exchanged between two communicating systems. Presentation layer takes care that the data is sent in such a way that the receiver will understand the information (data) and will be able …

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Application Layer – OSI Model In Computer Network

Application Layer OSI Model It is the top most layer of OSI Model. Manipulation of data (information) in various ways is done in this layer which enables user or software to get access to the network. Some services provided by this layer includes: E-Mail, transferring of files, distributing the results to user, directory services, network …

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The TCP/IP Reference Model In Computer Network

TCP IP Reference Model TCP/IP means Transmission Control Protocol and Internet Protocol. It is the network model used in the current Internet architecture as well. Protocols are set of rules which govern every possible communication over a network. These protocols describe the movement of data between the source and destination or the internet. These protocols …

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Comparison of OSI (Open System Interconnection) Reference Model and TCP/IP Reference Model

There are some following major differences between OSI Reference Model and TCP/IP Reference Model, with diagrammatic comparison below. OSI(Open System Interconnection) TCP/IP(Transmission Control Protocol / Internet Protocol) 1. OSI is a generic, protocol independent standard, acting as a communication gateway between the network and end user. 1. TCP/IP model is based on standard protocols around …

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KEY TERMS in Computer Networks

KEY TERMS in Computer Networks Following are some important terms, which are frequently used in context of Computer Networks. Terms Definition 1. ISO The OSI model is a product of the Open Systems Interconnection project at the International Organization for Standardization. ISO is a voluntary organization. 2. OSI Model Open System Interconnection is a model …

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