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Introduction to Computer Network

Introduction to Computer Network

Computer Network: – A network is a set of devices (often referred to as nodes) connected by media links. A node can be a computer, printer or any other devices capable of sending or receiving data generated by other nodes. On the network the link connecting the devices often called communication channels. Network use distributed processing in which a task is ... Read More »

Digital and Analog Data

digital data

Digital and Analog Data: –   1.      Digital Data: – Suppose we are standing on the hockey playground, The whistle is below in short bursts of high pitched sounds like, PEE, PE, PE, PE or it may have a long burst PEEEEEEE. Both of these whistles call Conway different meaning to the players. The first one is an indication to the players to ... Read More »

Data Transmission Modes

full duplex configuration

Data Transmission Modes: – There are three modes of data transmission that corresponds to the three types of circuits available. Simplex, Half – Duplex and Full – Duplex.   1.      Simplex: – Simplex communications imply a simple method of communicating, which they are. In simplex communications mode, there is a one way communication transmission. Television transmission is good example of simplex communications. ... Read More »

Topologies

lenear bus topology

Topologies: – Topology is the way networks are physically connected together. Topology determines the complexity and therefore the cost of network cable installation. Cable installation can often be a major cost factor for network system. Topology also determines the strategy for physically expanding the network.   Linear Bus Topology: – In this layout, a single main cable connects each node, in what ... Read More »

Networks

multipoint

Networks: – A network is a set of devices often referred to as nodes connected by media links. A node can be as computer, printer or any other device capable of sending and receiving data guaranteed by other nodes on the network. The links connecting the devices are often called communication channels.   Distributed Processing: – Network uses distributed processing in which ... Read More »

OSI Model

osi model

OSI Model: – An ISO standard that covers all aspect of network communications in the Open System Interconnection (OSI Model). An open system is a model that allows only two different systems to communicate regardless of their underlying architecture. Open system interconnection model is not a protocol it is a model for understanding & designing a network architecture that is flexible ... Read More »

TCP/IP Protocol Suite

TCP/IP Protocol Suite

TCP/IP Protocol Suite: – The TCP/IP protocol suit, used in the internet, was developed prior to the open system interconnection model; therefore the layers in the transmission control protocol suit do not match exactly with those in the open system interconnection model. The TCP/IP protocol suit is made of five layers: Physical, Data Link, Network, Transport and Application. The first four ... Read More »

Network Connectivity

client server network

Network Connectivity: – To expand a network without breaking it into new parts for connecting it to other networks are have to use devices like, Hub Repeaters Bridges Routers Multiplexers Gateways Switches   Hub: – All networks require a central location to bring media segments together. These central locations are called hub. They are also called multipart repeaters or connectors. We should ... Read More »

Network operating system (NOS)

Network operating system (NOS)

Installing Cable – Some Guidelines When running cable, it is best to follow a few simple rules: Always use more cable than you need. Leave plenty of slack. Test every part of a network as you install it. Even if it is brand new, it may have problems that will be difficult to isolate later. Stay at least 3 feet ... Read More »

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