PALIES IT SERVICE-THE HISTORY OF COMPUTER NETWORK SYSTEM

PALIES IT SERVICE-THE HISTORY OF COMPUTER NETWORKS

Network pc devices that originate, route and terminate the information square measure referred to as network nodes. Nodes will embrace hosts like personal computers, phones, servers yet as networking hardware. 2 such devices is aforesaid to be networked along once one device is ready to exchange data with the opposite device, whether or not or not they need a right away association to every different.
Computer networks take issue within the transmission medium accustomed carry their signals, communications protocols to prepare network traffic, the network's size, topology and structure intent.

NETWORKS

Computer networks support a colossal variety of applications and services like access to the planet Wide internet, digital video, digital audio, shared use of application and storage servers, printers, and fax machines, and use of email and instant electroniccommunication applications yet as several others. In most cases, application-specific communications protocols square measure superimposed (i.e. carried as payload) over different additional general communications protocols.

Properties:

Computer networking could also be thought of a branch of EE, telecommunications, computer science, information technology or computer engineering, since it relies upon the theoretical and practical application of the related disciplines.

A computer network facilitates interpersonal communications allowing users to communicate efficiently and easily via various means: email, instant messaging, chat rooms, telephone, video telephone calls, and video conferencing. Providing access to information on shared storage devices is an important feature of many networks. A network allows sharing of files, data, and other types of information giving authorized users the ability to access information stored on other computers on the network. A network allows sharing of network and computing resources. Users may access and use resources provided by devices on the network, such as printing a document on a shared network printer. Distributed computing uses computing resources across a network to accomplish tasks. A computer network may be used by computer crackers to deploy computer viruses or computer worms on devices connected to the network, or to prevent these devices from accessing the network via a denial of service attack.

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Network packet:

Computer communication links that do not support packets, such as traditional point-to-point telecommunication links, simply transmit data as a bit stream. However, most information in computer networks is carried in packets. A network packet is a formatted unit of data (a list of bits or bytes, usually a few tens of bytes to a few kilobytes long) carried by a packet-switched network.
In packet networks, the data is formatted into packets that are sent through the network to their destination. Once the packets arrive they are reassembled into their original message. With packets, the bandwidth of the transmission medium can be better shared among users than if the network were circuit switched. When one user is not sending packets, the link can be filled with packets from other users, and so the cost can be shared, with relatively little interference, provided the link isn't overused.

Packets consist of two kinds of data: control information, and user information (payload). The management data provides information the network has to deliver the user information, for example: supply and destination network addresses, error detection codes, and sequencing data. Typically, management data is found in packet headers and trailers, with payload information in between.
Often the route a packet has to take through a network isn't directly out there. in this case the packet is queued and waits till a link is free.

Network topology:

The physical layout of a network is sometimes more modest than the topology that connects network nodes. Most diagrams that describe a physical network square measure thus topological, instead of geographic. The symbols on these diagrams typically denote network links and network nodes.

Network links:

The transmission media (often said within the literature because the physical media) accustomed link devices to make a network embrace transmission line (Ethernet, HomePNA, power cable communication, G.hn), glass fibre (fiber-optic communication), and radio waves (wireless networking). within the OSI model, these square measure outlined at layers one and a pair of — the physical layer and therefore the electrical circuit layer.

A wide adopted family of transmission media utilized in native space network (LAN) technology is put together referred to as local area network. The media and protocol standards that modify communication between networked devices over {ethernet|local square measurea network|LAN} are outlined by IEEE 802.3. local area network transmits information over each copper and fiber cables. Wireless LAN standards (e.g. those outlined by IEEE 802.11) use radio waves, or others use infrared signals as a transmission medium. power cable communication uses a building's power cabling to transmit information.

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