Text of Networking Relationships What is a computer network?
Networking RelationshipsWhat is a computer network?
What is a Computer Network?a network is: group of two or more nodesconnected together by transmission mediafor the purpose of sharing resources
Network ElementsNodea node is any hardware device that is directly connected to a networkExamples include:Assorted types of computer systemsPrinters and plottersScannersCommunication hardware (modems, etc.)Hard Disk Drives
Network ElementsTransmission Mediathe transmission media consists of the physical connections, that facilitate the transmission of signals, between nodes on a networkTelephone linesTwisted Pair cableCoaxial CableFiber-optic CableMicrowave TransmissionSatellite Transmission
Network ElementsResourcea resource is a hardware, software, or data sourceExamples include:Storage space on Secondary StorageAbility to send a email from an iPhoneProcessing power of high performance CPUOutputting to high quality printerApplication executed from HD of remote systemTransfer of data files from node to nodeWeb Pages requested and received
Types of NodesA typical network includes several nodes; some nodes act as server, some as client, and some as both server and clientServera server is a node that makes its resources available to and for use by other network nodes; therefore, a server shares its resources across the networkClienta client is a node that requests and uses resources on a network which are made available and shared by a server on the network
How are Resources Shared?Resources are shared across networks through network servicesServicea service is a communication scheme or standard supplying some public demand for shared resources on a network; scheme consists of user interaction characteristics and the protocol for transmitting signal.
Network ServicesLets look at a specific network, the InternetInternetthe Internet is a global public network facilitating all sorts of services; the Internet is the largest world-wide networkLike in smaller networks, resources are shared over the Internet using services
Network ServicesSome of the services facilitated by the Internet are:E-mailthe email service is a network service that facilitates exchange of messagesWorld Wide Webthe world wide web service (WWW) is a network service facilitating the transfer and display of hypertext document filesFile Transfer Protocolthe file transfer protocol service (FTP) is a network service that allows for relatively fast transfer of whole files