Computer network system

Computer network system1.understanding computer networkComputer network is a collection of two or lbih devices and computers connected together allowing the sharing of resources and data communications directly.shared use of resources known by the term-sharing, while power can be used with hard drives, printers, scanners, and CD ROM drives.A computer in the network can mengaksesfile another computer or copying it (copy) without requiring an external storage media such as floppy disks, CDs, and flas disk. A computer in the network can also use a printer attached to another computer. Network computers can save resources, costs, time, and effort. Saving resources for the computer network can be installed (for example) only one to five computer printers, compare if you have to install a printer for each computer. Cost effective because they do not have to buy the peripherals (eg printers) a number of existing computers. Save time and energy because they do not have to (eg) walk towards a specific computer to copy data using a diskette. You can copy data directly to a computer hard drive that is used.2.jenis-type computer networkThere are various types of networks based on some specific criteria. Networks can be classified based on the method of data distribution, functional relationships, the reach of its territory, the connection method, and based on the typology.a.Penggolongan network based on the method of data distributiondatanyajaringan based on the distribution network is divided into a centralized computer (host-based network) and a distributed network (distributed network).Centralized network consists of several computer terminals connected to kmputer parent (host). The host computer contains data and applications and perform almost all data processing. Terminals in the network center can be either a dumb terminal (dumb terminal), the terminal that has no data-processing tools. Example of a dumb terminal is a monitor that is connected to the computer physic parent.Distributed network composed of multiple computers connected to the various parent terminal.Jaringan physically distributed can be formed from a centralized network connection.b. classification of computer networks based on functional relationships in data processing.Based on how to access and data processing, computer networks can be divided into a network of client-serves and peer to peer network.Client-server network consists of a server or connected to multiple client computer. Server role in providing services, such as file access, peripherals, and databases.Peer to peer network consisting of several inter-terminal network terhubung.Prinsip this is that every computer in the network can function as a service penyedi(Servers) as well as client.c.penggolongan network based coverage wiyayahnyaBased on the coverage area, the network can be divided into LAN, MAN, WAN, CAN, and intranets.LAN (Local Area Network) or a local network is a network whose scope is relatively narrow, confined to a room or a building or a complex. Sometimes also called Singel lacation LAN network or networks located single. For administrative reasons, a large LAN normally divide and classify members of the network in the form of group work (work group). Work group is a collection of computers that share the same power in a LAN.MAN (Metropolitan Area Network) is the tissue that connects two or more LANs, but its reach does not exceed the area of ​​the metropolitan city or nearby.WAN (Wide Area Network) is a data communications network that covers a wide geographical area and usually take advantage of the communication network, eg its Internet telepon.Jaringan channel, given the wide range can be classified as a WAN. ATM network of national banks across Indonesia is also an example of a WAN network.INTERNET, As you read earlier, is an information network of a company or organization. Internet usage is limited to members / employees of companies and organizationsCAN (Campus Area Network) is a computer network that connects two or more LAN preformance of certain areas. These networks used on campus to connect the various buildings on the campus complex.d. classification method based on network connectionsBased on the connection method, the network can be divided into a wired network (wire / wireline networks) and wireless network / wireless (wireless network).Wired network, according to call it a network using a cable to connect network members. There are several kinds of cables commonly used in the network, ie coaxial cable (coaxial), twisted pair cable including UTP (Unshielded Twised Pair) and STP cable (Shielded Twisted Pair), and fiber optic (FOR, fiber optic). The wireless network is a network that uses radio waves to connect between network members.e. classification based on the network topologyshows the physical topology of computer networks. There are several network topologies, dianntaranya is a bus topology, star (star), mesh (net), and ring (rings).