LAN



   LAN

   
   The local computer network, LAN (English Local Area Network, LAN) the computer network covering rather small territory, such as the house, office, firm or small group of buildings, for example, institute.
   Computers can incorporate under various reports, such as wi-fi or Ethernet. A LAN can have sluices with other local networks; to be a part or to have connection to the global computer network, for example to the Internet.
   The important property of local networks on report TCP/IP is presence of the identifier at each computer-IP-address. They can be appointed(nominated) independently each computer-client, or to be appointed(nominated) DHCP a-server, zapushchenom on a server. DHCP a server if it(he) unique, excludes an opportunity sereznoj the mistake(error) caused by concurrence IP of addresses several clients. The local network or LAN is a group of personal computers or the peripheral devices incorporated among themselves by the high-speed data link in an arrangement of one or many nearby buildings. Also there is a concept the local computer network.
   The basic purpose of any kinds of computer networks is the organization of the incorporated access to resources of any of computers which is connected to the given network. First, it is joint access to the various information and programs. It when data or programs which nakhodyatsyaya on one of computers of a network can will be applied on any of the computers connected to them. So occurs(happens), for example, at use of the program network accounting when the workers having access to this network, can make changes to a uniform database. For realization of a continuous communication between computers of a local network they are connected in, by so-called working groups.
   Working group - group of persons(faces), for example, employees of the organization who are engaged in one project or the task. Modern local networks are directed. The group can be named group of the computers borrowed(occupied) by processing of one network game, for example. Computers of each working group make a separate cell.
   It is possible to carry a server of a press(seal) to separate group with the several usual printers connected to them getting network opportunities and can work on a network irrespective of support in them of this operating mode. As a rule, servers of a press(seal) have sockets LPT. Such servers are applied in very large organizations, in house conditions it is quite enough to have one printer on a computer connected to a local network that to it(him,them) had access all computers belonging to the given working group.
   All aforesaid it is possible to unite one term - joint access to resources.
   Except for already considered(examined) advantages, there is one more and rather important. Owing to presence of a continuous communication between computers there is an ability of the removed administration when behind one computer it is possible to watch(keep up) work of other computers which podklyuchenny to a local network is for example, whether the concrete computer is included, or what programs on it(him) at present are started also the other helpful information.
   Because of it(this) there was a term the system administrator " it chelo a century which is responsible for work of a local network as a whole and the person operating a system policy(politics) operates modes of joint access to resources of a network, other language.
   The most important plus of a local network is an opportunity to save. Purchase of one printer , the scanner , the modem and other devices is equal at cost to purchase of the network equipment . For example , it is possible to get one big hard disk and to keep on it(him) films , music, programs and other volumetric files.



















                 
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