In English. Habilov Ikromjon Daminovich. Group- 714-18 ki it organizations Prepare

Unit 3
6. Data communication
Networks. Make presentation using the information.
Reading 2. Read this web page. Match the paragraphs (1-3) to these points.
a) types of software and devices on networks -3
b) the main types of networks -1
c) the arrangements of computers in networks -2
What is a network?
(1) A network is group of linked computers or other (2) devices. There are two kinds of networks that are (3) in common use. In Local Area Networks (LANs) (4) computers are close together-perhaps in the same (5) building. They might be connected directly to each (6) other by cable or through a wireless network such as (7) wi-fi. In contrast, wide area networks (WANs) cover (8) a larger area and usually use telephone lines or a (9) mobile phone system to connect. A LAN can be a (10) part of a WAN.
(11) There are different types of wired networks. One is a (12) star system. In this, each computer (or other device) (13) is connected to a central server. Another type is a ring (14) system. This is a network that has each computer (15) linked to two others. In a bus system there is a central (16) cable which is called a bus, and each computer is (17) linked to it. Some large networks use a mesh. In this, (18) each computer is linked to several others. This has (19) one big advantage: if one connection breaks, the data (20) can use other connections. Therefore, it is difficult to (21) break a mesh network.
(22) Many networks work on a client-server system. In (23) this, servers are special computers that store data, (24) serve websites and have other similar functions. (25) Generally, a client program will ask the server for (26) data and the server will then send the data back (27) to the client. For example, when you type a web (28) address into a browser, the browser (the client) will (29) ask the server for a web page, which then sends the (30) web page back.