Components Network. Types of network 7 лекция Avtor presentation is Kadyrova A.S.

Computer Network- a set of hardware and software, intended to gain access to remote resources, united means data transmission. What is a computer network? Means for trancfer data: electric cable; telephone lines; fiber optical cable; radio (wireless networks, WiFi). 2

Classification of networks 1) According to the degree of territorial dispersed local Computer networks global regional 3

Peer to Peer the local network In Peer to Peer the local network all computers are equal. General devices can be connected to any computer on the network. 2) The type of construction 4

Network with a dedicated server The structure of the network with a dedicated server 5

Server (servicing device) - computer, which allocates resources among the network users. The server has a powerful processor, large memory and disk memory stores the bulk of the software and data network, which is available to all users on the network. 6 Network with a dedicated server

Line topology 1 server Line printer a personal computer 7

Line topology 2 Server 8 printer a personal computer

The star topology Server hub (хаб) 9 printer a personal computer

Distributed stat topology Server hub Server hub Server hub 10 printer

The annular topology Server 11 a personal computer

The hardware components of computer network Network cards (network adapters). Hubs (concentrators) – device duplicate the data for all ports. Switches (switching hubs) - transmitting the data. Only the recipient. 12

Network adapters - technical devices perform functions interfacing computers with communication channel 13

Thickener(HUB or Switch) - are used to connect computers in a network. The hub can have a different number of connection ports (usually from 8 to 32). 14

Router (router) - a network device, make decisions about packet forwarding 15

Network cables: coaxial twisted pair fiber-optic insulation (Copper) wire conductor (glass) shell Shell (plastic) main fiber(glass) Rate transmission data : coaxial– 10 Mbit /sec twisted pair– 100 Mbit /sec fiber-optic – 10 Gbit /sec 16

Wireless Networks Channels of connection: radio, typically up to 100 m (11 Mbit / c, 54 Mbit / s) infrared radiation (5-10 Mbits / sec) Infrared lasers (up to 100 Mbit / s) Technology WiFi (Wireless Fidelity) access point 17

Star – connect some network segments Distant Wireless Networks Point-point – the union of two network segments using Radiocommunication (directional antennas). centre 18

InterNet inter – between" net, network – net" Internet - a global network of computer networks. Channels of connection: cable, fiber optical, satellite radio Provider - a company provides users access to the Internet through its network. 19

satellite or fiber channel connection with the Internet server modem splitter Telephone center Modem ADSL-modem router Hub ADSL-modem provider dial-up ADSL Leased line Type of connection to the Internet 20

Modem device produces modulation (convert digital signals to analog) and demodulation (converting analog signals to digital). 21

We must answer the questions: What types of compounds are known to you, for the formation of a local network? List what you know types of computer networks ? What do I need to connect a LAN ? 22