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Computer communication and networks


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Computer communication and networks Computer networks communication interfaces enabling computers information transfer - transfer of information and files between computers sharing technical resources - computers, printers, disks, scanners ... use of network services - communication, file, print, security ... Distribution of networks Depending on the size LAN (local) - room, building, school ... MAN (urban) - regional non-public network - cable TV + PC network WAN (public) - national and global network - the Internet By order P2P (each with each other) - Exchange Information Networks - BitTorrent, DC K-S (client server) - server provides service sharing - WWW, FTP, Mail ... According to the link wire - coaxial cable 10 Mbps (bus), ..

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Computer communication and networks

Computer networks

  • communication interfaces enabling computers
  • information transfer - transfer of information and files between computers
  • sharing technical resources - computers, printers, disks, scanners ...
  • use of network services - communication, file, print, security ...

Distribution of networks

Depending on the size

  • LAN (local) - room, building, school ...
  • MAN (urban) - regional non-public network - cable TV + PC network
  • WAN (public) - national and global network - the Internet

By order

  • P2P (each with each other) - Exchange Information Networks - BitTorrent, DC
  • K-S (client server) - server provides service sharing - WWW, FTP, Mail ...

According to the link

  • wire - coaxial cable 10 Mbps (bus), twisted pair TP (Twisted Pair) 1 Gbps
  • optical cable - spec. plastic fibers, min. attenuation, up to 40 Gbps
  • wireless - optical links (IR, laser), radio connections (Bluetooh, WiFi, Mobile, Satellite)

Depending on the layout - topology

  • bus - cheap, obsolete, coaxial cable, T-branch, 10 Mbps
  • star - the most common LAN connection, TP cable, switch usage, 100 Mbps, 1Gbps
  • tree - corporate - school LAN, branched star, use of switches and routers

Servers

computers that provide services to users working on client PCs,  specially equipped computers with special software

Server hardware

powerful multi-core processor, high RAM capacity, backed-up fast disk array

Server software

special network OS - MS Windows Server, Novell Netware, Solaris, Linux

special server applications - MS SQL Server, MySQL, Apache, DNS server

Server services

  • File Server - Share Network Drives
  • Database server - Structured data store
  • Print Server - Share Network Printers
  • Web server - running the WWW service
  • FTP and Mail Server - FTP and Mail traffic on the Internet

Network Components

Repeater

signal amplifier

extends the segment length to the desired value

Hub (Hub)

network branching and interconnection of stations

Switch (Switch)

an intelligent connection element working with MAC address stations

Bridge (Bridge)

network segments

Router

linking local networks and routing data between networks using IP addresses

Gateway

local network connection to the public network



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