فؤاد أسامه النجار 220090021 فؤاد الحداد حسن مطر. A computer network...
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Transcript of فؤاد أسامه النجار 220090021 فؤاد الحداد حسن مطر. A computer network...
النجار أسامه 220090021فؤادالحداد فؤاد
مطر حسن
A computer network allows computers to communicate with many other computers and to share resources and information. The Advanced Research Projects Agency (ARPA) funded the design of the "Advanced Research Projects Agency Network" (ARPANET) for the United States Department of Defense. It was the first operational computer network in the world.
•Set of technologies that connects computers.
•Allows communication and collaboration between users.
• Simultaneous access to data
• Shared peripheral device
• Easier data backup
Personal communicationEmail
•Instantaneous communicationConferencing
•Tele conferencing•Videoconferencing•Audio-conferencing•Data-conferencing
Voice over IP•Phone communication over network wires
Local Area Network (LAN)…•Contains printers, servers and computers•Systems are close to each other•Contained in one office or building•Organizations often have several LANS
Wide Area Networks (WAN)Two or more LANs connectedOver a large geographic areaTypically use public or leased lines
Phone linesSatellite
The Internet is a WAN
Campus Area Networks (CAN)……A LAN in one large geographic areaResources related to the same organizationEach department shares the LAN
Metropolitan Area Network (MAN)Large network that connects different organizationsShares regional resourcesA network provider sells time
Home Area Network (HAN)Small scale networkConnects computers and entertainment appliancesFound mainly in the home
Personal Area Network (PAN)Very small scale networkRange is less than 2 metersCell phones, PDAs, MP3 players
SAN - Storage Area Network, System Area Network, Server Area Network, or sometimes Small Area Network .Storage Area Network - connects servers to data storage devices through a technology
like Fibre Channel .System Area Network - links high-performance computers with high-speed connections in a cluster configuration. Also
known as Cluster Area Network .
Bus topologyoAlso called linear busoOne wire connects all nodesoTerminator ends the wiresoAdvantages
Easy to setupSmall amount of wire
oDisadvantagesSlowEasy to crash
Star topologyAll nodes connect to a hub
Packets sent to hubHub sends packet to destination
AdvantagesEasy to setupOne cable can not crash network
DisadvantagesOne hub crashing downs entire networkUses lots of cable
Most common topology
Ring topologyNodes connected in a circleTokens used to transmit data
Nodes must wait for token to sendAdvantages
Time to send data is knownNo data collisions
DisadvantagesSlowLots of cable
Mesh topologyAll computers connected togetherInternet is a mesh networkAdvantage
Data will always be deliveredDisadvantages
Lots of cableHard to setup
ThE EnD