Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer...
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Transcript of Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer...
![Page 1: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/1.jpg)
Computer communication
Networks
![Page 2: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/2.jpg)
Topologies
Bus Network
Terminator ‘Workstation’‘Client’
‘Terminal’‘Node’
Computer
TerminatorBackbone
Server(optional)
![Page 3: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/3.jpg)
Topologies
Bus Network
Terminator ‘Workstation’‘Client’
‘Terminal’‘Node’
Computer
TerminatorBackbone
Server(optional)
Network interface card (NIC)T connector – plugs into NIC
![Page 4: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/4.jpg)
Topologies
Bus Network• All components are connected via a backbone.
• At each end of the backbone is a terminator which stops signals ‘bouncing back’ down the network.
• Each network interface card is passive: they all listen to the backbone for signals addressed for them.
• Signals are sent in both directions of the backbone at the same time.
• Only one computer can transmit successfully at any one time, however this is not regulated so collisions and data corruption do occur.
• A protocol called CSMA-CD (carrier sense multiple access collision detection) is used to handle this problem.
![Page 5: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/5.jpg)
Topologies
Bus Network• Bus networks work well under small loads: small
number of computers, small demand for resources. Under heavy loads it can be very slow or completely grind to a halt.
• If a machine goes down it doesn’t affect the network.
• A break in the backbone will result in the whole network going down.
• Bus topologies were popular in the early 1990’s. Today, better technologies (switched Ethernet) have superseded simple bus topologies.
![Page 6: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/6.jpg)
Topologies
Bus Network• Collisions on a Bus network
– Problems arises when two computers transmit onto the bus a the same time. The voltage pulses form each computer will eventually collide, resulting in higher voltage swings. A protocol is used to decrease the chance of this. This is CSMA/CD – Carrier Sense Multiple Access with Collision Detection.
![Page 7: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/7.jpg)
Topologies
Bus Network• Collisions on a Bus network
![Page 8: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/8.jpg)
Topologies
Ring Network
• Each computer is responsible for passing the message on.
• Can use token passing • Special packet is passed
around altered by a computer if it needs to send data
![Page 9: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/9.jpg)
Topologies
Star Network
• Common network• Connected by switches and
hubs.• Better performance than
bus networks
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Topologies
Classifications of Networks• Can you come up with definitions of the
following– LAN– WAN– MAN– PAN– VPN
![Page 11: Networks. Bus Network Terminator‘Workstation’ ‘Client’ ‘Terminal’ ‘Node’ Computer Terminator Backbone Server (optional)](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649dcd5503460f94ac15ba/html5/thumbnails/11.jpg)
Topologies
Classifications of Networks• Can you come up with definitions of the
following– LAN – Local Area Network– WAN – Wide Area Network– MAN – Metropolitan Area Network– PAN – Personal Area Network.– VPN – Virtual Private Network.
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Topologies
Task
Answer questions on page 129.