Tuesday, March 27, 2012

Week 4

Chapter: Network hardware


Today, my entry will be on network hardware. But on top of that, let's just browse through the network architecture. There are two major types of network architecture:
a) Peer-to-peer

  • workstations connected to each other but do not have servers.
  • files can be shared between workstations and also the printers. 

b) client/server network

  • consists of two kinds of computers
  • clients are the workstations, servers are powerful computers and held in central locations.
  • need client software and server software
let's skip the architecture part and went straight to the hardware. what are the equipments available in network hardware?

1. Client - servers configuration
  • server - controls the communication of information between the nodes on a network. 
  • client/ workstations - all computers connected to the file server on a network
2. Network Interface Card
  • provides the physical connection between the network and the workstation
  • necessary to determine the speed and performance of network
3. Repeaters
  • connectors that take signals that is being transferred on a network and re-transmits the information.
  • allow signal to travel farther along a network
  • do not operate efficiently when they have to transfer large amount of information.
4. Hub/Switch
  • device that provides a central connection point for cables from workstations, servers and peripherals. 
  • multislot concentrators 
  • passive hubs - do not process information, connect wires to the network
  • active hubs - amplify signals to eliminate errors on the network.
5. Bridges
  • allows computer on individual networks or separate parts of a network to exchange information.
  • can only transfer information from one network to another. 
  • split an overloaded network into smaller parts.
6. Routers
  • link different networks together. 
  • analyse the information passing through to prevent looping problems. 
  • determine the best route for information
7. Gateways
  • link two different network types together. 
  • a hardware device that connect to the network physically and transfer information between them.
8. Modems

  • allow computers on a network to exchange information.
  • translates information into a form that can be transmitted over telephone lines
  • inexpensive way of communication


UTP Cable connectors
  • unshielded twisted pair cabling is an RJ-45 connector.
  • a plastic connector that looks like a large telephone-style connector. 
Coaxial cable connector
  • familiar from TV cable and VCR. 
Fibre optic connector

  • common used in fibre optic connector is the ST connector.

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