        PC Repair and Troubleshooting
   Hardware   Software
   Motherboard   Power Supply   Drives   IO Devices   Communication Devices   Storage Devices
   CPU - performs most of the calculations which enable a computer to function   Heat Sink and Fan – cools the CPU   RA...
   converts alternating current (AC) electric power to low-    voltage DC power for the internal components of the    com...
   CD / DVD / HD DVD / Blu Ray   Floppy   HDD   USB Flash   Tape
   Keyboard   Mouse   Monitor   Webcam   Microphone   Speaker   Headset   Printer   Scanner
   Primary   Secondary   Tertiary    o Disks       • Magneto optic disks       • Optical disks       • WORM    o Tapes ...
   Repeater   NIC   Modem   Hub   Bridge   Switch   Router
HUB                    BRIDGE                  SWITCH                  ROUTER   Physical Layer           Data Link Layer  ...
1 hardware fundamentals
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1 hardware fundamentals

  1. 1.  PC Repair and Troubleshooting
  2. 2.  Hardware Software
  3. 3.  Motherboard Power Supply Drives IO Devices Communication Devices Storage Devices
  4. 4.  CPU - performs most of the calculations which enable a computer to function Heat Sink and Fan – cools the CPU RAM - stores resident part of the current running OS and all running processes BIOS o Boot firmware • Fixed / ussually small programs o Power Management Chipset - provides the supporting interfaces between the CPU and the various buses and external components. This chipset determines, to an extent, the features and capabilities of the motherboard. Internal Busses - connect the CPU to various internal components and to expansion cards for graphics and sound o PCI o SATA o ATA External Busses Controllers - support ports for external peripherals. o USB o IEEE 1394 interface - serial bus interface standard for high-speed communications and isochronous real-time data transfer, frequently used by personal computers, as well as in digital audio, digital video, automotive, and aeronautics applications. o Small Computer System Interconnect - set of standards for physically connecting and transferring data between computers and peripheral devices
  5. 5.  converts alternating current (AC) electric power to low- voltage DC power for the internal components of the computer
  6. 6.  CD / DVD / HD DVD / Blu Ray Floppy HDD USB Flash Tape
  7. 7.  Keyboard Mouse Monitor Webcam Microphone Speaker Headset Printer Scanner
  8. 8.  Primary Secondary Tertiary o Disks • Magneto optic disks • Optical disks • WORM o Tapes o USB Flash o External HDD
  9. 9.  Repeater NIC Modem Hub Bridge Switch Router
  10. 10. HUB BRIDGE SWITCH ROUTER Physical Layer Data Link Layer Data Link Layer Network Layer Bus Backbone MAC Address MAC Address IP AddressTransmits to all ports Transmits only if on Transmits to a Transmits to a the other side designated host designated hostDon’t analyse traffic Allow/Disallow traffic Manages traffic Avoids traffic 1 Collision & Every segment has a Every port has Separates Broadcast Broadcast Domain collision domain and Collision Domain and Domain Broadcast domain as a Broadcast Domain as whole a whole Same Subnet Same Subnet Same Subnet Different Subnets used on small used to connect large networks use most common home networks where the different network switches rather than use for routers is toamount of data going segments hubs to connect share a broadbandacross the network is computers within the internet connection. never very high same subnet Creates a network Connects Network Connects Network Connects Network segment Segments Segments
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