Being a Savvy Computer User                       and Consumer• Avoid hackers and viruses• Protect your privacy• Understan...
Digital Home• In a digital home, you can control home  systems from your computer and via the  Internet.                Co...
Digital Home - Components• Media computer with:  – TV tuner                                   – A network  – Radio tuner  ...
Switches Representing Data• The on/off state of a switch represents one bit  of data.• Bit (binary digit)            ON   ...
Bits and Bytes:         The Language of Computers• Bit  – Binary digit  – 0 or 1• Byte  – 8 bits• Each letter, number, and...
Representing Letters                                 and Symbols  • American Standard Code for Information    Interchange ...
How Much Is a Byte?Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall   8
Mice• Optical mouse  – Needs no mouse pad  – Doesn’t need cleaning  – Is more expensive• Trackball  – Easier on wrists  – ...
New Mouse Features• Instant viewer• Magnifier• Customizable  buttons• Web search                   Copyright © 2010 Pearso...
Monitor Types• CRT (Cathode-Ray                             • LCD (Liquid Crystal  Tube)                                  ...
The Front Panel• Power control• Drive bays• Memory card  reader• Productivity portsCopyright © 2010 Pearson Education, Inc...
Power Controls• Power-on button: Turns on system,  should not be used to turn it off• Other options:        – Sleep mode  ...
Inputting Sound• Microphones are  used for:  – Podcasts  – Video-    conferencing  – Internet phone    calls  – Speech    ...
Other Input Devices• EPOS Digital Pen• Webcam  – Live video                 Copyright © 2010 Pearson Education, Inc.      ...
Input Devices for the            Physically Challenged• Visual impairments  – Voice recognition  – Keyboards with large ke...
Storage Media Capabilities                                                                       17Copyright © 2010 Pearso...
On the Back• Ports for peripherals• Types of ports:  – Serial and parallel  – Audio and video  – USB  – FireWire  – Connec...
Inside the System Unit• Essential electronic  components used to  process data• Types of  components:        –    Power su...
The Motherboard• CPU• RAM• Expansion  cards and  slots• Built-in  components               Copyright © 2010 Pearson Educat...
Memory Module•   Random access memory (RAM)•   Stores instructions and data•   Temporary (volatile) storage•   Operates in...
Setting It All Up: Ergonomics• Ergonomics: minimizing injury or  discomfort while using the computer• Steps to follow:  – ...
Ergonomics and Mobile Devices Mobile devices present ergonomic challenges Ergonomic “Disease”                             ...
Internet Communications     •     Instant messaging     •     Podcasts     •     Blogs and vlogs     •     Webcasts     • ...
Social Networks• Social networks: online personal networks  – MySpace.com and Facebook.com• Members share common interests...
Group Communication•     Internet social networks•     Multiplayer online game services•     Chat rooms•     Newsgroups•  ...
URLs• URL:  – Uniform Resource Locator  – Unique Web site addressURL                Copyright © 2010 Pearson Education, In...
Application Software    Copyright © 2010 Pearson Education, Inc.                                               28         ...
Buying Software• Software may be purchased        – Through retail stores        – Online        – At computer shows      ...
Freeware and Shareware• Freeware: Copyrighted software you can get free• Beta versions: Programs still under development• ...
Wired Ethernet Networks• Ethernet network  adapters are used to  connect nodes   – NIC card   – PC card   – USB adapter• C...
How Computers Are Attacked• Trojan horse• Backdoor program       – Zombies• Denial of service  attacks (DoS)• Distributed ...
The CPU Machine Cycle• Fetch    – The program’s binary code is “fetched” from its temporary      location in RAM and moved...
Making Computers Faster • Pipelining: The CPU processes more than one   instruction at a time                             ...
Cache Memory• Small amount of memory  located on or near the  CPU chip• Stores recent or  frequently used  instructions an...
Client/Server Networks• Server-based network       – Clients and servers• Data flows efficiently• Servers respond to  requ...
Classifications of                           Client/Server Networks• LAN       – Local area         network       – Comput...
Classifications of                           Client/Server Networks• WAN       – Wide area         network       – Compute...
Classifications of                           Client/Server Networks• PAN       – Personal area network       – Wireless de...
Classifications of                           Client/Server Networks• Extranets       – Only certain corporations or indivi...
Avoiding Data Collisions                          on an Ethernet NetworkCopyright © 2010 PearsonEducation, Inc. Publishing...
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ITBIS105 1

  1. 1. Being a Savvy Computer User and Consumer• Avoid hackers and viruses• Protect your privacy• Understand the real privacy and security risks• Use the Internet wisely• Avoid online annoyances• Maintain your computer• Make good purchase decisions• Integrate the latest technology Copyright © 2010 Pearson Education, Inc. 1 Publishing as Prentice Hall
  2. 2. Digital Home• In a digital home, you can control home systems from your computer and via the Internet. Copyright © 2010 Pearson Education, Inc. 2 Publishing as Prentice Hall
  3. 3. Digital Home - Components• Media computer with: – TV tuner – A network – Radio tuner – A digital television – Media software – A digital media – Blu-ray, DVD, and/or CD adapter – Network adapter – A universal remote Copyright © 2010 Pearson Education, Inc. 3 Publishing as Prentice Hall
  4. 4. Switches Representing Data• The on/off state of a switch represents one bit of data.• Bit (binary digit) ON OFF – On = 1 0 1 – Off = 0 OR = 1 bit 1 0Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall
  5. 5. Bits and Bytes: The Language of Computers• Bit – Binary digit – 0 or 1• Byte – 8 bits• Each letter, number, and character = a string of eight 0s and 1s Copyright © 2010 Pearson Education, Inc. 5 Publishing as Prentice Hall
  6. 6. Representing Letters and Symbols • American Standard Code for Information Interchange (ASCII) – 8 bits = 1 byte = alphanumeric character or symbol – 256 different combinations • Unicode – 16 bits equal 1 byte – 96,000 different combinations; used for all languagesCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall
  7. 7. How Much Is a Byte?Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 8
  8. 8. Mice• Optical mouse – Needs no mouse pad – Doesn’t need cleaning – Is more expensive• Trackball – Easier on wrists – Stays stationary on desk• Wireless – Uses radio or light waves Copyright © 2010 Pearson Education, Inc. 9 Publishing as Prentice Hall
  9. 9. New Mouse Features• Instant viewer• Magnifier• Customizable buttons• Web search Copyright © 2010 Pearson Education, Inc. 10 Publishing as Prentice Hall
  10. 10. Monitor Types• CRT (Cathode-Ray • LCD (Liquid Crystal Tube) Display) – Less expensive – More expensive – Uses much more space – Uses far less space – Uses more energy – More energy efficient – Offers better viewing angles – Less viewable from an angle – Legacy technology Copyright © 2010 Pearson Education, Inc. 11 Publishing as Prentice Hall
  11. 11. The Front Panel• Power control• Drive bays• Memory card reader• Productivity portsCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 12
  12. 12. Power Controls• Power-on button: Turns on system, should not be used to turn it off• Other options: – Sleep mode – Hibernation – Warm bootCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 13
  13. 13. Inputting Sound• Microphones are used for: – Podcasts – Video- conferencing – Internet phone calls – Speech recognition Copyright © 2010 Pearson Education, Inc. 14 Publishing as Prentice Hall
  14. 14. Other Input Devices• EPOS Digital Pen• Webcam – Live video Copyright © 2010 Pearson Education, Inc. 15 Publishing as Prentice Hall
  15. 15. Input Devices for the Physically Challenged• Visual impairments – Voice recognition – Keyboards with large keys – On-screen keyboards• Motor control issues – Special trackballs – Head-mounted devices Copyright © 2010 Pearson Education, Inc. 16 Publishing as Prentice Hall
  16. 16. Storage Media Capabilities 17Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall
  17. 17. On the Back• Ports for peripherals• Types of ports: – Serial and parallel – Audio and video – USB – FireWire – Connectivity • Ethernet • Modem Copyright © 2010 Pearson Education, Inc. 18 Publishing as Prentice Hall
  18. 18. Inside the System Unit• Essential electronic components used to process data• Types of components: – Power supply – Hard disk drive – Motherboard – CPU – Expansion cardsCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 19
  19. 19. The Motherboard• CPU• RAM• Expansion cards and slots• Built-in components Copyright © 2010 Pearson Education, Inc. 20 Publishing as Prentice Hall
  20. 20. Memory Module• Random access memory (RAM)• Stores instructions and data• Temporary (volatile) storage• Operates in nanoseconds Copyright © 2010 Pearson Education, Inc. 21 Publishing as Prentice Hall
  21. 21. Setting It All Up: Ergonomics• Ergonomics: minimizing injury or discomfort while using the computer• Steps to follow: – Position monitor correctly. – Use adjustable chair. – Assume proper position while typing. – Take breaks. – Ensure adequate lighting. Copyright © 2010 Pearson Education, Inc. 22 Publishing as Prentice Hall
  22. 22. Ergonomics and Mobile Devices Mobile devices present ergonomic challenges Ergonomic “Disease” CauseBlackberry thumb Thumb typing without breaks or stretching can cause DeQuervains’ tendinitis in the thumbs.iPod deafness Listening through ear buds for prolonged periods at a volume of 80 decibels or more can cause deafness.Cellular blindness Extended viewing on tiny screens can cause eye strain and/or dry eyes.Laptop thighs Resting a laptop directly on your lap for extended periods of time can result in 1st and 2nd degree burns.Laptop shoulder Large, heavy, one-strap laptop bags can result in neck, shoulder, and back pain and/or strain. Copyright © 2010 Pearson Education, Inc. 23 Publishing as Prentice Hall
  23. 23. Internet Communications • Instant messaging • Podcasts • Blogs and vlogs • Webcasts • Wikis • Voice over Internet (VoIP) • E-mailCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 24
  24. 24. Social Networks• Social networks: online personal networks – MySpace.com and Facebook.com• Members share common interests.• Members communicate by voice, chat, IM, video, and blogs.• Members create personalized profiles.• Growth has been explosive.• Risks must be recognized and reduced. Copyright © 2010 Pearson Education, Inc. 25 Publishing as Prentice Hall
  25. 25. Group Communication• Internet social networks• Multiplayer online game services• Chat rooms• Newsgroups• ListservsCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 26
  26. 26. URLs• URL: – Uniform Resource Locator – Unique Web site addressURL Copyright © 2010 Pearson Education, Inc. 27 Publishing as Prentice Hall
  27. 27. Application Software Copyright © 2010 Pearson Education, Inc. 28 Publishing as Prentice Hall
  28. 28. Buying Software• Software may be purchased – Through retail stores – Online – At computer shows – Through catalogs• Preinstalled software• Web-based application software – Hosted on a Web site – Requires no installation on your computer• Discounted softwareCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 29
  29. 29. Freeware and Shareware• Freeware: Copyrighted software you can get free• Beta versions: Programs still under development• Shareware: Software that allows users to run it for a limited time free of charge• Open source: free to useCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 30
  30. 30. Wired Ethernet Networks• Ethernet network adapters are used to connect nodes – NIC card – PC card – USB adapter• Computers are Ethernet connected to each other using unshielded twisted Phone pair cable Copyright © 2010 Pearson Education, Inc. 31 Publishing as Prentice Hall
  31. 31. How Computers Are Attacked• Trojan horse• Backdoor program – Zombies• Denial of service attacks (DoS)• Distributed denial of service attacks (DDoS)Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall 32
  32. 32. The CPU Machine Cycle• Fetch – The program’s binary code is “fetched” from its temporary location in RAM and moved to the CPU.• Decode – The program’s binary code is decoded into commands that the CPU understands.• Execute “Inside the Chip” by – The ALU performs the calculations. Intel• Store Video Clip – The results are stored in the registers.Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall
  33. 33. Making Computers Faster • Pipelining: The CPU processes more than one instruction at a time Nonpipelined CPU Instruction 1 Fetch Decode Execute Store Instruction 2 Fetch Decode Execute Store Pipelined CPUInstruction 1 Fetch Decode Execute Store Instruction 2 Fetch Decode Execute Store Instruction 3 Fetch Decode Execute Store Instruction 4 Fetch Decode Execute Store Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall
  34. 34. Cache Memory• Small amount of memory located on or near the CPU chip• Stores recent or frequently used instructions and data• Used for quick access by the CPU• Different levels of cacheCopyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall
  35. 35. Client/Server Networks• Server-based network – Clients and servers• Data flows efficiently• Servers respond to requests from clients• Servers perform specific tasks• Scalable• CentralizedCopyright © 2010 PearsonEducation, Inc. Publishing as 36Prentice Hall
  36. 36. Classifications of Client/Server Networks• LAN – Local area network – Computers linked over a small geographic regionCopyright © 2010 PearsonEducation, Inc. Publishing as 37Prentice Hall
  37. 37. Classifications of Client/Server Networks• WAN – Wide area network – Computers linked over large geographic locations• MAN – Metropolitan area network – Computers linked within a city or countyCopyright © 2010 PearsonEducation, Inc. Publishing as 38Prentice Hall
  38. 38. Classifications of Client/Server Networks• PAN – Personal area network – Wireless devices connected in close proximity to each other• Intranet – Private corporate network – Protected by a firewallCopyright © 2010 PearsonEducation, Inc. Publishing as 39Prentice Hall
  39. 39. Classifications of Client/Server Networks• Extranets – Only certain corporations or individuals can access – Useful for enabling electronic data interchange – Use virtual private networks for securityCopyright © 2010 PearsonEducation, Inc. Publishing as 40Prentice Hall
  40. 40. Avoiding Data Collisions on an Ethernet NetworkCopyright © 2010 PearsonEducation, Inc. Publishing as 41Prentice Hall
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