CWNA Guide to Wireless LANs, Second Edition Chapter One It’s a Wireless World
Wireless Networks <ul><li>First Meeting Agenda  </li></ul><ul><li>Syllabus and Intro. </li></ul><ul><li>How to access clas...
Objectives <ul><li>Describe how wireless technology is used in daily activities </li></ul><ul><li>Tell how wireless local ...
Real Life Wireless <ul><li>What did Texas Department of Transportation do? </li></ul>
A Day in the Life of a Wireless User: Home <ul><li>Wireless data communication  has been the driving force in the 21 st  c...
A Day in the Life of a Wireless User:  Car <ul><li>Bluetooth wireless standard:  Enables short range wireless communicatio...
A Day in the Life of a Wireless User: Office <ul><li>Fixed broadband wireless:  Wireless transmissions between immobile de...
A Day in the Life of a Wireless User: Field <ul><li>Handheld devices used to connect to nearest cell tower </li></ul><ul><...
A Day in the Life of a Wireless User: On Site <ul><li>Radio frequency identification (RFID) tags:   </li></ul><ul><ul><li>...
A Look at Wireless Technologies <ul><li>Wireless technology woven throughout many aspects of life </li></ul><ul><li>Useful...
Wireless Local Area Networks (WLANs) <ul><li>Wi-Fi (Wireless Fidelity):  Based on standard that transmits at up to 11  Mbp...
Wireless Local Area Networks (continued) Wireless LAN
Wireless Local Area Networks (continued) Home wireless LAN
Bluetooth <ul><li>Low-power wireless data and voice transmission technology </li></ul><ul><li>Bluetooth devices communicat...
Telecommunications Links <ul><li>Integrated Services Digital Networks (ISDN):  Transmits at 256  Kbps </li></ul><ul><li>T-...
Telecommunications Links (continued) <ul><li>FSO:  Transmit at speeds up to 1.25  Gbps  over up to 4 miles </li></ul><ul><...
Telecommunications Links (continued) Wireless office technologies
Cellular Telephony <ul><li>Global Systems for Mobile (GSM) communications technology:  Coverage includes most of US and pa...
Cellular Telephony (continued) <ul><li>WAP cell phone runs a  microbrowser  that uses  Wireless Markup Language (WML)  ins...
Radio Frequency Identification (RFID) <ul><li>Like an electronic barcode: </li></ul><ul><ul><li>Can contain larger amounts...
Wireless Technology Categories Typical wireless technologies
Wireless LAN Applications: Education <ul><li>Educational institutions some of first adopters of WLANs  </li></ul><ul><ul><...
Wireless LAN Applications: Education (continued) Campus access point locations
Wireless LAN Applications: Business <ul><li>Wireless LAN technologies have significantly changed how business conducted </...
Wireless LAN Applications: Travel <ul><li>Travel industry perhaps adopted wireless technologies more than any other indust...
Wireless LAN Applications: Construction <ul><li>Wireless technology has greatly benefited construction industry </li></ul>...
Wireless LAN Applications: Warehouse Management <ul><li>New products arrive continuously  </li></ul><ul><ul><li>Must be in...
Wireless LAN Applications: Public Safety <ul><li>Public safety departments using WLANs and GSM to communicate information ...
Wireless LAN Applications: Healthcare <ul><li>Wireless LAN point-of-care computer systems allow medical staff to access an...
Wireless LAN Applications: Healthcare (continued) <ul><li>Documentation process takes place at bedside where care delivere...
Wireless LAN Applications: Healthcare (continued) Video pill
Wireless Advantages and Disadvantages: Advantages <ul><li>Mobility:  Primary advantage of wireless technology </li></ul><u...
Wireless Advantages and Disadvantages: Advantages (continued) <ul><li>Easier and Less Expensive Installation:  Installing ...
Wireless Advantages and Disadvantages: Advantages (continued) <ul><li>Disaster Recovery:  Documented disaster recovery pla...
Wireless Advantages and Disadvantages: Disadvantages <ul><li>Security:  Wireless signals broadcast in open air </li></ul><...
Wireless Advantages and Disadvantages: Disadvantages (continued) <ul><li>Radio Signal Interference:  Signals from other de...
Summary <ul><li>Wireless devices and technologies enable users to roam almost anywhere and remain connected to data and vo...
Summary (continued) <ul><li>Two popular technologies are WiMax and free space optics (FSO) </li></ul><ul><li>Handheld devi...
Summary (continued) <ul><li>Wireless LAN applications can be found in industries in which employees need the freedom to co...
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Linux Guide to Linux Certification

  1. 1. CWNA Guide to Wireless LANs, Second Edition Chapter One It’s a Wireless World
  2. 2. Wireless Networks <ul><li>First Meeting Agenda </li></ul><ul><li>Syllabus and Intro. </li></ul><ul><li>How to access class resources in your computer </li></ul><ul><li>Let’s get acquainted (forming groups) </li></ul><ul><ul><li>Name </li></ul></ul><ul><ul><li>Industry certification </li></ul></ul><ul><ul><li>Networking or IT courses </li></ul></ul><ul><ul><li>Interests </li></ul></ul><ul><ul><li>Why you are taking the class </li></ul></ul><ul><ul><li>Expectations of yourself </li></ul></ul><ul><ul><li>Expectations of the instructor and the class </li></ul></ul><ul><li>WebCT Login </li></ul>
  3. 3. Objectives <ul><li>Describe how wireless technology is used in daily activities </li></ul><ul><li>Tell how wireless local area networks are used in applications such as education, business, travel, construction, and other areas </li></ul><ul><li>Explain the advantages and disadvantages of wireless technology </li></ul>
  4. 4. Real Life Wireless <ul><li>What did Texas Department of Transportation do? </li></ul>
  5. 5. A Day in the Life of a Wireless User: Home <ul><li>Wireless data communication has been the driving force in the 21 st century </li></ul><ul><li>Hotspots : Locations where wireless data services are available </li></ul><ul><ul><li>World-Wide growth rate: 350% a year </li></ul></ul><ul><ul><li>By 2007 revenue from hotspots will exceed $9 billion. </li></ul></ul><ul><li>Wireless local area network (WLAN): Essentially identical to standard local area network (LAN) </li></ul><ul><ul><li>Compare Ethernet LAN devices to Wireless LAN devices </li></ul></ul><ul><ul><li>Except devices not connected by wires </li></ul></ul><ul><ul><li>Can increase productivity (By how much?) </li></ul></ul><ul><li>How do you use wireless at home? </li></ul>
  6. 6. A Day in the Life of a Wireless User: Car <ul><li>Bluetooth wireless standard: Enables short range wireless communication </li></ul><ul><ul><li>Used in many small devices </li></ul></ul><ul><li>How is Bluetooth used in a car ? </li></ul><ul><li>Bluetooth on the Road. </li></ul>
  7. 7. A Day in the Life of a Wireless User: Office <ul><li>Fixed broadband wireless: Wireless transmissions between immobile devices </li></ul><ul><ul><li>Typically between office buildings </li></ul></ul><ul><ul><li>Utilizes small, customized antennas </li></ul></ul><ul><ul><li>Otherwise known as WiMax </li></ul></ul><ul><li>Free space optics (FSO): Alternative to high-speed fiber optic transmissions </li></ul>
  8. 8. A Day in the Life of a Wireless User: Field <ul><li>Handheld devices used to connect to nearest cell tower </li></ul><ul><ul><li>Cell tower connects to local telephone company </li></ul></ul><ul><ul><li>Telephone company connects to appropriate resources </li></ul></ul><ul><ul><ul><li>Such as e-mail servers </li></ul></ul></ul>
  9. 9. A Day in the Life of a Wireless User: On Site <ul><li>Radio frequency identification (RFID) tags: </li></ul><ul><ul><li>“Electronic barcodes” </li></ul></ul><ul><ul><li>Used to identify items </li></ul></ul><ul><ul><li>Can be read if anywhere within range of transmitted radio signal </li></ul></ul><ul><ul><ul><li>Depending on device </li></ul></ul></ul>
  10. 10. A Look at Wireless Technologies <ul><li>Wireless technology woven throughout many aspects of life </li></ul><ul><li>Useful to get overview of some current technologies in today’s wireless world </li></ul>
  11. 11. Wireless Local Area Networks (WLANs) <ul><li>Wi-Fi (Wireless Fidelity): Based on standard that transmits at up to 11 Mbps </li></ul><ul><li>Computers on WLAN must have wireless network interface cards (wireless NIC or Wireless adapter) </li></ul><ul><ul><li>Performs same basic functions as standard NIC, plus more </li></ul></ul><ul><li>Access point (AP): Transfers signals between wireless NICs </li></ul><ul><li>Patch cable connects AP to wired LAN or Internet </li></ul>
  12. 12. Wireless Local Area Networks (continued) Wireless LAN
  13. 13. Wireless Local Area Networks (continued) Home wireless LAN
  14. 14. Bluetooth <ul><li>Low-power wireless data and voice transmission technology </li></ul><ul><li>Bluetooth devices communicate via radio modules </li></ul><ul><ul><li>Link manager: Software that helps identify other Bluetooth devices, creates links between devices, and sends and receives data </li></ul></ul><ul><li>Transmit data at up to 1 Mbps over 10 meters </li></ul><ul><li>Bluetooth devices within range of each other automatically connect </li></ul><ul><ul><li>Master and slave </li></ul></ul><ul><li>Piconet: Bluetooth network containing a master and at least one slave </li></ul>
  15. 15. Telecommunications Links <ul><li>Integrated Services Digital Networks (ISDN): Transmits at 256 Kbps </li></ul><ul><li>T-1 lines: Transmit at 1.544 Mbps </li></ul><ul><li>Cable modems: Use television cable connection </li></ul><ul><li>Digital subscriber lines (DSL): Use telephone lines </li></ul><ul><li>WiMax: Signal transmitted between antennas </li></ul><ul><ul><li>Up to 75 Mbps and over up to 35 miles </li></ul></ul><ul><ul><li>Fixed Broadband </li></ul></ul>
  16. 16. Telecommunications Links (continued) <ul><li>FSO: Transmit at speeds up to 1.25 Gbps over up to 4 miles </li></ul><ul><ul><li>Line-of-site transmission </li></ul></ul>Free space optics transceiver
  17. 17. Telecommunications Links (continued) Wireless office technologies
  18. 18. Cellular Telephony <ul><li>Global Systems for Mobile (GSM) communications technology: Coverage includes most of US and parts of Europe and Japan </li></ul><ul><ul><li>Transmission speeds up to 9.6 Kbps </li></ul></ul><ul><ul><li>Information transmitted based on Wireless Application Protocol (WAP) </li></ul></ul><ul><ul><ul><li>Standard way to transmit, format, and display data for devices like cell phones and handheld devices </li></ul></ul></ul>
  19. 19. Cellular Telephony (continued) <ul><li>WAP cell phone runs a microbrowser that uses Wireless Markup Language (WML) instead of HTML </li></ul><ul><li>WAP gateway or proxy: Translates between WML and HTML </li></ul>WAP communications
  20. 20. Radio Frequency Identification (RFID) <ul><li>Like an electronic barcode: </li></ul><ul><ul><li>Can contain larger amounts of updatable information </li></ul></ul><ul><ul><li>Information transmitted via radio waves </li></ul></ul><ul><ul><li>Range typically about 1 foot at 5 Mbps </li></ul></ul>RFID tag http://news.bbc.co.uk/2/hi/science/nature/4545252.stm
  21. 21. Wireless Technology Categories Typical wireless technologies
  22. 22. Wireless LAN Applications: Education <ul><li>Educational institutions some of first adopters of WLANs </li></ul><ul><ul><li>Dramatic advantages in teaching and learning </li></ul></ul><ul><li>Wireless LAN connections offer students important degree of freedom </li></ul><ul><li>WLAN technology translates into cost savings for colleges </li></ul><ul><ul><li>Reduces need for wiring and infrastructure </li></ul></ul><ul><ul><li>Fewer computer labs necessary </li></ul></ul>
  23. 23. Wireless LAN Applications: Education (continued) Campus access point locations
  24. 24. Wireless LAN Applications: Business <ul><li>Wireless LAN technologies have significantly changed how business conducted </li></ul><ul><ul><li>Meetings not confined to conference rooms </li></ul></ul><ul><ul><li>Easier to connect to network resources and Internet </li></ul></ul><ul><ul><li>Can create office in space where traditional infrastructure does not exist </li></ul></ul>
  25. 25. Wireless LAN Applications: Travel <ul><li>Travel industry perhaps adopted wireless technologies more than any other industry </li></ul><ul><ul><li>Many airport terminals provide wireless hotspots </li></ul></ul><ul><ul><li>Several large airlines providing wireless capabilities to passengers during flights </li></ul></ul><ul><ul><li>Some airlines use WLAN technology to communicate with aircraft on ground </li></ul></ul><ul><ul><li>Some airlines use WLAN technology to facilitate maintenance tasks </li></ul></ul><ul><ul><li>Some airlines use new wireless data service to send and receive messages </li></ul></ul>
  26. 26. Wireless LAN Applications: Construction <ul><li>Wireless technology has greatly benefited construction industry </li></ul><ul><ul><li>Better management of resources </li></ul></ul><ul><ul><li>Better management of paperwork </li></ul></ul><ul><li>Construction equipment being fitted with wireless terminals </li></ul><ul><ul><li>“Smart” equipment </li></ul></ul><ul><ul><li>GPS information can provide location information to within centimeters </li></ul></ul>
  27. 27. Wireless LAN Applications: Warehouse Management <ul><li>New products arrive continuously </li></ul><ul><ul><li>Must be inventoried and stored </li></ul></ul><ul><li>Products being shipped must first be located then transferred to correct location and truck </li></ul><ul><ul><li>Mistakes in inventory or inability to locate items can be devastating </li></ul></ul><ul><ul><li>Mark inventory with RFID tags </li></ul></ul><ul><li>Warehouse management system (WMS) software: Can manage all activities from receiving through shipping </li></ul><ul><ul><li>Utilize wireless technology </li></ul></ul>
  28. 28. Wireless LAN Applications: Public Safety <ul><li>Public safety departments using WLANs and GSM to communicate information with public safety vehicles </li></ul><ul><ul><li>City-owned buildings equipped with APs </li></ul></ul><ul><ul><li>Large volumes of data can be quickly downloaded to vehicles </li></ul></ul><ul><ul><ul><li>e.g., building floor plans, photographs of criminal suspects, and maps </li></ul></ul></ul>
  29. 29. Wireless LAN Applications: Healthcare <ul><li>Wireless LAN point-of-care computer systems allow medical staff to access and update patient records immediately </li></ul><ul><ul><li>Document patient’s medication administration immediately </li></ul></ul><ul><ul><li>Extensive use of RFID tags </li></ul></ul><ul><ul><ul><li>Identify healthcare professionals, patients, medications </li></ul></ul></ul><ul><ul><li>System verifies that medication being administered to correct patient in correct dosage </li></ul></ul><ul><ul><ul><li>Eliminates potential errors and documentation inefficiencies </li></ul></ul></ul>
  30. 30. Wireless LAN Applications: Healthcare (continued) <ul><li>Documentation process takes place at bedside where care delivered </li></ul><ul><ul><li>Improves accuracy </li></ul></ul><ul><li>Hospital personnel have real-time access to latest medication and patient status information </li></ul><ul><li>Wireless technology also used in other medical areas: </li></ul><ul><ul><li>e.g., video pills </li></ul></ul>
  31. 31. Wireless LAN Applications: Healthcare (continued) Video pill
  32. 32. Wireless Advantages and Disadvantages: Advantages <ul><li>Mobility: Primary advantage of wireless technology </li></ul><ul><ul><li>Enables individuals to use devices no matter where users roam within range of network </li></ul></ul><ul><ul><li>Increasingly mobile workforce is characteristic of today’s business world </li></ul></ul><ul><ul><li>WLANs give mobile workers freedom while allowing them to access network resources </li></ul></ul><ul><ul><li>“Flatter” organizations: WLANs give team-based workers ability to access network resources needed while collaborating in team environment </li></ul></ul>
  33. 33. Wireless Advantages and Disadvantages: Advantages (continued) <ul><li>Easier and Less Expensive Installation: Installing network cabling in older buildings difficult and costly </li></ul><ul><ul><li>Wireless LAN is ideal solution </li></ul></ul><ul><ul><li>Eliminating need for cabling results in cost savings </li></ul></ul><ul><ul><ul><li>Significant time savings as well </li></ul></ul></ul><ul><ul><li>Allows offices to reorganize easily </li></ul></ul><ul><li>Increased Reliability: Wireless LAN technology eliminates certain types of cable failures and increases overall network reliability </li></ul>
  34. 34. Wireless Advantages and Disadvantages: Advantages (continued) <ul><li>Disaster Recovery: Documented disaster recovery plan vital to every business </li></ul><ul><ul><li>Hot site: Off-site facility that can run business’s operations if primary site is not available </li></ul></ul><ul><ul><ul><li>Generally maintained by third party </li></ul></ul></ul><ul><ul><ul><li>Expensive </li></ul></ul></ul><ul><ul><li>Cold site: Customer provides and installs equipment </li></ul></ul><ul><ul><ul><li>Many businesses use cold sites and WLANs as major piece of disaster recovery plan </li></ul></ul></ul><ul><ul><ul><ul><li>No consideration given to network cabling </li></ul></ul></ul></ul>
  35. 35. Wireless Advantages and Disadvantages: Disadvantages <ul><li>Security: Wireless signals broadcast in open air </li></ul><ul><ul><li>Security for wireless LANs is prime concern </li></ul></ul><ul><ul><ul><li>Unauthorized users might access network </li></ul></ul></ul><ul><ul><ul><ul><li>War driving </li></ul></ul></ul></ul><ul><ul><ul><li>Attackers might view transmitted data </li></ul></ul></ul><ul><ul><ul><li>Employees could install rogue access points </li></ul></ul></ul><ul><ul><ul><li>Attackers could easily crack existing wireless security </li></ul></ul></ul><ul><ul><ul><ul><li>Older wireless products have very weak security features </li></ul></ul></ul></ul>
  36. 36. Wireless Advantages and Disadvantages: Disadvantages (continued) <ul><li>Radio Signal Interference: Signals from other devices can disrupt wireless transmissions </li></ul><ul><ul><li>Or wireless device may be source of interference for other devices </li></ul></ul><ul><ul><li>e.g., Microwave ovens, elevator motors, photocopying machines, theft protection devices, cordless telephones </li></ul></ul><ul><ul><li>Solution: Locate source of interference and remove </li></ul></ul><ul><li>Health Risks: Wireless devices emit RF energy </li></ul><ul><ul><li>Not known if or to what extent low levels of RF might cause adverse health effects </li></ul></ul>
  37. 37. Summary <ul><li>Wireless devices and technologies enable users to roam almost anywhere and remain connected to data and voice networks </li></ul><ul><li>A WLAN, also known as Wi-Fi, functions the same as a standard wired network except devices send radio frequency signals through the air instead of being connected to the network by cabling </li></ul><ul><li>Bluetooth devices communicate using small radio transceivers called radio modules that are built into microprocessor chips </li></ul>
  38. 38. Summary (continued) <ul><li>Two popular technologies are WiMax and free space optics (FSO) </li></ul><ul><li>Handheld devices can send and receive wireless signals using the Global System for Mobile (GSM) communications technology </li></ul><ul><li>RFID tags function as electronic barcodes </li></ul><ul><li>Wireless personal area networks (WPANs) cover technologies where the transmission generally extends only a few meters or feet, whereas wireless local area networks (WLANs) are generally restricted to 112 meters (375 feet) </li></ul>
  39. 39. Summary (continued) <ul><li>Wireless LAN applications can be found in industries in which employees need the freedom to conduct business without being confined to a specific location </li></ul><ul><li>Wireless LANs have significant advantages, including increased mobility, easier and less expensive network installations, increased network reliability, and disaster recovery </li></ul><ul><li>Some of the disadvantages of wireless LANs include security, radio signal interference, and health concerns </li></ul>
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