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Components Review

Components Review. WLAN Devices. In-building Infrastructure 1200 Series (802.11a and 802.11b) 1100 Series (802.11b) 350 Series (802.11b) not shown. Bridging 350 Series (802.11b) BR350 WGB350 1400 Series (802.11a). Antennas. Antenna 2.4GHz Antennas 5 GHz Antennas.

cameran-barrett
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Components Review

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  1. Components Review

  2. WLAN Devices In-building Infrastructure • 1200 Series (802.11a and 802.11b) • 1100 Series (802.11b) • 350 Series (802.11b) not shown Bridging • 350 Series (802.11b) • BR350 • WGB350 • 1400 Series (802.11a) CWNA Guide to Wireless LANs, Second Edition

  3. Antennas Antenna • 2.4GHz Antennas • 5 GHz Antennas CWNA Guide to Wireless LANs, Second Edition

  4. Cable, Accessories, Wireless IP Phone Cable and Accessories • Low Loss Cable • Antenna Mounts • Lightening Arrestor • Wireless IP Phone CWNA Guide to Wireless LANs, Second Edition

  5. Client Adapters Clients (NICs) • 350 Series (802.11b) • 5 GHz client adapter (802.11a) Drivers are supported for all popular operating systems, including Windows 95, 98, NT 4.0, Windows 2000, Windows ME, Windows XP, Mac OS Version 9.x, and Linux. CWNA Guide to Wireless LANs, Second Edition

  6. Cisco Aironet 350 Series Mini PCI Adapter • 2.4 GHz/802.11b embedded wireless for notebooks • 100 mW transmit power • Must order through PC manufactures (not orderable directly through Cisco) CWNA Guide to Wireless LANs, Second Edition

  7. Cisco Aironet 1100 Series Access Point • Aironet 1100 supports 802.11b • 802.11b is upgradeable to 802.11g with a mini-PCI replacement. CWNA Guide to Wireless LANs, Second Edition

  8. 1200 Series Access Point • An access point (AP) acts as the center point of a stand-alone wireless network or as the connection point between wireless and wired networks. • May provide roaming functionality with multiple APs. • Aironet 1200 is a dual-band AP that supports both 802.11b and 802.11a. • 802.11b is upgradeable to 802.11g with a mini-PCI replacement. CWNA Guide to Wireless LANs, Second Edition

  9. Cisco Aironet WLAN Solutions for the Enterprise CWNA Guide to Wireless LANs, Second Edition

  10. Bridges – BR350 • BR350 is designed to connect two or more networks, typically located in different buildings. • The BR350 wireless bridges provide up to 11 Mbps speed. • The bridge is ideal for indoor or outdoor installations subject to plenum rating and harsh environments. CWNA Guide to Wireless LANs, Second Edition

  11. Bridges – WGB350 • Cisco Aironet 350 Series Workgroup Bridge (WGB350) quickly connects up to eight Ethernet-enabled laptops or other portable computers to a wireless WLAN, providing an 11 Mbps link from these devices to any Cisco Aironet 802.11b AP or Wireless Bridge. • This bridge is for indoor use only. CWNA Guide to Wireless LANs, Second Edition

  12. Bridges – 1400 • Cisco Aironet 1400 Series Bridge operates at speeds up to 54 Mbps. • High-performance 801.11a wireless bridge designed to connect multiple LANs in a metro area. • The 1400 can only operate outdoors in a fixed point-to-point or point-to-multipoint application. CWNA Guide to Wireless LANs, Second Edition

  13. Cisco Aironet Wireless Bridging Solutions CWNA Guide to Wireless LANs, Second Edition

  14. Antennas • A variety of optional 2.4 GHz and 5 GHz antennas are available for Cisco wireless devices. Antennas should be chosen carefully to ensure that optimum range and coverage is obtained • Coupling the right antenna with the right AP allows for efficient coverage in any facility, as well as better reliability at higher data rates. • A detailed coverage of antennas will be provided later in the course. CWNA Guide to Wireless LANs, Second Edition

  15. Antennas • Indoor and Outdoor • WLAN and Bridging • Outdoor • Bridging • 2.4 GHz • 5 GHz CWNA Guide to Wireless LANs, Second Edition

  16. Beyond Laptops:Other 802.11-Enabled Devices Epson Printer HP iPAQ 5450 PDA • PDA’s • Phones • Printers • Projectors • Tablet PC’s • Security Cameras • Barcode scanners • Custom devices for vertical markets: • Healthcare • Manufacturing • Retail • Restaurants Compaq Tablet PC SpectraLink Phone HHP Barcode Scanner Sharp M25X Projector CWNA Guide to Wireless LANs, Second Edition

  17. “Business-Class”vs Consumer WLAN • Industry has segmented: consumer vs. business • “Cisco” offers only “business-class” products: • Security • Upgradeability • Network management • Advanced features • Choice of antennas • Highest throughput • Scalability

  18. Consumer wireless products • There is a real difference in functionality and administrative capabilities between Business-class and Consumer wireless products. CWNA Guide to Wireless LANs, Second Edition

  19. Wireless LAN Topologies CWNA Guide to Wireless LANs, Second Edition

  20. Wireless LAN Topologies • Without a wireless alternative, organizations frequently resort to wide area networking (WAN) technologies to link together separate facilities. • Contracting for leased-line or other wide-area services often presents a variety of drawbacks: • Installation is typically expensive and rarely immediate • Monthly fees are often quite high for bandwidth • A wireless bridge can typically be purchased and installed in a day with no recurring charges. CWNA Guide to Wireless LANs, Second Edition

  21. Wireless LAN Market

  22. Implications • Over the last decade, the networking and wireless communities expected each year to become the year of the WLAN. • WLAN technology had some false starts in the 1990s, for a variety of reasons. Immature technology, security concerns, and slow connectivity speeds kept WLAN technology from becoming a viable alternative to wired LANs. CWNA Guide to Wireless LANs, Second Edition

  23. WLAN growth and applications Don’t know the source of this and there is considerable debate whether 802.11a will win out over 802.11b/g CWNA Guide to Wireless LANs, Second Edition

  24. Momentum is Building in Wireless LANs • Wireless LANs are an “addictive” technology • Strong commitment to Wireless LANs by technology heavy-weights • Cisco, IBM, Intel, Microsoft • Embedded market is growing • Laptop PC’s with “wireless inside” • PDA’s are next • The WLAN market is expanding from Industry-Specific Applications, to Universities, Homes, & Offices • Professional installers and technicians will be in demand CWNA Guide to Wireless LANs, Second Edition

  25. Wireless LANs Are Taking Off Future Growth Due To: • Standards • High Bandwidth Needs • Low Cost • Embedded in Laptops • Variety of Devices • Voice + Data • Multiple Applications • Security Issues Solved • Ease of Deployment • Network Mgmt. Tools • Enterprise Adoption Worldwide WLAN Market *includes embedded clients, add-on client cards, & infrastructure equipment for both the business and consumer segments ($ Billions) CAGR = 43% Source: Forward Concepts, 2003 CWNA Guide to Wireless LANs, Second Edition

  26. Four main requirements for a WLAN solution • High availability — High availability is achieved through system redundancy and proper coverage-area design. • Scalability — Scalability is accomplished by supporting multiple APs per coverage area, which use multiple frequencies. APs can also perform load balancing, if desired. • Manageability — Diagnostic tools represent a large portion of management within WLANs. Customers should be able to manage WLAN devices through industry standard APIs, including SNMP and Web, or through major enterprise management applications like CiscoWorks 2000, Cisco Stack Manager, and Cisco Resource Monitor. • Open architecture — Openness is achieved through adherence to standards such as 802.11a and 802.11b, participation in interoperability associations such as the Wi-Fi Alliance, and certification such as U.S. FCC certification. CWNA Guide to Wireless LANs, Second Edition

  27. Other requirements • Security — It is essential to encrypt data packets transmitted through the air. For larger installations, centralized user authentication and centralized management of encryption keys are also required. • Cost — Customers expect continued reductions in price of 15 to 30 percent each year, and increases in performance and security. Customers are concerned not only with purchase price but also with total cost of ownership (TCO), including costs for installation. CWNA Guide to Wireless LANs, Second Edition

  28. Challenges and Issues

  29. Radio Signal Interference • Network managers must ensure that different channels are utilized. • Interference cannot always be detected until the link is actually implemented. • Because the 802.11 standards use unlicensed spectrum, changing channels is the best way to avoid interference. • If someone installs a link that interferes with a wireless link, the interference is probably mutual. CWNA Guide to Wireless LANs, Second Edition

  30. Radio Signal Interference • Many other devices such as portable phones, microwave ovens, wireless speakers, and security devices, also use these frequencies. • It is possible for electromagnetic interference (EMI) to be generated by non-radio equipment operating in close proximity to the Cisco Aironet WLAN equipment. • While it is theoretically possible for this interference to directly affect the reception and transmission of signals, it is more likely to affect the components of the transmitter. • To minimize the possible effects of EMI, the best course of action is to isolate the radio equipment from potential sources of EMI. CWNA Guide to Wireless LANs, Second Edition

  31. Power Consumption • Power consumption is always an issue with laptops, because the power and the battery have limited lives. • 802.11a uses a higher frequency (5 GHz) than 802.11a/g (2.4 GHz) which requires higher power and more of a drain on batteries. CWNA Guide to Wireless LANs, Second Edition

  32. Interoperability • Non-standard (for now) 802.11 devices include: • Repeater APs • Universal Clients (Workgroup Bridges) • Wireless Bridges • Cisco bridges, like many other vendor bridges, are proprietary implementations of the 802.11 standard and therefore vendor interoperability cannot be attained. CWNA Guide to Wireless LANs, Second Edition

  33. Wireless LAN Security: Lessons “War Driving” Hacking into WEP Lessons: • Security must be turned on (part of the installation process) • Employees will install WLAN equipment on their own (compromises security of your entire network) • WEP keys can be easily broken (businesses need better security) CWNA Guide to Wireless LANs, Second Edition

  34. Wireless LAN Security • Security in the IEEE 802.11 specification—which applies to 802.11b, 802.11a, and 802.11g—has come under intense scrutiny. • Researchers have exposed several vulnerabilities. • As wireless networks grow, the threat of intruders from the inside and outside is great. • Attackers called “war drivers” are continually driving around searching for insecure WLANs to exploit. CWNA Guide to Wireless LANs, Second Edition

  35. Wireless LAN Security • The IEEE enhanced Wired Equivalent Privacy (WEP) with Temporal Key Integrity Protocol (TKIP) which provides robust authentication options with 802.1x to make 802.11-based wireless LANs secure. • We will also look at WPA (WiFi Protected Access, TKIP + MIC) • At the same time, the IEEE is looking for stronger encryption mechanisms. • The IEEE has adopted the use of the Advanced Encryption Standard (AES) to the data-privacy section of the proposed 802.11i standard. CWNA Guide to Wireless LANs, Second Edition

  36. Reliability and Connectivity • Wireless LANs include mechanisms to improve the reliability of the packet transmissions to be at least the same level as wired Ethernet. • Using the TCP/IP protocols will help protect the network against any loss or corruption of data over the air. • Most WLAN systems use spread-spectrum technology or orthogonal frequency-division multiplexing (OFDM).We will look at these in much more detail later. • Too much to go into right now. CWNA Guide to Wireless LANs, Second Edition

  37. Installation and Site Design Issues—Bridging CWNA Guide to Wireless LANs, Second Edition

  38. Installation and Site Design Issues—WLAN CWNA Guide to Wireless LANs, Second Edition

  39. Health Issues CWNA Guide to Wireless LANs, Second Edition

  40. IEEE 802.11 Standards Activities • 802.11a: 5GHz, 54Mbps • 802.11b: 2.4GHz, 11Mbps • 802.11d: Multiple regulatory domains • 802.11e: Quality of Service (QoS) • 802.11f: Inter-Access Point Protocol (IAPP) • 802.11g: 2.4GHz, 54Mbps • 802.11h: Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) • 802.11i: Security • 802.11j: Japan 5GHz Channels (4.9-5.1 GHz) • 802.11k: Measurement CWNA Guide to Wireless LANs, Second Edition

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