Wireless notes for special class

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  • 1. Learning Objectives • Define and describe WLANs • Describe the need and benefits of WLANs. Module 1 • Identify characteristics of Cisco Aironet 802.11a/b/g products. Introduction to Wireless LANs © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-1 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-2 What is WLAN? Benefits of WLANs 1. WLAN use a transmission medium just like wired LANs. 2. Use infrared Light (IR) or Radio Frequency (RF). • RF - more popular - Longer range - Higher bandwidth - Wider coverage 3. It use 2.4GHz and 5 GHz frequency bands. 4. Wireless networking provides – freedom and flexibility to operate within or between buildings. © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-3 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-4Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 2. Unlicensed Frequency Bands Wireless Technologies WAN (Wide Area Network) MAN (Metropolitan Area Network) LAN (Local Area Network) PAN (Personal Area Network) PAN LAN MAN WAN 802.11a, 11b, 11g 802.11 GSM, GPRS, Standards Bluetooth HiperLAN2 MMDS, LMDS CDMA, 2.5–3G Speed <1 Mbps 2–54+ Mbps 22+ Mbps 10–384 Kbps Range Short Medium Medium–Long Long PDAs, Mobile Peer-to-Peer Enterprise Fixed, Last Applications Device-to-Device Networks Mile Access Phones, Cellular Access © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-5 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-6 Wireless Technologies WLAN Evolution: 2000–Present Warehousing Retail Healthcare Education Businesses Home Speed 860 Kbps 1 and 2 Mbps 1 and 2 Mbps 11 Mbps 54 Mbps Network Proprietary Standards-based Radio 900 MHz 2.4 GHz 2.4 GHz 5 GHz IEEE 802.11Begins 802.11 802.11a,b 802.11g Drafting Ratified Ratified Drafted 1986 1988 1990 1992 1994 1996 1998 2000 2002 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-7 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-8Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 3. WLAN Devices In-building Infrastructure Bridging • 1200 Series (802.11a and 802.11b) • 350 Series (802.11b) • 1100 Series (802.11b) •BR350 • 350 Series (802.11b) not shown •WGB350 • 1400 Series (802.11a) Components and Topologies © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-9 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-10 WLAN Devices Cable, Accessories, Wireless IP Phone Clients Cable and Accessories Antenna • 350 Series (802.11b) • Low Loss Cable •2.4GHz • 5 GHz client adapter (802.11a) • Antenna Mounts •5 GHz Antennas • Workgroup bridge (802.11b) • Lightening Arrestor • Wireless IP Phone © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-11 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-12Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 4. Cisco Aironet 802.11b Client Adapters Cisco Aironet 802.11a Client Adapter 5 GHz/802.11a 2.4 GHz • 54 Mbps • 802.11b Rate Shifting • 11 Mbps • 6, 9, 12, 18, 24, 36, 48, or 54 Include Fixed data rates • PC Card • User configurable option • PCI Card 5 dBi Patch Antenna • LMC Card CardBus interface Transmit power settings: • Mini PCI • 20 mW, 10 mW, and 5 mW © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-13 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-14 1200 Series Access Point Cisco Aironet 1100 Series Access Point Dual radio design Field upgradable radio and software Single 802.11b radio – 802.11b radio • Time-tested technology • 100 mW radio • Supports installed client-base • Built-in RP-TNC connectors for Upgradable diversity • Migration path to 802.11g for further investment • Wide range of Cisco 2.4 GHz return antennas offered Scalable – 802.11a radio • Fully functional access point ideal for all enterprise • Delivers up to 54 Mbps, the deployments without expensive controllers next generation of performance Affordable • Can run in dual mode capacity • Lowest priced upgradable Cisco Aironet access with the 802.11b radio point • Innovative antenna design to Enterprise-class features fit deployment needs • End-to-end intelligent networking and security Enterprise-class management and extended to WLAN security © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-15 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-16Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 5. Cisco Aironet 1400 Series Antennas High Performance •Indoor and Outdoor • Outdoor •Industry leading throughput and range •WLAN and Bridging • Bridging Easy-to-Use •Out of the box installation in outdoor 2.4 GHz 5 GHz environment Flexible •Point to point and point to multi-point bridging •Multiple mounting and antenna options Secure •Enterprise-class security Feature Rich •Intelligent Network Services via IOS © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-17 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-18 Cable and Accessories 802.11-Enabled Phones A cordless phone for the workplace •Cisco 7920 Wireless VoIP phone © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-19 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-20Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 6. Beyond Laptops: Other 802.11-Enabled Devices HP iPAQ 5450 PDA Epson Printer PDA’s Phones Printers Projectors Tablet PC’s Compaq Tablet PC Security Cameras Barcode scanners SpectraLink WLAN Market Phone Custom devices for vertical markets: •Healthcare •Manufacturing •Retail •Restaurants HHP Barcode Scanner Sharp M25X Projector © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-21 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-22 In Building WLAN Site to Site WLAN © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-23 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-24Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 7. WLAN Markets Challenges and Issues © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-25 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-26 Radio Signal Interference Power Consumption © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-27 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-28Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 8. Wireless LAN Security: Interoperability 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) © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-29 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-30 Installation and Site Design Issues— Reliability and Connectivity Bridging © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-31 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-32Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr
  • 9. Installation and Site Design Issues—WLAN Health Issues © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-33 © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-34 Let’s Have you own WLAN! © 2003, Cisco Systems, Inc. All rights reserved. FWL 1.0—1-35Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA.Presentation_ID.scr