Wireless notes for special class
description
Transcript of Wireless notes for special class
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Module 1
Introduction to Wireless LANs
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Learning Objectives
• Define and describe WLANs
• Describe the need and benefits of WLANs.
• Identify characteristics of Cisco Aironet 802.11a/b/g products.
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What is WLAN?
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.
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Benefits of WLANs
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Unlicensed Frequency Bands
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Wireless Technologies
PAN(Personal Area
Network)
PAN(Personal Area
Network)
LAN(Local Area Network)
LAN(Local Area Network)
WAN(Wide Area Network)
WAN(Wide Area Network)
MAN(Metropolitan Area Network)
MAN(Metropolitan Area Network)
PANPAN LANLAN MANMAN WANWAN
BluetoothBluetooth
Peer-to-PeerDevice-to-Device
Peer-to-PeerDevice-to-Device
ShortShort
<1 Mbps<1 Mbps
802.11a, 11b, 11gHiperLAN2
802.11a, 11b, 11gHiperLAN2
Enterprise Networks
Enterprise Networks
MediumMedium
2–54+ Mbps2–54+ Mbps
802.11MMDS, LMDS
802.11MMDS, LMDS
Fixed, LastMile AccessFixed, Last
Mile Access
Medium–LongMedium–Long
22+ Mbps22+ Mbps
GSM, GPRS,CDMA, 2.5–3GGSM, GPRS,
CDMA, 2.5–3G
PDAs, MobilePhones, Cellular
Access
PDAs, MobilePhones, Cellular
Access
LongLong
10–384 Kbps10–384 Kbps
StandardsStandards
SpeedSpeed
RangeRange
ApplicationsApplications
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Wireless Technologies
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860 Kbps
900 MHz
1 and 2 Mbps
2.4 GHz
Proprietary
WLAN Evolution: 2000–Present
Warehousing
Retail
Healthcare
Education
Businesses
Home
802.11
Ratified
802.11a,b
Ratified
802.11g
Drafted
1986 1988 1990 1992 1994 1996 1998 2000 2002
1 and 2 Mbps
2.4 GHz
11 Mbps 54 Mbps
Standards-based
5 GHzRadio
Network
Speed
� IEEE 802.11Begins Drafting
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Components and Topologies
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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)
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WLAN Devices
Antenna
•2.4GHz
•5 GHz Antennas
Clients
• 350 Series (802.11b)
• 5 GHz client adapter (802.11a)
• Workgroup bridge (802.11b)
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Cable, Accessories, Wireless IP Phone
Cable and Accessories
• Low Loss Cable
• Antenna Mounts
• Lightening Arrestor
• Wireless IP Phone
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Cisco Aironet 802.11b Client Adapters
2.4 GHz
• 802.11b
• 11 Mbps
Include
• PC Card
• PCI Card
• LMC Card
• Mini PCI
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Cisco Aironet 802.11a Client Adapter
5 GHz/802.11a
• 54 Mbps
Rate Shifting
• 6, 9, 12, 18, 24, 36, 48, or 54
Fixed data rates
• User configurable option
5 dBi Patch Antenna
CardBus interface
Transmit power settings:
• 20 mW, 10 mW, and 5 mW
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1200 Series Access Point
Dual radio designField upgradable radio and software
– 802.11b radio
• 100 mW radio
• Built-in RP-TNC connectors for diversity
• Wide range of Cisco 2.4 GHz antennas offered
– 802.11a radio
• Delivers up to 54 Mbps, the next generation of performance
• Can run in dual mode capacity with the 802.11b radio
• Innovative antenna design to fit deployment needs
Enterprise-class management and security
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Cisco Aironet 1100 Series Access Point
Single 802.11b radio• Time-tested technology
• Supports installed client-base
Upgradable• Migration path to 802.11g for further investment
return
Scalable • Fully functional access point ideal for all enterprise
deployments without expensive controllers
Affordable• Lowest priced upgradable Cisco Aironet access
point
Enterprise-class features• End-to-end intelligent networking and security
extended to WLAN
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Cisco Aironet 1400 Series
High Performance•Industry leading throughput and range
Easy-to-Use•Out of the box installation in outdoor 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
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Antennas
2.4 GHz 5 GHz
•Indoor and Outdoor
•WLAN and Bridging
• Outdoor
• Bridging
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Cable and Accessories
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802.11-Enabled Phones
A cordless phone for the workplace
•Cisco 7920 Wireless VoIPphone
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Beyond Laptops:Other 802.11-Enabled Devices
PDA’s
Phones
Printers
Projectors
Tablet PC’s
Security Cameras
Barcode scanners
Custom devices for vertical markets:
•Healthcare
•Manufacturing•Retail•Restaurants
HP iPAQ 5450 PDA
Compaq Tablet PC
HHP Barcode Scanner
Epson Printer
Sharp M25X Projector
SpectraLink
Phone
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WLAN Market
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In Building WLAN
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Site to Site WLAN
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WLAN Markets
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Challenges and Issues
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Radio Signal Interference
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Power Consumption
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Interoperability
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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)
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Reliability and Connectivity
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Installation and Site Design Issues—Bridging
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Installation and Site Design Issues—WLAN
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Health Issues
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Let’s Have you own WLAN!