CWNA Certified Wireless Network Administrator

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CWNACertified Wireless Network Administrator

• Introduction to Wireless LANs

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The Wireless LAN Market

• Wireless local area network (WLAN) market.
• Expected to reach US4.6 billion by 2005.
• WLAN product shipments should increase by over
  US600 million per year from 2001 to 2005.
• The 802.11b products have been especially
  successful in penetrating the education,
  hospitality, healthcare and financial
  environments.

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History of Wireless LANs

• 1830 Professor Joseph Henry transmitted the
  first practical electrical signal.
• 1969 The Advanced Research Projects Agency
  Network (ARPANET) of the U.S. DoD was the world's
  first operational packet Switched network.

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History of Wireless LANs

• 1970 ALOHAnet was developed at the University
  of Hawaii.
• First wireless packet-switched network.
• First network to connect to the ARPANET in 1972.
• Star topology using 9600 Baud modems.
• Shared signal system using carrier sense multiple
  access.
• The ALOHAnet used two 100 kHz "channels" at
  407.350 MHz and 413.475 MHz.

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History of Wireless LANs

• 1985 Federal Communication Commission (FCC).
  Authorized license-free spread spectrum wireless
  equipment in three ISM bands.
• 900 MHz band, (900 to 928 MHz range)
• 2.4 GHz band, (2.4 to 2.483 GHz range)
• 5 GHz band, (5.725 to 5.850 GHz range)

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History of Wireless LANs

• 1997 Federal Communication Commission (FCC).
  Authorized license-free spread spectrum wireless
  equipment in three U-NII bands.
• 5.15 to 5.25 GHz
• 5.25 to 5.35 GHz
• 5.725 to 5.825 GHz

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Todays Wireless LAN Standards

• 1865 The International Telecommunication Union.
• Radiocommunication (ITU-R)
• Telecommunication Standardization (ITU-T)
• Telecommunication Development (ITU-D)

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Todays Wireless LAN Standards

• 1934 The Federal Communications Commission (FCC)
  is an independent United States government
  agency.
• FCC is charged with regulating interstate and
  international communications by radio,
  television, wire, satellite and cable.

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Todays Wireless LAN Standards

• Institute of Electrical and Electronics
  Engineers, Inc., IEEE, (Eye-triple-E).
• IEEE is non-profit, technical professional
  association of more than 380,000 individual
  members in 150 countries.
• IEEE has nearly 900 active standards with 700
  under development.

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Todays Wireless LAN Standards

• 1999 The Wi-Fi Alliance is a nonprofit
  international association formed to certify
  interoperability of wireless Local Area Network
  products based on IEEE 802.11 specification.
• 210 member companies from around the world
• 865 products have received Wi-Fi certification.
• The goal of the Wi-Fi Alliance's members is to
  enhance the user experience through product
  interoperability.

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Todays Wireless LAN Standards

• 1997 IEEE 802.11
• Original wireless LAN standard
• Up to 2Mbps in the 2.4GHz band
• Modulation FHSS or DSSS
• Security WEP WPA
• Compatible with b and g

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Todays Wireless LAN Standards

• 1999 IEEE 802.11b
• Up to 11Mbps in the 2.4GHz band
• Modulation DSSS with CCK
• Security WEP WPA
• Wi-Fi Certified
• Compatible with 802.11 and g

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Todays Wireless LAN Standards

• 1999 IEEE 802.11a
• Up to 54Mbps in the 5GHz band
• Modulation OFDM
• Security WEP WPA
• Wi-Fi Certified
• Not Compatible with 802.11, b and g

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Todays Wireless LAN Standards

• 2003 IEEE 802.11g
• Up to 54Mbps in the 2.4GHz band
• Modulation OFDM above 20Mbps, DSSS with CCK
  below 20Mbps
• Security WEP WPA
• Wi-Fi Certified
• Compatible with 802.11 and b

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Todays Wireless LAN Standards

• 1998 Bluetooth
• Up to 2Mbps in the 2.45GHz
• Modulation FHSS
• Security PPTP, SSL or VPN
• The Infrared Data Association, IrDA, is a
  nonprofit organization whose goal is to develop
  globally adopted specifications for infrared
  wireless communication.

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Three-Tier Network Design Model

• A hierarchical network design model described by
  Cisco Systems, Inc.

Core Layer
Distribution Layer
Access Layer
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Access Layer

• Access Layer
• The layer in which users connect to the rest of
  the network. The access layer usually includes a
  relatively large number of low- to medium-speed
  access ports. This is the layer where many
  wireless devices and protocols reside.

Access Layer
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Access Role
Admin Host
Network Server
Network Printer
Wired Network
Access Point
Clients
Wireless Network
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Distribution Layer

• The Distribution Layer distributes network
  traffic between related access layers, it is
  often the layer in which you define subnets. For
  wireless think bridging.

Distribution Layer
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Distribution Role
Point-to-Point Links
Antenna 2
Transmission Path
Antenna 1
Building 2
Building 1
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Core Layer

• The Core Layer facilitates the efficient
  transfer of data between interconnected
  distribution layers. The core layer typically
  functions as the high-speed backbone of the
  enterprise network.

Core Layer
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Core Role
Admin Host
Network Server
Network Printer
Access Point
Network Core
Poor Speed and Resiliency
Clients
Wireless Network
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Network Extension
Third Floor
Second Floor
Access Point
First Floor
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Last Mile Data Delivery
Hot Spot
Shopping Mall
WISP Antenna
Residential Homes
WISP Antenna
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Mobility
Network Server
Wired Network
Access Point
Roaming
Warehouse
Sales Office
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Small Office Home Office
Access Point
Laptop
Workstation
Internet Connection
Wall or Divider
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Mobile Office
Point-to-Multipoint Links
Main Building
Campus
Portables
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Summary

• Wireless Networking History
• Advances in Wireless Networking
• Reduced costs and increased availability
• FCC, IEEE, WI-FI Alliance
• IEEE 802.11, 802.11a, 802.11b, 802.11g
• Wireless Networking Core, Distribution and
  Access Layers
• WISP